github.com/riscv/riscv-go@v0.0.0-20200123204226-124ebd6fcc8e/src/cmd/compile/internal/ssa/gen/S390X.rules

// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Lowering arithmetic
(Add64  x y) -> (ADD  x y)
(AddPtr x y) -> (ADD  x y)
(Add32  x y) -> (ADDW  x y)
(Add16  x y) -> (ADDW  x y)
(Add8   x y) -> (ADDW  x y)
(Add32F x y) -> (FADDS x y)
(Add64F x y) -> (FADD x y)

(Sub64  x y) -> (SUB  x y)
(SubPtr x y) -> (SUB  x y)
(Sub32  x y) -> (SUBW  x y)
(Sub16  x y) -> (SUBW  x y)
(Sub8   x y) -> (SUBW  x y)
(Sub32F x y) -> (FSUBS x y)
(Sub64F x y) -> (FSUB x y)

(Mul64  x y) -> (MULLD  x y)
(Mul32  x y) -> (MULLW  x y)
(Mul16  x y) -> (MULLW  x y)
(Mul8   x y) -> (MULLW  x y)
(Mul32F x y) -> (FMULS x y)
(Mul64F x y) -> (FMUL x y)

(Div32F x y) -> (FDIVS x y)
(Div64F x y) -> (FDIV x y)

(Div64  x y) -> (DIVD  x y)
(Div64u x y) -> (DIVDU x y)
// DIVW/DIVWU has a 64-bit dividend and a 32-bit divisor,
// so a sign/zero extension of the dividend is required.
(Div32  x y) -> (DIVW  (MOVWreg x) y)
(Div32u x y) -> (DIVWU (MOVWZreg x) y)
(Div16  x y) -> (DIVW  (MOVHreg x) (MOVHreg y))
(Div16u x y) -> (DIVWU (MOVHZreg x) (MOVHZreg y))
(Div8   x y) -> (DIVW  (MOVBreg x) (MOVBreg y))
(Div8u  x y) -> (DIVWU (MOVBZreg x) (MOVBZreg y))

(Hmul64  x y) -> (MULHD  x y)
(Hmul64u x y) -> (MULHDU x y)
(Hmul32  x y) -> (SRDconst [32] (MULLD (MOVWreg x) (MOVWreg y)))
(Hmul32u x y) -> (SRDconst [32] (MULLD (MOVWZreg x) (MOVWZreg y)))
(Hmul16  x y) -> (SRDconst [16] (MULLW (MOVHreg x) (MOVHreg y)))
(Hmul16u x y) -> (SRDconst [16] (MULLW (MOVHZreg x) (MOVHZreg y)))
(Hmul8   x y) -> (SRDconst [8] (MULLW (MOVBreg x) (MOVBreg y)))
(Hmul8u  x y) -> (SRDconst [8] (MULLW (MOVBZreg x) (MOVBZreg y)))

(Mod64  x y) -> (MODD  x y)
(Mod64u x y) -> (MODDU x y)
// MODW/MODWU has a 64-bit dividend and a 32-bit divisor,
// so a sign/zero extension of the dividend is required.
(Mod32  x y) -> (MODW  (MOVWreg x) y)
(Mod32u x y) -> (MODWU (MOVWZreg x) y)
(Mod16  x y) -> (MODW  (MOVHreg x) (MOVHreg y))
(Mod16u x y) -> (MODWU (MOVHZreg x) (MOVHZreg y))
(Mod8   x y) -> (MODW  (MOVBreg x) (MOVBreg y))
(Mod8u  x y) -> (MODWU (MOVBZreg x) (MOVBZreg y))

(Avg64u <t> x y) -> (ADD (ADD <t> (SRDconst <t> x [1]) (SRDconst <t> y [1])) (ANDconst <t> (AND <t> x y) [1]))

(And64 x y) -> (AND x y)
(And32 x y) -> (ANDW x y)
(And16 x y) -> (ANDW x y)
(And8  x y) -> (ANDW x y)

(Or64 x y) -> (OR x y)
(Or32 x y) -> (ORW x y)
(Or16 x y) -> (ORW x y)
(Or8  x y) -> (ORW x y)

(Xor64 x y) -> (XOR x y)
(Xor32 x y) -> (XORW x y)
(Xor16 x y) -> (XORW x y)
(Xor8  x y) -> (XORW x y)

(Neg64  x) -> (NEG x)
(Neg32  x) -> (NEGW x)
(Neg16  x) -> (NEGW (MOVHreg x))
(Neg8   x) -> (NEGW (MOVBreg x))
(Neg32F x) -> (FNEGS x)
(Neg64F x) -> (FNEG x)

(Com64 x) -> (NOT x)
(Com32 x) -> (NOTW x)
(Com16 x) -> (NOTW x)
(Com8  x) -> (NOTW x)
(NOT x) && true -> (XOR (MOVDconst [-1]) x)
(NOTW x) && true -> (XORWconst [-1] x)

// Lowering boolean ops
(AndB x y) -> (ANDW x y)
(OrB x y) -> (ORW x y)
(Not x) -> (XORWconst [1] x)

// Lowering pointer arithmetic
(OffPtr [off] ptr:(SP)) -> (MOVDaddr [off] ptr)
(OffPtr [off] ptr) && is32Bit(off) -> (ADDconst [off] ptr)
(OffPtr [off] ptr) -> (ADD (MOVDconst [off]) ptr)

// Ctz(x) = 64 - findLeftmostOne((x-1)&^x)
(Ctz64 <t> x) -> (SUB (MOVDconst [64]) (FLOGR (AND <t> (SUBconst <t> [1] x) (NOT <t> x))))
(Ctz32 <t> x) -> (SUB (MOVDconst [64]) (FLOGR (MOVWZreg (ANDW <t> (SUBWconst <t> [1] x) (NOTW <t> x)))))

(Bswap64 x) -> (MOVDBR x)
(Bswap32 x) -> (MOVWBR x)

(Sqrt x) -> (FSQRT x)

// Atomic loads.
(AtomicLoad32 ptr mem) -> (MOVWZatomicload ptr mem)
(AtomicLoad64 ptr mem) -> (MOVDatomicload ptr mem)
(AtomicLoadPtr ptr mem) -> (MOVDatomicload ptr mem)

// Atomic stores.
(AtomicStore32 ptr val mem) -> (MOVWatomicstore ptr val mem)
(AtomicStore64 ptr val mem) -> (MOVDatomicstore ptr val mem)
(AtomicStorePtrNoWB ptr val mem) -> (MOVDatomicstore ptr val mem)

// Atomic adds.
(AtomicAdd32 ptr val mem) -> (AddTupleFirst32 (LAA ptr val mem) val)
(AtomicAdd64 ptr val mem) -> (AddTupleFirst64 (LAAG ptr val mem) val)
(Select0 <t> (AddTupleFirst32 tuple val)) -> (ADDW val (Select0 <t> tuple))
(Select1     (AddTupleFirst32 tuple _  )) -> (Select1 tuple)
(Select0 <t> (AddTupleFirst64 tuple val)) -> (ADD val (Select0 <t> tuple))
(Select1     (AddTupleFirst64 tuple _  )) -> (Select1 tuple)

// Atomic exchanges.
(AtomicExchange32 ptr val mem) -> (LoweredAtomicExchange32 ptr val mem)
(AtomicExchange64 ptr val mem) -> (LoweredAtomicExchange64 ptr val mem)

// Atomic compare and swap.
(AtomicCompareAndSwap32 ptr old new_ mem) -> (LoweredAtomicCas32 ptr old new_ mem)
(AtomicCompareAndSwap64 ptr old new_ mem) -> (LoweredAtomicCas64 ptr old new_ mem)

// Lowering extension
// Note: we always extend to 64 bits even though some ops don't need that many result bits.
(SignExt8to16  x) -> (MOVBreg x)
(SignExt8to32  x) -> (MOVBreg x)
(SignExt8to64  x) -> (MOVBreg x)
(SignExt16to32 x) -> (MOVHreg x)
(SignExt16to64 x) -> (MOVHreg x)
(SignExt32to64 x) -> (MOVWreg x)

(ZeroExt8to16  x) -> (MOVBZreg x)
(ZeroExt8to32  x) -> (MOVBZreg x)
(ZeroExt8to64  x) -> (MOVBZreg x)
(ZeroExt16to32 x) -> (MOVHZreg x)
(ZeroExt16to64 x) -> (MOVHZreg x)
(ZeroExt32to64 x) -> (MOVWZreg x)

(Slicemask <t> x) -> (SRADconst (NEG <t> x) [63])

// Lowering truncation
// Because we ignore high parts of registers, truncates are just copies.
(Trunc16to8  x) -> x
(Trunc32to8  x) -> x
(Trunc32to16 x) -> x
(Trunc64to8  x) -> x
(Trunc64to16 x) -> x
(Trunc64to32 x) -> x

// Lowering float <-> int
(Cvt32to32F x) -> (CEFBRA x)
(Cvt32to64F x) -> (CDFBRA x)
(Cvt64to32F x) -> (CEGBRA x)
(Cvt64to64F x) -> (CDGBRA x)

(Cvt32Fto32 x) -> (CFEBRA x)
(Cvt32Fto64 x) -> (CGEBRA x)
(Cvt64Fto32 x) -> (CFDBRA x)
(Cvt64Fto64 x) -> (CGDBRA x)

(Cvt32Fto64F x) -> (LDEBR x)
(Cvt64Fto32F x) -> (LEDBR x)

// Lowering shifts
// Unsigned shifts need to return 0 if shift amount is >= width of shifted value.
//   result = (arg << shift) & (shift >= argbits ? 0 : 0xffffffffffffffff)
(Lsh64x64 <t> x y) -> (AND (SLD <t> x y) (SUBEcarrymask <t> (CMPUconst y [63])))
(Lsh64x32 <t> x y) -> (AND (SLD <t> x y) (SUBEcarrymask <t> (CMPWUconst y [63])))
(Lsh64x16 <t> x y) -> (AND (SLD <t> x y) (SUBEcarrymask <t> (CMPWUconst (MOVHZreg y) [63])))
(Lsh64x8  <t> x y) -> (AND (SLD <t> x y) (SUBEcarrymask <t> (CMPWUconst (MOVBZreg y) [63])))

(Lsh32x64 <t> x y) -> (ANDW (SLW <t> x y) (SUBEWcarrymask <t> (CMPUconst y [31])))
(Lsh32x32 <t> x y) -> (ANDW (SLW <t> x y) (SUBEWcarrymask <t> (CMPWUconst y [31])))
(Lsh32x16 <t> x y) -> (ANDW (SLW <t> x y) (SUBEWcarrymask <t> (CMPWUconst (MOVHZreg y) [31])))
(Lsh32x8  <t> x y) -> (ANDW (SLW <t> x y) (SUBEWcarrymask <t> (CMPWUconst (MOVBZreg y) [31])))

(Lsh16x64 <t> x y) -> (ANDW (SLW <t> x y) (SUBEWcarrymask <t> (CMPUconst y [31])))
(Lsh16x32 <t> x y) -> (ANDW (SLW <t> x y) (SUBEWcarrymask <t> (CMPWUconst y [31])))
(Lsh16x16 <t> x y) -> (ANDW (SLW <t> x y) (SUBEWcarrymask <t> (CMPWUconst (MOVHZreg y) [31])))
(Lsh16x8  <t> x y) -> (ANDW (SLW <t> x y) (SUBEWcarrymask <t> (CMPWUconst (MOVBZreg y) [31])))

(Lsh8x64 <t> x y)  -> (ANDW (SLW <t> x y) (SUBEWcarrymask <t> (CMPUconst y [31])))
(Lsh8x32 <t> x y)  -> (ANDW (SLW <t> x y) (SUBEWcarrymask <t> (CMPWUconst y [31])))
(Lsh8x16 <t> x y)  -> (ANDW (SLW <t> x y) (SUBEWcarrymask <t> (CMPWUconst (MOVHZreg y) [31])))
(Lsh8x8  <t> x y)  -> (ANDW (SLW <t> x y) (SUBEWcarrymask <t> (CMPWUconst (MOVBZreg y) [31])))

(Rsh64Ux64 <t> x y) -> (AND (SRD <t> x y) (SUBEcarrymask <t> (CMPUconst y [63])))
(Rsh64Ux32 <t> x y) -> (AND (SRD <t> x y) (SUBEcarrymask <t> (CMPWUconst y [63])))
(Rsh64Ux16 <t> x y) -> (AND (SRD <t> x y) (SUBEcarrymask <t> (CMPWUconst (MOVHZreg y) [63])))
(Rsh64Ux8  <t> x y) -> (AND (SRD <t> x y) (SUBEcarrymask <t> (CMPWUconst (MOVBZreg y) [63])))

(Rsh32Ux64 <t> x y) -> (ANDW (SRW <t> x y) (SUBEWcarrymask <t> (CMPUconst y [31])))
(Rsh32Ux32 <t> x y) -> (ANDW (SRW <t> x y) (SUBEWcarrymask <t> (CMPWUconst y [31])))
(Rsh32Ux16 <t> x y) -> (ANDW (SRW <t> x y) (SUBEWcarrymask <t> (CMPWUconst (MOVHZreg y) [31])))
(Rsh32Ux8  <t> x y) -> (ANDW (SRW <t> x y) (SUBEWcarrymask <t> (CMPWUconst (MOVBZreg y) [31])))

(Rsh16Ux64 <t> x y) -> (ANDW (SRW <t> (MOVHZreg x) y) (SUBEWcarrymask <t> (CMPUconst y [15])))
(Rsh16Ux32 <t> x y) -> (ANDW (SRW <t> (MOVHZreg x) y) (SUBEWcarrymask <t> (CMPWUconst y [15])))
(Rsh16Ux16 <t> x y) -> (ANDW (SRW <t> (MOVHZreg x) y) (SUBEWcarrymask <t> (CMPWUconst (MOVHZreg y) [15])))
(Rsh16Ux8  <t> x y) -> (ANDW (SRW <t> (MOVHZreg x) y) (SUBEWcarrymask <t> (CMPWUconst (MOVBZreg y) [15])))

(Rsh8Ux64 <t> x y)  -> (ANDW (SRW <t> (MOVBZreg x) y) (SUBEWcarrymask <t> (CMPUconst y [7])))
(Rsh8Ux32 <t> x y)  -> (ANDW (SRW <t> (MOVBZreg x) y) (SUBEWcarrymask <t> (CMPWUconst y [7])))
(Rsh8Ux16 <t> x y)  -> (ANDW (SRW <t> (MOVBZreg x) y) (SUBEWcarrymask <t> (CMPWUconst (MOVHZreg y) [7])))
(Rsh8Ux8  <t> x y)  -> (ANDW (SRW <t> (MOVBZreg x) y) (SUBEWcarrymask <t> (CMPWUconst (MOVBZreg y) [7])))

// Signed right shift needs to return 0/-1 if shift amount is >= width of shifted value.
// We implement this by setting the shift value to -1 (all ones) if the shift value is >= width.
(Rsh64x64 <t> x y) -> (SRAD <t> x (OR <y.Type> y (NOT <y.Type> (SUBEcarrymask <y.Type> (CMPUconst y [63])))))
(Rsh64x32 <t> x y) -> (SRAD <t> x (ORW <y.Type> y (NOTW <y.Type> (SUBEWcarrymask <y.Type> (CMPWUconst y [63])))))
(Rsh64x16 <t> x y) -> (SRAD <t> x (ORW <y.Type> y (NOTW <y.Type> (SUBEWcarrymask <y.Type> (CMPWUconst (MOVHZreg y) [63])))))
(Rsh64x8  <t> x y) -> (SRAD <t> x (ORW <y.Type> y (NOTW <y.Type> (SUBEWcarrymask <y.Type> (CMPWUconst (MOVBZreg y) [63])))))

(Rsh32x64 <t> x y) -> (SRAW <t> x (OR <y.Type> y (NOT <y.Type> (SUBEcarrymask <y.Type> (CMPUconst y [31])))))
(Rsh32x32 <t> x y) -> (SRAW <t> x (ORW <y.Type> y (NOTW <y.Type> (SUBEWcarrymask <y.Type> (CMPWUconst y [31])))))
(Rsh32x16 <t> x y) -> (SRAW <t> x (ORW <y.Type> y (NOTW <y.Type> (SUBEWcarrymask <y.Type> (CMPWUconst (MOVHZreg y) [31])))))
(Rsh32x8  <t> x y) -> (SRAW <t> x (ORW <y.Type> y (NOTW <y.Type> (SUBEWcarrymask <y.Type> (CMPWUconst (MOVBZreg y) [31])))))

(Rsh16x64 <t> x y) -> (SRAW <t> (MOVHreg x) (OR <y.Type> y (NOT <y.Type> (SUBEcarrymask <y.Type> (CMPUconst y [15])))))
(Rsh16x32 <t> x y) -> (SRAW <t> (MOVHreg x) (ORW <y.Type> y (NOTW <y.Type> (SUBEWcarrymask <y.Type> (CMPWUconst y [15])))))
(Rsh16x16 <t> x y) -> (SRAW <t> (MOVHreg x) (ORW <y.Type> y (NOTW <y.Type> (SUBEWcarrymask <y.Type> (CMPWUconst (MOVHZreg y) [15])))))
(Rsh16x8  <t> x y) -> (SRAW <t> (MOVHreg x) (ORW <y.Type> y (NOTW <y.Type> (SUBEWcarrymask <y.Type> (CMPWUconst (MOVBZreg y) [15])))))

(Rsh8x64 <t> x y)  -> (SRAW <t> (MOVBreg x) (OR <y.Type> y (NOT <y.Type> (SUBEcarrymask <y.Type> (CMPUconst y [7])))))
(Rsh8x32 <t> x y)  -> (SRAW <t> (MOVBreg x) (ORW <y.Type> y (NOTW <y.Type> (SUBEWcarrymask <y.Type> (CMPWUconst y [7])))))
(Rsh8x16 <t> x y)  -> (SRAW <t> (MOVBreg x) (ORW <y.Type> y (NOTW <y.Type> (SUBEWcarrymask <y.Type> (CMPWUconst (MOVHZreg y) [7])))))
(Rsh8x8  <t> x y)  -> (SRAW <t> (MOVBreg x) (ORW <y.Type> y (NOTW <y.Type> (SUBEWcarrymask <y.Type> (CMPWUconst (MOVBZreg y) [7])))))

// Lowering comparisons
(Less64  x y) -> (MOVDLT (MOVDconst [0]) (MOVDconst [1]) (CMP x y))
(Less32  x y) -> (MOVDLT (MOVDconst [0]) (MOVDconst [1]) (CMPW x y))
(Less16  x y) -> (MOVDLT (MOVDconst [0]) (MOVDconst [1]) (CMP (MOVHreg x) (MOVHreg y)))
(Less8   x y) -> (MOVDLT (MOVDconst [0]) (MOVDconst [1]) (CMP (MOVBreg x) (MOVBreg y)))
(Less64U x y) -> (MOVDLT (MOVDconst [0]) (MOVDconst [1]) (CMPU x y))
(Less32U x y) -> (MOVDLT (MOVDconst [0]) (MOVDconst [1]) (CMPWU x y))
(Less16U x y) -> (MOVDLT (MOVDconst [0]) (MOVDconst [1]) (CMPU (MOVHZreg x) (MOVHZreg y)))
(Less8U  x y) -> (MOVDLT (MOVDconst [0]) (MOVDconst [1]) (CMPU (MOVBZreg x) (MOVBZreg y)))
// Use SETG with reversed operands to dodge NaN case.
(Less64F x y) -> (MOVDGTnoinv (MOVDconst [0]) (MOVDconst [1]) (FCMP y x))
(Less32F x y) -> (MOVDGTnoinv (MOVDconst [0]) (MOVDconst [1]) (FCMPS y x))

(Leq64  x y) -> (MOVDLE (MOVDconst [0]) (MOVDconst [1]) (CMP x y))
(Leq32  x y) -> (MOVDLE (MOVDconst [0]) (MOVDconst [1]) (CMPW x y))
(Leq16  x y) -> (MOVDLE (MOVDconst [0]) (MOVDconst [1]) (CMP (MOVHreg x) (MOVHreg y)))
(Leq8   x y) -> (MOVDLE (MOVDconst [0]) (MOVDconst [1]) (CMP (MOVBreg x) (MOVBreg y)))
(Leq64U x y) -> (MOVDLE (MOVDconst [0]) (MOVDconst [1]) (CMPU x y))
(Leq32U x y) -> (MOVDLE (MOVDconst [0]) (MOVDconst [1]) (CMPWU x y))
(Leq16U x y) -> (MOVDLE (MOVDconst [0]) (MOVDconst [1]) (CMPU (MOVHZreg x) (MOVHZreg y)))
(Leq8U  x y) -> (MOVDLE (MOVDconst [0]) (MOVDconst [1]) (CMPU (MOVBZreg x) (MOVBZreg y)))
// Use SETGE with reversed operands to dodge NaN case.
(Leq64F x y) -> (MOVDGEnoinv (MOVDconst [0]) (MOVDconst [1]) (FCMP y x))
(Leq32F x y) -> (MOVDGEnoinv (MOVDconst [0]) (MOVDconst [1]) (FCMPS y x))

(Greater64  x y) -> (MOVDGT (MOVDconst [0]) (MOVDconst [1]) (CMP x y))
(Greater32  x y) -> (MOVDGT (MOVDconst [0]) (MOVDconst [1]) (CMPW x y))
(Greater16  x y) -> (MOVDGT (MOVDconst [0]) (MOVDconst [1]) (CMP (MOVHreg x) (MOVHreg y)))
(Greater8   x y) -> (MOVDGT (MOVDconst [0]) (MOVDconst [1]) (CMP (MOVBreg x) (MOVBreg y)))
(Greater64U x y) -> (MOVDGT (MOVDconst [0]) (MOVDconst [1]) (CMPU x y))
(Greater32U x y) -> (MOVDGT (MOVDconst [0]) (MOVDconst [1]) (CMPWU x y))
(Greater16U x y) -> (MOVDGT (MOVDconst [0]) (MOVDconst [1]) (CMPU (MOVHZreg x) (MOVHZreg y)))
(Greater8U  x y) -> (MOVDGT (MOVDconst [0]) (MOVDconst [1]) (CMPU (MOVBZreg x) (MOVBZreg y)))
(Greater64F x y) -> (MOVDGTnoinv (MOVDconst [0]) (MOVDconst [1]) (FCMP x y))
(Greater32F x y) -> (MOVDGTnoinv (MOVDconst [0]) (MOVDconst [1]) (FCMPS x y))

(Geq64  x y) -> (MOVDGE (MOVDconst [0]) (MOVDconst [1]) (CMP x y))
(Geq32  x y) -> (MOVDGE (MOVDconst [0]) (MOVDconst [1]) (CMPW x y))
(Geq16  x y) -> (MOVDGE (MOVDconst [0]) (MOVDconst [1]) (CMP (MOVHreg x) (MOVHreg y)))
(Geq8   x y) -> (MOVDGE (MOVDconst [0]) (MOVDconst [1]) (CMP (MOVBreg x) (MOVBreg y)))
(Geq64U x y) -> (MOVDGE (MOVDconst [0]) (MOVDconst [1]) (CMPU x y))
(Geq32U x y) -> (MOVDGE (MOVDconst [0]) (MOVDconst [1]) (CMPWU x y))
(Geq16U x y) -> (MOVDGE (MOVDconst [0]) (MOVDconst [1]) (CMPU (MOVHZreg x) (MOVHZreg y)))
(Geq8U  x y) -> (MOVDGE (MOVDconst [0]) (MOVDconst [1]) (CMPU (MOVBZreg x) (MOVBZreg y)))
(Geq64F x y) -> (MOVDGEnoinv (MOVDconst [0]) (MOVDconst [1]) (FCMP x y))
(Geq32F x y) -> (MOVDGEnoinv (MOVDconst [0]) (MOVDconst [1]) (FCMPS x y))

(Eq64  x y) -> (MOVDEQ (MOVDconst [0]) (MOVDconst [1]) (CMP x y))
(Eq32  x y) -> (MOVDEQ (MOVDconst [0]) (MOVDconst [1]) (CMPW x y))
(Eq16  x y) -> (MOVDEQ (MOVDconst [0]) (MOVDconst [1]) (CMP (MOVHreg x) (MOVHreg y)))
(Eq8   x y) -> (MOVDEQ (MOVDconst [0]) (MOVDconst [1]) (CMP (MOVBreg x) (MOVBreg y)))
(EqB   x y) -> (MOVDEQ (MOVDconst [0]) (MOVDconst [1]) (CMP (MOVBreg x) (MOVBreg y)))
(EqPtr x y) -> (MOVDEQ (MOVDconst [0]) (MOVDconst [1]) (CMP x y))
(Eq64F x y) -> (MOVDEQ (MOVDconst [0]) (MOVDconst [1]) (FCMP x y))
(Eq32F x y) -> (MOVDEQ (MOVDconst [0]) (MOVDconst [1]) (FCMPS x y))

(Neq64  x y) -> (MOVDNE (MOVDconst [0]) (MOVDconst [1]) (CMP x y))
(Neq32  x y) -> (MOVDNE (MOVDconst [0]) (MOVDconst [1]) (CMPW x y))
(Neq16  x y) -> (MOVDNE (MOVDconst [0]) (MOVDconst [1]) (CMP (MOVHreg x) (MOVHreg y)))
(Neq8   x y) -> (MOVDNE (MOVDconst [0]) (MOVDconst [1]) (CMP (MOVBreg x) (MOVBreg y)))
(NeqB   x y) -> (MOVDNE (MOVDconst [0]) (MOVDconst [1]) (CMP (MOVBreg x) (MOVBreg y)))
(NeqPtr x y) -> (MOVDNE (MOVDconst [0]) (MOVDconst [1]) (CMP x y))
(Neq64F x y) -> (MOVDNE (MOVDconst [0]) (MOVDconst [1]) (FCMP x y))
(Neq32F x y) -> (MOVDNE (MOVDconst [0]) (MOVDconst [1]) (FCMPS x y))

// Lowering loads
(Load <t> ptr mem) && (is64BitInt(t) || isPtr(t)) -> (MOVDload ptr mem)
(Load <t> ptr mem) && is32BitInt(t) && isSigned(t) -> (MOVWload ptr mem)
(Load <t> ptr mem) && is32BitInt(t) && !isSigned(t) -> (MOVWZload ptr mem)
(Load <t> ptr mem) && is16BitInt(t) && isSigned(t) -> (MOVHload ptr mem)
(Load <t> ptr mem) && is16BitInt(t) && !isSigned(t) -> (MOVHZload ptr mem)
(Load <t> ptr mem) && is8BitInt(t) && isSigned(t) -> (MOVBload ptr mem)
(Load <t> ptr mem) && (t.IsBoolean() || (is8BitInt(t) && !isSigned(t))) -> (MOVBZload ptr mem)
(Load <t> ptr mem) && is32BitFloat(t) -> (FMOVSload ptr mem)
(Load <t> ptr mem) && is64BitFloat(t) -> (FMOVDload ptr mem)

// Lowering stores
// These more-specific FP versions of Store pattern should come first.
(Store [8] ptr val mem) && is64BitFloat(val.Type) -> (FMOVDstore ptr val mem)
(Store [4] ptr val mem) && is32BitFloat(val.Type) -> (FMOVSstore ptr val mem)

(Store [8] ptr val mem) -> (MOVDstore ptr val mem)
(Store [4] ptr val mem) -> (MOVWstore ptr val mem)
(Store [2] ptr val mem) -> (MOVHstore ptr val mem)
(Store [1] ptr val mem) -> (MOVBstore ptr val mem)

// Lowering moves

// Load and store for small copies.
(Move [s] _ _ mem) && SizeAndAlign(s).Size() == 0 -> mem
(Move [s] dst src mem) && SizeAndAlign(s).Size() == 1 -> (MOVBstore dst (MOVBZload src mem) mem)
(Move [s] dst src mem) && SizeAndAlign(s).Size() == 2 -> (MOVHstore dst (MOVHZload src mem) mem)
(Move [s] dst src mem) && SizeAndAlign(s).Size() == 4 -> (MOVWstore dst (MOVWZload src mem) mem)
(Move [s] dst src mem) && SizeAndAlign(s).Size() == 8 -> (MOVDstore dst (MOVDload src mem) mem)
(Move [s] dst src mem) && SizeAndAlign(s).Size() == 16 ->
	(MOVDstore [8] dst (MOVDload [8] src mem)
		(MOVDstore dst (MOVDload src mem) mem))
(Move [s] dst src mem) && SizeAndAlign(s).Size() == 24 ->
        (MOVDstore [16] dst (MOVDload [16] src mem)
	        (MOVDstore [8] dst (MOVDload [8] src mem)
                (MOVDstore dst (MOVDload src mem) mem)))
(Move [s] dst src mem)  && SizeAndAlign(s).Size() == 3 ->
	(MOVBstore [2] dst (MOVBZload [2] src mem)
		(MOVHstore dst (MOVHZload src mem) mem))
(Move [s] dst src mem) && SizeAndAlign(s).Size() == 5 ->
	(MOVBstore [4] dst (MOVBZload [4] src mem)
		(MOVWstore dst (MOVWZload src mem) mem))
(Move [s] dst src mem) && SizeAndAlign(s).Size() == 6 ->
	(MOVHstore [4] dst (MOVHZload [4] src mem)
		(MOVWstore dst (MOVWZload src mem) mem))
(Move [s] dst src mem) && SizeAndAlign(s).Size() == 7 ->
	(MOVBstore [6] dst (MOVBZload [6] src mem)
		(MOVHstore [4] dst (MOVHZload [4] src mem)
			(MOVWstore dst (MOVWZload src mem) mem)))

// MVC for other moves. Use up to 4 instructions (sizes up to 1024 bytes).
(Move [s] dst src mem) && SizeAndAlign(s).Size() > 0 && SizeAndAlign(s).Size() <= 256 ->
	(MVC [makeValAndOff(SizeAndAlign(s).Size(), 0)] dst src mem)
(Move [s] dst src mem) && SizeAndAlign(s).Size() > 256 && SizeAndAlign(s).Size() <= 512 ->
	(MVC [makeValAndOff(SizeAndAlign(s).Size()-256, 256)] dst src (MVC [makeValAndOff(256, 0)] dst src mem))
(Move [s] dst src mem) && SizeAndAlign(s).Size() > 512 && SizeAndAlign(s).Size() <= 768 ->
	(MVC [makeValAndOff(SizeAndAlign(s).Size()-512, 512)] dst src (MVC [makeValAndOff(256, 256)] dst src (MVC [makeValAndOff(256, 0)] dst src mem)))
(Move [s] dst src mem) && SizeAndAlign(s).Size() > 768 && SizeAndAlign(s).Size() <= 1024 ->
	(MVC [makeValAndOff(SizeAndAlign(s).Size()-768, 768)] dst src (MVC [makeValAndOff(256, 512)] dst src (MVC [makeValAndOff(256, 256)] dst src (MVC [makeValAndOff(256, 0)] dst src mem))))

// Move more than 1024 bytes using a loop.
(Move [s] dst src mem) && SizeAndAlign(s).Size() > 1024 ->
	(LoweredMove [SizeAndAlign(s).Size()%256] dst src (ADDconst <src.Type> src [(SizeAndAlign(s).Size()/256)*256]) mem)

// Lowering Zero instructions
(Zero [s] _ mem) && SizeAndAlign(s).Size() == 0 -> mem
(Zero [s] destptr mem) && SizeAndAlign(s).Size() == 1 -> (MOVBstoreconst [0] destptr mem)
(Zero [s] destptr mem) && SizeAndAlign(s).Size() == 2 -> (MOVHstoreconst [0] destptr mem)
(Zero [s] destptr mem) && SizeAndAlign(s).Size() == 4 -> (MOVWstoreconst [0] destptr mem)
(Zero [s] destptr mem) && SizeAndAlign(s).Size() == 8 -> (MOVDstoreconst [0] destptr mem)
(Zero [s] destptr mem) && SizeAndAlign(s).Size() == 3 ->
	(MOVBstoreconst [makeValAndOff(0,2)] destptr
		(MOVHstoreconst [0] destptr mem))
(Zero [s] destptr mem) && SizeAndAlign(s).Size() == 5 ->
	(MOVBstoreconst [makeValAndOff(0,4)] destptr
		(MOVWstoreconst [0] destptr mem))
(Zero [s] destptr mem) && SizeAndAlign(s).Size() == 6 ->
	(MOVHstoreconst [makeValAndOff(0,4)] destptr
		(MOVWstoreconst [0] destptr mem))
(Zero [s] destptr mem) && SizeAndAlign(s).Size() == 7 ->
	(MOVWstoreconst [makeValAndOff(0,3)] destptr
		(MOVWstoreconst [0] destptr mem))

(Zero [s] destptr mem) && SizeAndAlign(s).Size() > 0 && SizeAndAlign(s).Size() <= 1024 ->
	(CLEAR [makeValAndOff(SizeAndAlign(s).Size(), 0)] destptr mem)

// Move more than 1024 bytes using a loop.
(Zero [s] destptr mem) && SizeAndAlign(s).Size() > 1024 ->
	(LoweredZero [SizeAndAlign(s).Size()%256] destptr (ADDconst <destptr.Type> destptr [(SizeAndAlign(s).Size()/256)*256]) mem)

// Lowering constants
(Const8   [val]) -> (MOVDconst [val])
(Const16  [val]) -> (MOVDconst [val])
(Const32  [val]) -> (MOVDconst [val])
(Const64  [val]) -> (MOVDconst [val])
(Const32F [val]) -> (FMOVSconst [val])
(Const64F [val]) -> (FMOVDconst [val])
(ConstNil) -> (MOVDconst [0])
(ConstBool [b]) -> (MOVDconst [b])

// Lowering calls
(StaticCall [argwid] {target} mem) -> (CALLstatic [argwid] {target} mem)
(ClosureCall [argwid] entry closure mem) -> (CALLclosure [argwid] entry closure mem)
(DeferCall [argwid] mem) -> (CALLdefer [argwid] mem)
(GoCall [argwid] mem) -> (CALLgo [argwid] mem)
(InterCall [argwid] entry mem) -> (CALLinter [argwid] entry mem)

// Miscellaneous
(Convert <t> x mem) -> (MOVDconvert <t> x mem)
(IsNonNil p) -> (MOVDNE (MOVDconst [0]) (MOVDconst [1]) (CMPconst p [0]))
(IsInBounds idx len) -> (MOVDLT (MOVDconst [0]) (MOVDconst [1]) (CMPU idx len))
(IsSliceInBounds idx len) -> (MOVDLE (MOVDconst [0]) (MOVDconst [1]) (CMPU idx len))
(NilCheck ptr mem) -> (LoweredNilCheck ptr mem)
(GetG mem) -> (LoweredGetG mem)
(GetClosurePtr) -> (LoweredGetClosurePtr)
(Addr {sym} base) -> (MOVDaddr {sym} base)
(ITab (Load ptr mem)) -> (MOVDload ptr mem)

// block rewrites
(If (MOVDLT (MOVDconst [0]) (MOVDconst [1]) cmp) yes no) -> (LT cmp yes no)
(If (MOVDLE (MOVDconst [0]) (MOVDconst [1]) cmp) yes no) -> (LE cmp yes no)
(If (MOVDGT (MOVDconst [0]) (MOVDconst [1]) cmp) yes no) -> (GT cmp yes no)
(If (MOVDGE (MOVDconst [0]) (MOVDconst [1]) cmp) yes no) -> (GE cmp yes no)
(If (MOVDEQ (MOVDconst [0]) (MOVDconst [1]) cmp) yes no) -> (EQ cmp yes no)
(If (MOVDNE (MOVDconst [0]) (MOVDconst [1]) cmp) yes no) -> (NE cmp yes no)

// Special case for floating point - LF/LEF not generated.
(If (MOVDGTnoinv (MOVDconst [0]) (MOVDconst [1]) cmp) yes no) -> (GTF cmp yes no)
(If (MOVDGEnoinv (MOVDconst [0]) (MOVDconst [1]) cmp) yes no) -> (GEF cmp yes no)

(If cond yes no) -> (NE (CMPWconst [0] (MOVBZreg cond)) yes no)

// ***************************
// Above: lowering rules
// Below: optimizations
// ***************************
// TODO: Should the optimizations be a separate pass?

// if a register move has only 1 use, just use the same register without emitting instruction
// MOVDnop doesn't emit instruction, only for ensuring the type.
(MOVDreg x) && x.Uses == 1 -> (MOVDnop x)

// Fold sign extensions into conditional moves of constants.
// Designed to remove the MOVBZreg inserted by the If lowering.
(MOVBZreg x:(MOVDLT (MOVDconst [c]) (MOVDconst [d]) _)) && int64(uint8(c)) == c && int64(uint8(d)) == d -> (MOVDreg x)
(MOVBZreg x:(MOVDLE (MOVDconst [c]) (MOVDconst [d]) _)) && int64(uint8(c)) == c && int64(uint8(d)) == d -> (MOVDreg x)
(MOVBZreg x:(MOVDGT (MOVDconst [c]) (MOVDconst [d]) _)) && int64(uint8(c)) == c && int64(uint8(d)) == d -> (MOVDreg x)
(MOVBZreg x:(MOVDGE (MOVDconst [c]) (MOVDconst [d]) _)) && int64(uint8(c)) == c && int64(uint8(d)) == d -> (MOVDreg x)
(MOVBZreg x:(MOVDEQ (MOVDconst [c]) (MOVDconst [d]) _)) && int64(uint8(c)) == c && int64(uint8(d)) == d -> (MOVDreg x)
(MOVBZreg x:(MOVDNE (MOVDconst [c]) (MOVDconst [d]) _)) && int64(uint8(c)) == c && int64(uint8(d)) == d -> (MOVDreg x)
(MOVBZreg x:(MOVDGTnoinv (MOVDconst [c]) (MOVDconst [d]) _)) && int64(uint8(c)) == c && int64(uint8(d)) == d -> (MOVDreg x)
(MOVBZreg x:(MOVDGEnoinv (MOVDconst [c]) (MOVDconst [d]) _)) && int64(uint8(c)) == c && int64(uint8(d)) == d -> (MOVDreg x)

// Fold boolean tests into blocks.
(NE (CMPWconst [0] (MOVDLT (MOVDconst [0]) (MOVDconst [1]) cmp)) yes no) -> (LT cmp yes no)
(NE (CMPWconst [0] (MOVDLE (MOVDconst [0]) (MOVDconst [1]) cmp)) yes no) -> (LE cmp yes no)
(NE (CMPWconst [0] (MOVDGT (MOVDconst [0]) (MOVDconst [1]) cmp)) yes no) -> (GT cmp yes no)
(NE (CMPWconst [0] (MOVDGE (MOVDconst [0]) (MOVDconst [1]) cmp)) yes no) -> (GE cmp yes no)
(NE (CMPWconst [0] (MOVDEQ (MOVDconst [0]) (MOVDconst [1]) cmp)) yes no) -> (EQ cmp yes no)
(NE (CMPWconst [0] (MOVDNE (MOVDconst [0]) (MOVDconst [1]) cmp)) yes no) -> (NE cmp yes no)
(NE (CMPWconst [0] (MOVDGTnoinv (MOVDconst [0]) (MOVDconst [1]) cmp)) yes no) -> (GTF cmp yes no)
(NE (CMPWconst [0] (MOVDGEnoinv (MOVDconst [0]) (MOVDconst [1]) cmp)) yes no) -> (GEF cmp yes no)

// Fold constants into instructions.
(ADD x (MOVDconst [c])) && is32Bit(c) -> (ADDconst [c] x)
(ADD (MOVDconst [c]) x) && is32Bit(c) -> (ADDconst [c] x)
(ADDW x (MOVDconst [c])) -> (ADDWconst [c] x)
(ADDW (MOVDconst [c]) x) -> (ADDWconst [c] x)

(SUB x (MOVDconst [c])) && is32Bit(c) -> (SUBconst x [c])
(SUB (MOVDconst [c]) x) && is32Bit(c) -> (NEG (SUBconst <v.Type> x [c]))
(SUBW x (MOVDconst [c])) -> (SUBWconst x [c])
(SUBW (MOVDconst [c]) x) -> (NEGW (SUBWconst <v.Type> x [c]))

(MULLD x (MOVDconst [c])) && is32Bit(c) -> (MULLDconst [c] x)
(MULLD (MOVDconst [c]) x) && is32Bit(c) -> (MULLDconst [c] x)
(MULLW x (MOVDconst [c])) -> (MULLWconst [c] x)
(MULLW (MOVDconst [c]) x) -> (MULLWconst [c] x)

// NILF instructions leave the high 32 bits unchanged which is
// equivalent to the leftmost 32 bits being set.
// TODO(mundaym): modify the assembler to accept 64-bit values
// and use isU32Bit(^c).
(AND x (MOVDconst [c])) && is32Bit(c) && c < 0 -> (ANDconst [c] x)
(AND (MOVDconst [c]) x) && is32Bit(c) && c < 0 -> (ANDconst [c] x)
(ANDW x (MOVDconst [c])) -> (ANDWconst [c] x)
(ANDW (MOVDconst [c]) x) -> (ANDWconst [c] x)

(ANDWconst [c] (ANDWconst [d] x)) -> (ANDWconst [c & d] x)
(ANDconst [c] (ANDconst [d] x)) -> (ANDconst [c & d] x)

(OR x (MOVDconst [c])) && isU32Bit(c) -> (ORconst [c] x)
(OR (MOVDconst [c]) x) && isU32Bit(c) -> (ORconst [c] x)
(ORW x (MOVDconst [c])) -> (ORWconst [c] x)
(ORW (MOVDconst [c]) x) -> (ORWconst [c] x)

(XOR x (MOVDconst [c])) && isU32Bit(c) -> (XORconst [c] x)
(XOR (MOVDconst [c]) x) && isU32Bit(c) -> (XORconst [c] x)
(XORW x (MOVDconst [c])) -> (XORWconst [c] x)
(XORW (MOVDconst [c]) x) -> (XORWconst [c] x)

(SLD x (MOVDconst [c])) -> (SLDconst [c&63] x)
(SLW x (MOVDconst [c])) -> (SLWconst [c&63] x)
(SRD x (MOVDconst [c])) -> (SRDconst [c&63] x)
(SRW x (MOVDconst [c])) -> (SRWconst [c&63] x)
(SRAD x (MOVDconst [c])) -> (SRADconst [c&63] x)
(SRAW x (MOVDconst [c])) -> (SRAWconst [c&63] x)

(SRAW x (ANDWconst [63] y)) -> (SRAW x y)
(SRAD x (ANDconst [63] y)) -> (SRAD x y)
(SLW x (ANDWconst [63] y)) -> (SLW x y)
(SLD x (ANDconst [63] y)) -> (SLD x y)
(SRW x (ANDWconst [63] y)) -> (SRW x y)
(SRD x (ANDconst [63] y)) -> (SRD x y)

// Rotate generation
(ADD (SLDconst x [c]) (SRDconst x [64-c])) -> (RLLGconst [   c] x)
( OR (SLDconst x [c]) (SRDconst x [64-c])) -> (RLLGconst [   c] x)
(XOR (SLDconst x [c]) (SRDconst x [64-c])) -> (RLLGconst [   c] x)
(ADD (SRDconst x [c]) (SLDconst x [64-c])) -> (RLLGconst [64-c] x)
( OR (SRDconst x [c]) (SLDconst x [64-c])) -> (RLLGconst [64-c] x)
(XOR (SRDconst x [c]) (SLDconst x [64-c])) -> (RLLGconst [64-c] x)

(ADDW (SLWconst x [c]) (SRWconst x [32-c])) -> (RLLconst [   c] x)
( ORW (SLWconst x [c]) (SRWconst x [32-c])) -> (RLLconst [   c] x)
(XORW (SLWconst x [c]) (SRWconst x [32-c])) -> (RLLconst [   c] x)
(ADDW (SRWconst x [c]) (SLWconst x [32-c])) -> (RLLconst [32-c] x)
( ORW (SRWconst x [c]) (SLWconst x [32-c])) -> (RLLconst [32-c] x)
(XORW (SRWconst x [c]) (SLWconst x [32-c])) -> (RLLconst [32-c] x)

(CMP x (MOVDconst [c])) && is32Bit(c) -> (CMPconst x [c])
(CMP (MOVDconst [c]) x) && is32Bit(c) -> (InvertFlags (CMPconst x [c]))
(CMPW x (MOVDconst [c])) -> (CMPWconst x [c])
(CMPW (MOVDconst [c]) x) -> (InvertFlags (CMPWconst x [c]))
(CMPU x (MOVDconst [c])) && is32Bit(c) -> (CMPUconst x [int64(uint32(c))])
(CMPU (MOVDconst [c]) x) && is32Bit(c) -> (InvertFlags (CMPUconst x [int64(uint32(c))]))
(CMPWU x (MOVDconst [c])) -> (CMPWUconst x [int64(uint32(c))])
(CMPWU (MOVDconst [c]) x) -> (InvertFlags (CMPWUconst x [int64(uint32(c))]))

// Using MOV{W,H,B}Zreg instead of AND is cheaper.
(AND (MOVDconst [0xFF]) x) -> (MOVBZreg x)
(AND x (MOVDconst [0xFF])) -> (MOVBZreg x)
(AND (MOVDconst [0xFFFF]) x) -> (MOVHZreg x)
(AND x (MOVDconst [0xFFFF])) -> (MOVHZreg x)
(AND (MOVDconst [0xFFFFFFFF]) x) -> (MOVWZreg x)
(AND x (MOVDconst [0xFFFFFFFF])) -> (MOVWZreg x)
(ANDWconst [0xFF] x) -> (MOVBZreg x)
(ANDWconst [0xFFFF] x) -> (MOVHZreg x)

// strength reduction
(MULLDconst [-1] x) -> (NEG x)
(MULLDconst [0] _) -> (MOVDconst [0])
(MULLDconst [1] x) -> x
(MULLDconst [c] x) && isPowerOfTwo(c) -> (SLDconst [log2(c)] x)
(MULLDconst [c] x) && isPowerOfTwo(c+1) && c >= 15 -> (SUB (SLDconst <v.Type> [log2(c+1)] x) x)
(MULLDconst [c] x) && isPowerOfTwo(c-1) && c >= 17 -> (ADD (SLDconst <v.Type> [log2(c-1)] x) x)

(MULLWconst [-1] x) -> (NEGW x)
(MULLWconst [0] _) -> (MOVDconst [0])
(MULLWconst [1] x) -> x
(MULLWconst [c] x) && isPowerOfTwo(c) -> (SLWconst [log2(c)] x)
(MULLWconst [c] x) && isPowerOfTwo(c+1) && c >= 15 -> (SUBW (SLWconst <v.Type> [log2(c+1)] x) x)
(MULLWconst [c] x) && isPowerOfTwo(c-1) && c >= 17 -> (ADDW (SLWconst <v.Type> [log2(c-1)] x) x)

// Fold ADD into MOVDaddr. Odd offsets from SB shouldn't be folded (LARL can't handle them).
(ADDconst [c] (MOVDaddr [d] {s} x:(SB))) && ((c+d)&1 == 0) && is32Bit(c+d) -> (MOVDaddr [c+d] {s} x)
(ADDconst [c] (MOVDaddr [d] {s} x)) && x.Op != OpSB && is20Bit(c+d) -> (MOVDaddr [c+d] {s} x)
(ADD x (MOVDaddr [c] {s} y)) && x.Op != OpSB && y.Op != OpSB -> (MOVDaddridx [c] {s} x y)
(ADD (MOVDaddr [c] {s} x) y) && x.Op != OpSB && y.Op != OpSB -> (MOVDaddridx [c] {s} x y)

// fold ADDconst into MOVDaddrx
(ADDconst [c] (MOVDaddridx [d] {s} x y)) && is20Bit(c+d) -> (MOVDaddridx [c+d] {s} x y)
(MOVDaddridx [c] {s} (ADDconst [d] x) y) && is20Bit(c+d) && x.Op != OpSB -> (MOVDaddridx [c+d] {s} x y)
(MOVDaddridx [c] {s} x (ADDconst [d] y)) && is20Bit(c+d) && y.Op != OpSB -> (MOVDaddridx [c+d] {s} x y)

// reverse ordering of compare instruction
(MOVDLT x y (InvertFlags cmp)) -> (MOVDGT x y cmp)
(MOVDGT x y (InvertFlags cmp)) -> (MOVDLT x y cmp)
(MOVDLE x y (InvertFlags cmp)) -> (MOVDGE x y cmp)
(MOVDGE x y (InvertFlags cmp)) -> (MOVDLE x y cmp)
(MOVDEQ x y (InvertFlags cmp)) -> (MOVDEQ x y cmp)
(MOVDNE x y (InvertFlags cmp)) -> (MOVDNE x y cmp)

// don't extend after proper load
(MOVBreg x:(MOVBload _ _)) -> (MOVDreg x)
(MOVBZreg x:(MOVBZload _ _)) -> (MOVDreg x)
(MOVHreg x:(MOVBload _ _)) -> (MOVDreg x)
(MOVHreg x:(MOVBZload _ _)) -> (MOVDreg x)
(MOVHreg x:(MOVHload _ _)) -> (MOVDreg x)
(MOVHZreg x:(MOVBZload _ _)) -> (MOVDreg x)
(MOVHZreg x:(MOVHZload _ _)) -> (MOVDreg x)
(MOVWreg x:(MOVBload _ _)) -> (MOVDreg x)
(MOVWreg x:(MOVBZload _ _)) -> (MOVDreg x)
(MOVWreg x:(MOVHload _ _)) -> (MOVDreg x)
(MOVWreg x:(MOVHZload _ _)) -> (MOVDreg x)
(MOVWreg x:(MOVWload _ _)) -> (MOVDreg x)
(MOVWZreg x:(MOVBZload _ _)) -> (MOVDreg x)
(MOVWZreg x:(MOVHZload _ _)) -> (MOVDreg x)
(MOVWZreg x:(MOVWZload _ _)) -> (MOVDreg x)

// don't extend if argument is already extended
(MOVBreg x:(Arg <t>)) && is8BitInt(t) && isSigned(t) -> (MOVDreg x)
(MOVBZreg x:(Arg <t>)) && is8BitInt(t) && !isSigned(t) -> (MOVDreg x)
(MOVHreg x:(Arg <t>)) && (is8BitInt(t) || is16BitInt(t)) && isSigned(t) -> (MOVDreg x)
(MOVHZreg x:(Arg <t>)) && (is8BitInt(t) || is16BitInt(t)) && !isSigned(t) -> (MOVDreg x)
(MOVWreg x:(Arg <t>)) && (is8BitInt(t) || is16BitInt(t) || is32BitInt(t)) && isSigned(t) -> (MOVDreg x)
(MOVWZreg x:(Arg <t>)) && (is8BitInt(t) || is16BitInt(t) || is32BitInt(t)) && !isSigned(t) -> (MOVDreg x)

// fold double extensions
(MOVBreg x:(MOVBreg _)) -> (MOVDreg x)
(MOVBZreg x:(MOVBZreg _)) -> (MOVDreg x)
(MOVHreg x:(MOVBreg _)) -> (MOVDreg x)
(MOVHreg x:(MOVBZreg _)) -> (MOVDreg x)
(MOVHreg x:(MOVHreg _)) -> (MOVDreg x)
(MOVHZreg x:(MOVBZreg _)) -> (MOVDreg x)
(MOVHZreg x:(MOVHZreg _)) -> (MOVDreg x)
(MOVWreg x:(MOVBreg _)) -> (MOVDreg x)
(MOVWreg x:(MOVBZreg _)) -> (MOVDreg x)
(MOVWreg x:(MOVHreg _)) -> (MOVDreg x)
(MOVWreg x:(MOVHreg _)) -> (MOVDreg x)
(MOVWreg x:(MOVWreg _)) -> (MOVDreg x)
(MOVWZreg x:(MOVBZreg _)) -> (MOVDreg x)
(MOVWZreg x:(MOVHZreg _)) -> (MOVDreg x)
(MOVWZreg x:(MOVWZreg _)) -> (MOVDreg x)

// fold extensions into constants
(MOVBreg (MOVDconst [c])) -> (MOVDconst [int64(int8(c))])
(MOVBZreg (MOVDconst [c])) -> (MOVDconst [int64(uint8(c))])
(MOVHreg (MOVDconst [c])) -> (MOVDconst [int64(int16(c))])
(MOVHZreg (MOVDconst [c])) -> (MOVDconst [int64(uint16(c))])
(MOVWreg (MOVDconst [c])) -> (MOVDconst [int64(int32(c))])
(MOVWZreg (MOVDconst [c])) -> (MOVDconst [int64(uint32(c))])

// sign extended loads
// Note: The combined instruction must end up in the same block
// as the original load. If not, we end up making a value with
// memory type live in two different blocks, which can lead to
// multiple memory values alive simultaneously.
// Make sure we don't combine these ops if the load has another use.
// This prevents a single load from being split into multiple loads
// which then might return different values.  See test/atomicload.go.
(MOVBreg x:(MOVBZload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) -> @x.Block (MOVBload <v.Type> [off] {sym} ptr mem)
(MOVBZreg x:(MOVBZload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) -> @x.Block (MOVBZload <v.Type> [off] {sym} ptr mem)
(MOVHreg x:(MOVHZload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) -> @x.Block (MOVHload <v.Type> [off] {sym} ptr mem)
(MOVHZreg x:(MOVHZload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) -> @x.Block (MOVHZload <v.Type> [off] {sym} ptr mem)
(MOVWreg x:(MOVWZload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) -> @x.Block (MOVWload <v.Type> [off] {sym} ptr mem)
(MOVWZreg x:(MOVWZload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) -> @x.Block (MOVWZload <v.Type> [off] {sym} ptr mem)

(MOVBZreg x:(MOVBZloadidx [off] {sym} ptr idx mem)) && x.Uses == 1 && clobber(x) -> @x.Block (MOVBZloadidx <v.Type> [off] {sym} ptr idx mem)
(MOVHZreg x:(MOVHZloadidx [off] {sym} ptr idx mem)) && x.Uses == 1 && clobber(x) -> @x.Block (MOVHZloadidx <v.Type> [off] {sym} ptr idx mem)
(MOVWZreg x:(MOVWZloadidx [off] {sym} ptr idx mem)) && x.Uses == 1 && clobber(x) -> @x.Block (MOVWZloadidx <v.Type> [off] {sym} ptr idx mem)

// replace load from same location as preceding store with copy
(MOVBZload [off] {sym} ptr (MOVBstore [off2] {sym2} ptr2 x _)) && sym == sym2 && off == off2 && isSamePtr(ptr, ptr2) -> (MOVDreg x)
(MOVHZload [off] {sym} ptr (MOVHstore [off2] {sym2} ptr2 x _)) && sym == sym2 && off == off2 && isSamePtr(ptr, ptr2) -> (MOVDreg x)
(MOVWZload [off] {sym} ptr (MOVWstore [off2] {sym2} ptr2 x _)) && sym == sym2 && off == off2 && isSamePtr(ptr, ptr2) -> (MOVDreg x)
(MOVDload [off] {sym} ptr (MOVDstore [off2] {sym2} ptr2 x _)) && sym == sym2 && off == off2 && isSamePtr(ptr, ptr2) -> (MOVDreg x)

// Don't extend before storing
(MOVWstore [off] {sym} ptr (MOVWreg x) mem) -> (MOVWstore [off] {sym} ptr x mem)
(MOVHstore [off] {sym} ptr (MOVHreg x) mem) -> (MOVHstore [off] {sym} ptr x mem)
(MOVBstore [off] {sym} ptr (MOVBreg x) mem) -> (MOVBstore [off] {sym} ptr x mem)
(MOVWstore [off] {sym} ptr (MOVWZreg x) mem) -> (MOVWstore [off] {sym} ptr x mem)
(MOVHstore [off] {sym} ptr (MOVHZreg x) mem) -> (MOVHstore [off] {sym} ptr x mem)
(MOVBstore [off] {sym} ptr (MOVBZreg x) mem) -> (MOVBstore [off] {sym} ptr x mem)

// Fold constants into memory operations.
// Note that this is not always a good idea because if not all the uses of
// the ADDconst get eliminated, we still have to compute the ADDconst and we now
// have potentially two live values (ptr and (ADDconst [off] ptr)) instead of one.
// Nevertheless, let's do it!
(MOVDload   [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (MOVDload  [off1+off2] {sym} ptr mem)
(MOVWload   [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (MOVWload  [off1+off2] {sym} ptr mem)
(MOVHload   [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (MOVHload  [off1+off2] {sym} ptr mem)
(MOVBload   [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (MOVBload  [off1+off2] {sym} ptr mem)
(MOVWZload  [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (MOVWZload [off1+off2] {sym} ptr mem)
(MOVHZload  [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (MOVHZload [off1+off2] {sym} ptr mem)
(MOVBZload  [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (MOVBZload [off1+off2] {sym} ptr mem)
(FMOVSload  [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (FMOVSload [off1+off2] {sym} ptr mem)
(FMOVDload  [off1] {sym} (ADDconst [off2] ptr) mem) && is20Bit(off1+off2) -> (FMOVDload [off1+off2] {sym} ptr mem)

(MOVDstore  [off1] {sym} (ADDconst [off2] ptr) val mem) && is20Bit(off1+off2) -> (MOVDstore  [off1+off2] {sym} ptr val mem)
(MOVWstore  [off1] {sym} (ADDconst [off2] ptr) val mem) && is20Bit(off1+off2) -> (MOVWstore  [off1+off2] {sym} ptr val mem)
(MOVHstore  [off1] {sym} (ADDconst [off2] ptr) val mem) && is20Bit(off1+off2) -> (MOVHstore  [off1+off2] {sym} ptr val mem)
(MOVBstore  [off1] {sym} (ADDconst [off2] ptr) val mem) && is20Bit(off1+off2) -> (MOVBstore  [off1+off2] {sym} ptr val mem)
(FMOVSstore [off1] {sym} (ADDconst [off2] ptr) val mem) && is20Bit(off1+off2) -> (FMOVSstore [off1+off2] {sym} ptr val mem)
(FMOVDstore [off1] {sym} (ADDconst [off2] ptr) val mem) && is20Bit(off1+off2) -> (FMOVDstore [off1+off2] {sym} ptr val mem)

// Fold constants into stores.
(MOVDstore [off] {sym} ptr (MOVDconst [c]) mem) && validValAndOff(c,off) && int64(int16(c)) == c && ptr.Op != OpSB ->
	(MOVDstoreconst [makeValAndOff(c,off)] {sym} ptr mem)
(MOVWstore [off] {sym} ptr (MOVDconst [c]) mem) && validOff(off) && int64(int16(c)) == c && ptr.Op != OpSB ->
	(MOVWstoreconst [makeValAndOff(int64(int32(c)),off)] {sym} ptr mem)
(MOVHstore [off] {sym} ptr (MOVDconst [c]) mem) && validOff(off) && ptr.Op != OpSB ->
	(MOVHstoreconst [makeValAndOff(int64(int16(c)),off)] {sym} ptr mem)
(MOVBstore [off] {sym} ptr (MOVDconst [c]) mem) && validOff(off) && ptr.Op != OpSB ->
	(MOVBstoreconst [makeValAndOff(int64(int8(c)),off)] {sym} ptr mem)

// Fold address offsets into constant stores.
(MOVDstoreconst [sc] {s} (ADDconst [off] ptr) mem) && ValAndOff(sc).canAdd(off) ->
	(MOVDstoreconst [ValAndOff(sc).add(off)] {s} ptr mem)
(MOVWstoreconst [sc] {s} (ADDconst [off] ptr) mem) && ValAndOff(sc).canAdd(off) ->
	(MOVWstoreconst [ValAndOff(sc).add(off)] {s} ptr mem)
(MOVHstoreconst [sc] {s} (ADDconst [off] ptr) mem) && ValAndOff(sc).canAdd(off) ->
	(MOVHstoreconst [ValAndOff(sc).add(off)] {s} ptr mem)
(MOVBstoreconst [sc] {s} (ADDconst [off] ptr) mem) && ValAndOff(sc).canAdd(off) ->
	(MOVBstoreconst [ValAndOff(sc).add(off)] {s} ptr mem)

// We need to fold MOVDaddr into the MOVx ops so that the live variable analysis knows
// what variables are being read/written by the ops.
(MOVDload  [off1] {sym1} (MOVDaddr [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVDload  [off1+off2] {mergeSym(sym1,sym2)} base mem)
(MOVWZload  [off1] {sym1} (MOVDaddr [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVWZload  [off1+off2] {mergeSym(sym1,sym2)} base mem)
(MOVHZload  [off1] {sym1} (MOVDaddr [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVHZload  [off1+off2] {mergeSym(sym1,sym2)} base mem)
(MOVBZload  [off1] {sym1} (MOVDaddr [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVBZload  [off1+off2] {mergeSym(sym1,sym2)} base mem)
(FMOVSload [off1] {sym1} (MOVDaddr [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(FMOVSload [off1+off2] {mergeSym(sym1,sym2)} base mem)
(FMOVDload [off1] {sym1} (MOVDaddr [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(FMOVDload [off1+off2] {mergeSym(sym1,sym2)} base mem)

(MOVBload [off1] {sym1} (MOVDaddr [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVBload [off1+off2] {mergeSym(sym1,sym2)} base mem)
(MOVHload [off1] {sym1} (MOVDaddr [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVHload [off1+off2] {mergeSym(sym1,sym2)} base mem)
(MOVWload [off1] {sym1} (MOVDaddr [off2] {sym2} base) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVWload [off1+off2] {mergeSym(sym1,sym2)} base mem)

(MOVDstore  [off1] {sym1} (MOVDaddr [off2] {sym2} base) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVDstore  [off1+off2] {mergeSym(sym1,sym2)} base val mem)
(MOVWstore  [off1] {sym1} (MOVDaddr [off2] {sym2} base) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVWstore  [off1+off2] {mergeSym(sym1,sym2)} base val mem)
(MOVHstore  [off1] {sym1} (MOVDaddr [off2] {sym2} base) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVHstore  [off1+off2] {mergeSym(sym1,sym2)} base val mem)
(MOVBstore  [off1] {sym1} (MOVDaddr [off2] {sym2} base) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVBstore  [off1+off2] {mergeSym(sym1,sym2)} base val mem)
(FMOVSstore [off1] {sym1} (MOVDaddr [off2] {sym2} base) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(FMOVSstore [off1+off2] {mergeSym(sym1,sym2)} base val mem)
(FMOVDstore [off1] {sym1} (MOVDaddr [off2] {sym2} base) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(FMOVDstore [off1+off2] {mergeSym(sym1,sym2)} base val mem)

(MOVDstoreconst [sc] {sym1} (MOVDaddr [off] {sym2} ptr) mem) && canMergeSym(sym1, sym2) && ValAndOff(sc).canAdd(off) ->
	(MOVDstoreconst [ValAndOff(sc).add(off)] {mergeSym(sym1, sym2)} ptr mem)
(MOVWstoreconst [sc] {sym1} (MOVDaddr [off] {sym2} ptr) mem) && canMergeSym(sym1, sym2) && ValAndOff(sc).canAdd(off) ->
	(MOVWstoreconst [ValAndOff(sc).add(off)] {mergeSym(sym1, sym2)} ptr mem)
(MOVHstoreconst [sc] {sym1} (MOVDaddr [off] {sym2} ptr) mem) && canMergeSym(sym1, sym2) && ValAndOff(sc).canAdd(off) ->
	(MOVHstoreconst [ValAndOff(sc).add(off)] {mergeSym(sym1, sym2)} ptr mem)
(MOVBstoreconst [sc] {sym1} (MOVDaddr [off] {sym2} ptr) mem) && canMergeSym(sym1, sym2) && ValAndOff(sc).canAdd(off) ->
	(MOVBstoreconst [ValAndOff(sc).add(off)] {mergeSym(sym1, sym2)} ptr mem)

// generating indexed loads and stores
(MOVBZload [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVBZloadidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx mem)
(MOVHZload [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVHZloadidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx mem)
(MOVWZload [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVWZloadidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx mem)
(MOVDload [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVDloadidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx mem)
(FMOVSload [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(FMOVSloadidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx mem)
(FMOVDload [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(FMOVDloadidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx mem)

(MOVBstore [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVBstoreidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx val mem)
(MOVHstore [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVHstoreidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx val mem)
(MOVWstore [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVWstoreidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx val mem)
(MOVDstore [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(MOVDstoreidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx val mem)
(FMOVSstore [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(FMOVSstoreidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx val mem)
(FMOVDstore [off1] {sym1} (MOVDaddridx [off2] {sym2} ptr idx) val mem) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) ->
	(FMOVDstoreidx [off1+off2] {mergeSym(sym1,sym2)} ptr idx val mem)

(MOVBZload [off] {sym} (ADD ptr idx) mem) && ptr.Op != OpSB -> (MOVBZloadidx [off] {sym} ptr idx mem)
(MOVHZload [off] {sym} (ADD ptr idx) mem) && ptr.Op != OpSB -> (MOVHZloadidx [off] {sym} ptr idx mem)
(MOVWZload [off] {sym} (ADD ptr idx) mem) && ptr.Op != OpSB -> (MOVWZloadidx [off] {sym} ptr idx mem)
(MOVDload [off] {sym} (ADD ptr idx) mem) && ptr.Op != OpSB -> (MOVDloadidx [off] {sym} ptr idx mem)
(FMOVSload [off] {sym} (ADD ptr idx) mem) && ptr.Op != OpSB -> (FMOVSloadidx [off] {sym} ptr idx mem)
(FMOVDload [off] {sym} (ADD ptr idx) mem) && ptr.Op != OpSB -> (FMOVDloadidx [off] {sym} ptr idx mem)
(MOVBstore [off] {sym} (ADD ptr idx) val mem) && ptr.Op != OpSB -> (MOVBstoreidx [off] {sym} ptr idx val mem)
(MOVHstore [off] {sym} (ADD ptr idx) val mem) && ptr.Op != OpSB -> (MOVHstoreidx [off] {sym} ptr idx val mem)
(MOVWstore [off] {sym} (ADD ptr idx) val mem) && ptr.Op != OpSB -> (MOVWstoreidx [off] {sym} ptr idx val mem)
(MOVDstore [off] {sym} (ADD ptr idx) val mem) && ptr.Op != OpSB -> (MOVDstoreidx [off] {sym} ptr idx val mem)
(FMOVSstore [off] {sym} (ADD ptr idx) val mem) && ptr.Op != OpSB -> (FMOVSstoreidx [off] {sym} ptr idx val mem)
(FMOVDstore [off] {sym} (ADD ptr idx) val mem) && ptr.Op != OpSB -> (FMOVDstoreidx [off] {sym} ptr idx val mem)

// combine ADD into indexed loads and stores
(MOVBZloadidx [c] {sym} (ADDconst [d] ptr) idx mem) -> (MOVBZloadidx [c+d] {sym} ptr idx mem)
(MOVHZloadidx [c] {sym} (ADDconst [d] ptr) idx mem) -> (MOVHZloadidx [c+d] {sym} ptr idx mem)
(MOVWZloadidx [c] {sym} (ADDconst [d] ptr) idx mem) -> (MOVWZloadidx [c+d] {sym} ptr idx mem)
(MOVDloadidx [c] {sym} (ADDconst [d] ptr) idx mem) -> (MOVDloadidx [c+d] {sym} ptr idx mem)
(FMOVSloadidx [c] {sym} (ADDconst [d] ptr) idx mem) -> (FMOVSloadidx [c+d] {sym} ptr idx mem)
(FMOVDloadidx [c] {sym} (ADDconst [d] ptr) idx mem) -> (FMOVDloadidx [c+d] {sym} ptr idx mem)

(MOVBstoreidx [c] {sym} (ADDconst [d] ptr) idx val mem) -> (MOVBstoreidx [c+d] {sym} ptr idx val mem)
(MOVHstoreidx [c] {sym} (ADDconst [d] ptr) idx val mem) -> (MOVHstoreidx [c+d] {sym} ptr idx val mem)
(MOVWstoreidx [c] {sym} (ADDconst [d] ptr) idx val mem) -> (MOVWstoreidx [c+d] {sym} ptr idx val mem)
(MOVDstoreidx [c] {sym} (ADDconst [d] ptr) idx val mem) -> (MOVDstoreidx [c+d] {sym} ptr idx val mem)
(FMOVSstoreidx [c] {sym} (ADDconst [d] ptr) idx val mem) -> (FMOVSstoreidx [c+d] {sym} ptr idx val mem)
(FMOVDstoreidx [c] {sym} (ADDconst [d] ptr) idx val mem) -> (FMOVDstoreidx [c+d] {sym} ptr idx val mem)

(MOVBZloadidx [c] {sym} ptr (ADDconst [d] idx) mem) -> (MOVBZloadidx [c+d] {sym} ptr idx mem)
(MOVHZloadidx [c] {sym} ptr (ADDconst [d] idx) mem) -> (MOVHZloadidx [c+d] {sym} ptr idx mem)
(MOVWZloadidx [c] {sym} ptr (ADDconst [d] idx) mem) -> (MOVWZloadidx [c+d] {sym} ptr idx mem)
(MOVDloadidx [c] {sym} ptr (ADDconst [d] idx) mem) -> (MOVDloadidx [c+d] {sym} ptr idx mem)
(FMOVSloadidx [c] {sym} ptr (ADDconst [d] idx) mem) -> (FMOVSloadidx [c+d] {sym} ptr idx mem)
(FMOVDloadidx [c] {sym} ptr (ADDconst [d] idx) mem) -> (FMOVDloadidx [c+d] {sym} ptr idx mem)

(MOVBstoreidx [c] {sym} ptr (ADDconst [d] idx) val mem) -> (MOVBstoreidx [c+d] {sym} ptr idx val mem)
(MOVHstoreidx [c] {sym} ptr (ADDconst [d] idx) val mem) -> (MOVHstoreidx [c+d] {sym} ptr idx val mem)
(MOVWstoreidx [c] {sym} ptr (ADDconst [d] idx) val mem) -> (MOVWstoreidx [c+d] {sym} ptr idx val mem)
(MOVDstoreidx [c] {sym} ptr (ADDconst [d] idx) val mem) -> (MOVDstoreidx [c+d] {sym} ptr idx val mem)
(FMOVSstoreidx [c] {sym} ptr (ADDconst [d] idx) val mem) -> (FMOVSstoreidx [c+d] {sym} ptr idx val mem)
(FMOVDstoreidx [c] {sym} ptr (ADDconst [d] idx) val mem) -> (FMOVDstoreidx [c+d] {sym} ptr idx val mem)

// MOVDaddr into MOVDaddridx
(MOVDaddridx [off1] {sym1} (MOVDaddr [off2] {sym2} x) y) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) && x.Op != OpSB ->
       (MOVDaddridx [off1+off2] {mergeSym(sym1,sym2)} x y)
(MOVDaddridx [off1] {sym1} x (MOVDaddr [off2] {sym2} y)) && is32Bit(off1+off2) && canMergeSym(sym1, sym2) && y.Op != OpSB ->
       (MOVDaddridx [off1+off2] {mergeSym(sym1,sym2)} x y)

// Absorb InvertFlags into branches.
(LT (InvertFlags cmp) yes no) -> (GT cmp yes no)
(GT (InvertFlags cmp) yes no) -> (LT cmp yes no)
(LE (InvertFlags cmp) yes no) -> (GE cmp yes no)
(GE (InvertFlags cmp) yes no) -> (LE cmp yes no)
(EQ (InvertFlags cmp) yes no) -> (EQ cmp yes no)
(NE (InvertFlags cmp) yes no) -> (NE cmp yes no)

// Constant comparisons.
(CMPconst (MOVDconst [x]) [y]) && x==y -> (FlagEQ)
(CMPconst (MOVDconst [x]) [y]) && x<y -> (FlagLT)
(CMPconst (MOVDconst [x]) [y]) && x>y -> (FlagGT)
(CMPUconst (MOVDconst [x]) [y]) && uint64(x)==uint64(y) -> (FlagEQ)
(CMPUconst (MOVDconst [x]) [y]) && uint64(x)<uint64(y) -> (FlagLT)
(CMPUconst (MOVDconst [x]) [y]) && uint64(x)>uint64(y) -> (FlagGT)

(CMPWconst (MOVDconst [x]) [y]) && int32(x)==int32(y) -> (FlagEQ)
(CMPWconst (MOVDconst [x]) [y]) && int32(x)<int32(y) -> (FlagLT)
(CMPWconst (MOVDconst [x]) [y]) && int32(x)>int32(y) -> (FlagGT)
(CMPWUconst (MOVDconst [x]) [y]) && uint32(x)==uint32(y) -> (FlagEQ)
(CMPWUconst (MOVDconst [x]) [y]) && uint32(x)<uint32(y) -> (FlagLT)
(CMPWUconst (MOVDconst [x]) [y]) && uint32(x)>uint32(y) -> (FlagGT)

// Other known comparisons.
(CMPconst (MOVBZreg _) [c]) && 0xFF < c -> (FlagLT)
(CMPconst (MOVHZreg _) [c]) && 0xFFFF < c -> (FlagLT)
(CMPconst (MOVWZreg _) [c]) && 0xFFFFFFFF < c -> (FlagLT)
(CMPWconst (SRWconst _ [c]) [n]) && 0 <= n && 0 < c && c <= 32 && (1<<uint64(32-c)) <= uint64(n) -> (FlagLT)
(CMPconst (SRDconst _ [c]) [n]) && 0 <= n && 0 < c && c <= 64 && (1<<uint64(64-c)) <= uint64(n) -> (FlagLT)
(CMPconst (ANDconst _ [m]) [n]) && 0 <= m && m < n -> (FlagLT)
(CMPWconst (ANDWconst _ [m]) [n]) && 0 <= int32(m) && int32(m) < int32(n) -> (FlagLT)

// Absorb flag constants into SBB ops.
(SUBEcarrymask (FlagEQ)) -> (MOVDconst [-1])
(SUBEcarrymask (FlagLT)) -> (MOVDconst [-1])
(SUBEcarrymask (FlagGT)) -> (MOVDconst [0])
(SUBEWcarrymask (FlagEQ)) -> (MOVDconst [-1])
(SUBEWcarrymask (FlagLT)) -> (MOVDconst [-1])
(SUBEWcarrymask (FlagGT)) -> (MOVDconst [0])

// Absorb flag constants into branches.
(EQ (FlagEQ) yes no) -> (First nil yes no)
(EQ (FlagLT) yes no) -> (First nil no yes)
(EQ (FlagGT) yes no) -> (First nil no yes)

(NE (FlagEQ) yes no) -> (First nil no yes)
(NE (FlagLT) yes no) -> (First nil yes no)
(NE (FlagGT) yes no) -> (First nil yes no)

(LT (FlagEQ) yes no) -> (First nil no yes)
(LT (FlagLT) yes no) -> (First nil yes no)
(LT (FlagGT) yes no) -> (First nil no yes)

(LE (FlagEQ) yes no) -> (First nil yes no)
(LE (FlagLT) yes no) -> (First nil yes no)
(LE (FlagGT) yes no) -> (First nil no yes)

(GT (FlagEQ) yes no) -> (First nil no yes)
(GT (FlagLT) yes no) -> (First nil no yes)
(GT (FlagGT) yes no) -> (First nil yes no)

(GE (FlagEQ) yes no) -> (First nil yes no)
(GE (FlagLT) yes no) -> (First nil no yes)
(GE (FlagGT) yes no) -> (First nil yes no)

// Absorb flag constants into SETxx ops.
(MOVDEQ _ x (FlagEQ)) -> x
(MOVDEQ y _ (FlagLT)) -> y
(MOVDEQ y _ (FlagGT)) -> y

(MOVDNE y _ (FlagEQ)) -> y
(MOVDNE _ x (FlagLT)) -> x
(MOVDNE _ x (FlagGT)) -> x

(MOVDLT y _ (FlagEQ)) -> y
(MOVDLT _ x (FlagLT)) -> x
(MOVDLT y _ (FlagGT)) -> y

(MOVDLE _ x (FlagEQ)) -> x
(MOVDLE _ x (FlagLT)) -> x
(MOVDLE y _ (FlagGT)) -> y

(MOVDGT y _ (FlagEQ)) -> y
(MOVDGT y _ (FlagLT)) -> y
(MOVDGT _ x (FlagGT)) -> x

(MOVDGE _ x (FlagEQ)) -> x
(MOVDGE y _ (FlagLT)) -> y
(MOVDGE _ x (FlagGT)) -> x

// Remove redundant *const ops
(ADDconst [0] x) -> x
(ADDWconst [c] x) && int32(c)==0 -> x
(SUBconst [0] x) -> x
(SUBWconst [c] x) && int32(c) == 0 -> x
(ANDconst [0] _)                 -> (MOVDconst [0])
(ANDWconst [c] _) && int32(c)==0  -> (MOVDconst [0])
(ANDconst [-1] x)                -> x
(ANDWconst [c] x) && int32(c)==-1 -> x
(ORconst [0] x)                  -> x
(ORWconst [c] x) && int32(c)==0   -> x
(ORconst [-1] _)                 -> (MOVDconst [-1])
(ORWconst [c] _) && int32(c)==-1  -> (MOVDconst [-1])
(XORconst [0] x)                  -> x
(XORWconst [c] x) && int32(c)==0   -> x

// Convert constant subtracts to constant adds.
(SUBconst [c] x) && c != -(1<<31) -> (ADDconst [-c] x)
(SUBWconst [c] x) -> (ADDWconst [int64(int32(-c))] x)

// generic constant folding
// TODO: more of this
(ADDconst [c] (MOVDconst [d])) -> (MOVDconst [c+d])
(ADDWconst [c] (MOVDconst [d])) -> (MOVDconst [int64(int32(c+d))])
(ADDconst [c] (ADDconst [d] x)) && is32Bit(c+d) -> (ADDconst [c+d] x)
(ADDWconst [c] (ADDWconst [d] x)) -> (ADDWconst [int64(int32(c+d))] x)
(SUBconst (MOVDconst [d]) [c]) -> (MOVDconst [d-c])
(SUBconst (SUBconst x [d]) [c]) && is32Bit(-c-d) -> (ADDconst [-c-d] x)
(SRADconst [c] (MOVDconst [d])) -> (MOVDconst [d>>uint64(c)])
(SRAWconst [c] (MOVDconst [d])) -> (MOVDconst [d>>uint64(c)])
(NEG (MOVDconst [c])) -> (MOVDconst [-c])
(NEGW (MOVDconst [c])) -> (MOVDconst [int64(int32(-c))])
(MULLDconst [c] (MOVDconst [d])) -> (MOVDconst [c*d])
(MULLWconst [c] (MOVDconst [d])) -> (MOVDconst [int64(int32(c*d))])
(AND (MOVDconst [c]) (MOVDconst [d])) -> (MOVDconst [c&d])
(ANDconst [c] (MOVDconst [d])) -> (MOVDconst [c&d])
(ANDWconst [c] (MOVDconst [d])) -> (MOVDconst [c&d])
(OR (MOVDconst [c]) (MOVDconst [d])) -> (MOVDconst [c|d])
(ORconst [c] (MOVDconst [d])) -> (MOVDconst [c|d])
(ORWconst [c] (MOVDconst [d])) -> (MOVDconst [c|d])
(XOR (MOVDconst [c]) (MOVDconst [d])) -> (MOVDconst [c^d])
(XORconst [c] (MOVDconst [d])) -> (MOVDconst [c^d])
(XORWconst [c] (MOVDconst [d])) -> (MOVDconst [c^d])

// generic simplifications
// TODO: more of this
(ADD x (NEG y)) -> (SUB x y)
(ADDW x (NEGW y)) -> (SUBW x y)
(SUB x x) -> (MOVDconst [0])
(SUBW x x) -> (MOVDconst [0])
(AND x x) -> x
(ANDW x x) -> x
(OR x x) -> x
(ORW x x) -> x
(XOR x x) -> (MOVDconst [0])
(XORW x x) -> (MOVDconst [0])

// Fold memory operations into operations.
// Exclude global data (SB) because these instructions cannot handle relative addresses.
// TODO(mundaym): use LARL in the assembler to handle SB?
// TODO(mundaym): indexed versions of these?
(ADD <t> x g:(MOVDload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ADDload <t> [off] {sym} x ptr mem)
(ADD <t> g:(MOVDload [off] {sym} ptr mem) x) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ADDload <t> [off] {sym} x ptr mem)
(ADDW <t> x g:(MOVWload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ADDWload <t> [off] {sym} x ptr mem)
(ADDW <t> g:(MOVWload [off] {sym} ptr mem) x) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ADDWload <t> [off] {sym} x ptr mem)
(ADDW <t> x g:(MOVWZload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ADDWload <t> [off] {sym} x ptr mem)
(ADDW <t> g:(MOVWZload [off] {sym} ptr mem) x) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ADDWload <t> [off] {sym} x ptr mem)
(MULLD <t> x g:(MOVDload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (MULLDload <t> [off] {sym} x ptr mem)
(MULLD <t> g:(MOVDload [off] {sym} ptr mem) x) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (MULLDload <t> [off] {sym} x ptr mem)
(MULLW <t> x g:(MOVWload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (MULLWload <t> [off] {sym} x ptr mem)
(MULLW <t> g:(MOVWload [off] {sym} ptr mem) x) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (MULLWload <t> [off] {sym} x ptr mem)
(MULLW <t> x g:(MOVWZload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (MULLWload <t> [off] {sym} x ptr mem)
(MULLW <t> g:(MOVWZload [off] {sym} ptr mem) x) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (MULLWload <t> [off] {sym} x ptr mem)
(SUB <t> x g:(MOVDload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (SUBload <t> [off] {sym} x ptr mem)
(SUBW <t> x g:(MOVWload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (SUBWload <t> [off] {sym} x ptr mem)
(SUBW <t> x g:(MOVWZload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (SUBWload <t> [off] {sym} x ptr mem)
(AND <t> x g:(MOVDload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ANDload <t> [off] {sym} x ptr mem)
(AND <t> g:(MOVDload [off] {sym} ptr mem) x) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ANDload <t> [off] {sym} x ptr mem)
(ANDW <t> x g:(MOVWload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ANDWload <t> [off] {sym} x ptr mem)
(ANDW <t> g:(MOVWload [off] {sym} ptr mem) x) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ANDWload <t> [off] {sym} x ptr mem)
(ANDW <t> x g:(MOVWZload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ANDWload <t> [off] {sym} x ptr mem)
(ANDW <t> g:(MOVWZload [off] {sym} ptr mem) x) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ANDWload <t> [off] {sym} x ptr mem)
(OR <t> x g:(MOVDload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ORload <t> [off] {sym} x ptr mem)
(OR <t> g:(MOVDload [off] {sym} ptr mem) x) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ORload <t> [off] {sym} x ptr mem)
(ORW <t> x g:(MOVWload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ORWload <t> [off] {sym} x ptr mem)
(ORW <t> g:(MOVWload [off] {sym} ptr mem) x) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ORWload <t> [off] {sym} x ptr mem)
(ORW <t> x g:(MOVWZload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ORWload <t> [off] {sym} x ptr mem)
(ORW <t> g:(MOVWZload [off] {sym} ptr mem) x) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (ORWload <t> [off] {sym} x ptr mem)
(XOR <t> x g:(MOVDload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (XORload <t> [off] {sym} x ptr mem)
(XOR <t> g:(MOVDload [off] {sym} ptr mem) x) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (XORload <t> [off] {sym} x ptr mem)
(XORW <t> x g:(MOVWload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (XORWload <t> [off] {sym} x ptr mem)
(XORW <t> g:(MOVWload [off] {sym} ptr mem) x) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (XORWload <t> [off] {sym} x ptr mem)
(XORW <t> x g:(MOVWZload [off] {sym} ptr mem)) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (XORWload <t> [off] {sym} x ptr mem)
(XORW <t> g:(MOVWZload [off] {sym} ptr mem) x) && g.Uses == 1 && ptr.Op != OpSB && is20Bit(off) && canMergeLoad(v, g) && clobber(g)
	-> (XORWload <t> [off] {sym} x ptr mem)

// Combine constant stores into larger (unaligned) stores.
// It doesn't work to global data (based on SB),
// because STGRL doesn't support unaligned address
(MOVBstoreconst [c] {s} p x:(MOVBstoreconst [a] {s} p mem))
  && p.Op != OpSB
  && x.Uses == 1
  && ValAndOff(a).Off() + 1 == ValAndOff(c).Off()
  && clobber(x)
  -> (MOVHstoreconst [makeValAndOff(ValAndOff(c).Val()&0xff | ValAndOff(a).Val()<<8, ValAndOff(a).Off())] {s} p mem)
(MOVHstoreconst [c] {s} p x:(MOVHstoreconst [a] {s} p mem))
  && p.Op != OpSB
  && x.Uses == 1
  && ValAndOff(a).Off() + 2 == ValAndOff(c).Off()
  && clobber(x)
  -> (MOVWstoreconst [makeValAndOff(ValAndOff(c).Val()&0xffff | ValAndOff(a).Val()<<16, ValAndOff(a).Off())] {s} p mem)
(MOVWstoreconst [c] {s} p x:(MOVWstoreconst [a] {s} p mem))
  && p.Op != OpSB
  && x.Uses == 1
  && ValAndOff(a).Off() + 4 == ValAndOff(c).Off()
  && clobber(x)
  -> (MOVDstore [ValAndOff(a).Off()] {s} p (MOVDconst [ValAndOff(c).Val()&0xffffffff | ValAndOff(a).Val()<<32]) mem)

// Combine stores into larger (unaligned) stores.
// It doesn't work on global data (based on SB) because stores with relative addressing
// require that the memory operand be aligned.
(MOVBstore [i] {s} p w x:(MOVBstore [i-1] {s} p (SRDconst [8] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVHstore [i-1] {s} p w mem)
(MOVBstore [i] {s} p w0:(SRDconst [j] w) x:(MOVBstore [i-1] {s} p (SRDconst [j+8] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVHstore [i-1] {s} p w0 mem)
(MOVBstore [i] {s} p w x:(MOVBstore [i-1] {s} p (SRWconst [8] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVHstore [i-1] {s} p w mem)
(MOVBstore [i] {s} p w0:(SRWconst [j] w) x:(MOVBstore [i-1] {s} p (SRWconst [j+8] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVHstore [i-1] {s} p w0 mem)
(MOVHstore [i] {s} p w x:(MOVHstore [i-2] {s} p (SRDconst [16] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVWstore [i-2] {s} p w mem)
(MOVHstore [i] {s} p w0:(SRDconst [j] w) x:(MOVHstore [i-2] {s} p (SRDconst [j+16] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVWstore [i-2] {s} p w0 mem)
(MOVHstore [i] {s} p w x:(MOVHstore [i-2] {s} p (SRWconst [16] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVWstore [i-2] {s} p w mem)
(MOVHstore [i] {s} p w0:(SRWconst [j] w) x:(MOVHstore [i-2] {s} p (SRWconst [j+16] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVWstore [i-2] {s} p w0 mem)
(MOVWstore [i] {s} p (SRDconst [32] w) x:(MOVWstore [i-4] {s} p w mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVDstore [i-4] {s} p w mem)
(MOVWstore [i] {s} p w0:(SRDconst [j] w) x:(MOVWstore [i-4] {s} p (SRDconst [j+32] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVDstore [i-4] {s} p w0 mem)

(MOVBstoreidx [i] {s} p idx w x:(MOVBstoreidx [i-1] {s} p idx (SRDconst [8] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVHstoreidx [i-1] {s} p idx w mem)
(MOVBstoreidx [i] {s} p idx w0:(SRDconst [j] w) x:(MOVBstoreidx [i-1] {s} p idx (SRDconst [j+8] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVHstoreidx [i-1] {s} p idx w0 mem)
(MOVBstoreidx [i] {s} p idx w x:(MOVBstoreidx [i-1] {s} p idx (SRWconst [8] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVHstoreidx [i-1] {s} p idx w mem)
(MOVBstoreidx [i] {s} p idx w0:(SRWconst [j] w) x:(MOVBstoreidx [i-1] {s} p idx (SRWconst [j+8] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVHstoreidx [i-1] {s} p idx w0 mem)
(MOVHstoreidx [i] {s} p idx w x:(MOVHstoreidx [i-2] {s} p idx (SRDconst [16] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWstoreidx [i-2] {s} p idx w mem)
(MOVHstoreidx [i] {s} p idx w0:(SRDconst [j] w) x:(MOVHstoreidx [i-2] {s} p idx (SRDconst [j+16] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWstoreidx [i-2] {s} p idx w0 mem)
(MOVHstoreidx [i] {s} p idx w x:(MOVHstoreidx [i-2] {s} p idx (SRWconst [16] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWstoreidx [i-2] {s} p idx w mem)
(MOVHstoreidx [i] {s} p idx w0:(SRWconst [j] w) x:(MOVHstoreidx [i-2] {s} p idx (SRWconst [j+16] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWstoreidx [i-2] {s} p idx w0 mem)
(MOVWstoreidx [i] {s} p idx w x:(MOVWstoreidx [i-4] {s} p idx (SRDconst [32] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVDstoreidx [i-4] {s} p idx w mem)
(MOVWstoreidx [i] {s} p idx w0:(SRDconst [j] w) x:(MOVWstoreidx [i-4] {s} p idx (SRDconst [j+32] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVDstoreidx [i-4] {s} p idx w0 mem)

// Combine stores into larger (unaligned) stores with the bytes reversed (little endian).
// Store-with-bytes-reversed instructions do not support relative memory addresses,
// so these stores can't operate on global data (SB).
(MOVBstore [i] {s} p (SRDconst [8] w) x:(MOVBstore [i-1] {s} p w mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVHBRstore [i-1] {s} p w mem)
(MOVBstore [i] {s} p (SRDconst [j] w) x:(MOVBstore [i-1] {s} p w0:(SRDconst [j-8] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVHBRstore [i-1] {s} p w0 mem)
(MOVBstore [i] {s} p (SRWconst [8] w) x:(MOVBstore [i-1] {s} p w mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVHBRstore [i-1] {s} p w mem)
(MOVBstore [i] {s} p (SRWconst [j] w) x:(MOVBstore [i-1] {s} p w0:(SRWconst [j-8] w) mem))
  && p.Op != OpSB
  && x.Uses == 1
  && clobber(x)
  -> (MOVHBRstore [i-1] {s} p w0 mem)
(MOVHBRstore [i] {s} p (SRDconst [16] w) x:(MOVHBRstore [i-2] {s} p w mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWBRstore [i-2] {s} p w mem)
(MOVHBRstore [i] {s} p (SRDconst [j] w) x:(MOVHBRstore [i-2] {s} p w0:(SRDconst [j-16] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWBRstore [i-2] {s} p w0 mem)
(MOVHBRstore [i] {s} p (SRWconst [16] w) x:(MOVHBRstore [i-2] {s} p w mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWBRstore [i-2] {s} p w mem)
(MOVHBRstore [i] {s} p (SRWconst [j] w) x:(MOVHBRstore [i-2] {s} p w0:(SRWconst [j-16] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWBRstore [i-2] {s} p w0 mem)
(MOVWBRstore [i] {s} p (SRDconst [32] w) x:(MOVWBRstore [i-4] {s} p w mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVDBRstore [i-4] {s} p w mem)
(MOVWBRstore [i] {s} p (SRDconst [j] w) x:(MOVWBRstore [i-4] {s} p w0:(SRDconst [j-32] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVDBRstore [i-4] {s} p w0 mem)

(MOVBstoreidx [i] {s} p idx (SRDconst [8] w) x:(MOVBstoreidx [i-1] {s} p idx w mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVHBRstoreidx [i-1] {s} p idx w mem)
(MOVBstoreidx [i] {s} p idx (SRDconst [j] w) x:(MOVBstoreidx [i-1] {s} p idx w0:(SRDconst [j-8] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVHBRstoreidx [i-1] {s} p idx w0 mem)
(MOVBstoreidx [i] {s} p idx (SRWconst [8] w) x:(MOVBstoreidx [i-1] {s} p idx w mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVHBRstoreidx [i-1] {s} p idx w mem)
(MOVBstoreidx [i] {s} p idx (SRWconst [j] w) x:(MOVBstoreidx [i-1] {s} p idx w0:(SRWconst [j-8] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVHBRstoreidx [i-1] {s} p idx w0 mem)
(MOVHBRstoreidx [i] {s} p idx (SRDconst [16] w) x:(MOVHBRstoreidx [i-2] {s} p idx w mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWBRstoreidx [i-2] {s} p idx w mem)
(MOVHBRstoreidx [i] {s} p idx (SRDconst [j] w) x:(MOVHBRstoreidx [i-2] {s} p idx w0:(SRDconst [j-16] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWBRstoreidx [i-2] {s} p idx w0 mem)
(MOVHBRstoreidx [i] {s} p idx (SRWconst [16] w) x:(MOVHBRstoreidx [i-2] {s} p idx w mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWBRstoreidx [i-2] {s} p idx w mem)
(MOVHBRstoreidx [i] {s} p idx (SRWconst [j] w) x:(MOVHBRstoreidx [i-2] {s} p idx w0:(SRWconst [j-16] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVWBRstoreidx [i-2] {s} p idx w0 mem)
(MOVWBRstoreidx [i] {s} p idx (SRDconst [32] w) x:(MOVWBRstoreidx [i-4] {s} p idx w mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVDBRstoreidx [i-4] {s} p idx w mem)
(MOVWBRstoreidx [i] {s} p idx (SRDconst [j] w) x:(MOVWBRstoreidx [i-4] {s} p idx w0:(SRDconst [j-32] w) mem))
  && x.Uses == 1
  && clobber(x)
  -> (MOVDBRstoreidx [i-4] {s} p idx w0 mem)

// Combining byte loads into larger (unaligned) loads.

// Little endian loads.

// b[0] | b[1]<<8 -> load 16-bit, reverse bytes
(ORW                 x0:(MOVBZload [i]   {s} p mem)
    s0:(SLWconst [8] x1:(MOVBZload [i+1] {s} p mem)))
  && p.Op != OpSB
  && x0.Uses == 1
  && x1.Uses == 1
  && s0.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(s0)
  -> @mergePoint(b,x0,x1) (MOVHZreg (MOVHBRload [i] {s} p mem))

// b[0] | b[1]<<8 | b[2]<<16 | b[3]<<24 -> load 32-bit, reverse bytes
(ORW o0:(ORW z0:(MOVHZreg x0:(MOVHBRload [i] {s} p mem))
    s0:(SLWconst [16] x1:(MOVBZload [i+2] {s} p mem)))
    s1:(SLWconst [24] x2:(MOVBZload [i+3] {s} p mem)))
  && p.Op != OpSB
  && z0.Uses == 1
  && x0.Uses == 1
  && x1.Uses == 1
  && x2.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && o0.Uses == 1
  && mergePoint(b,x0,x1,x2) != nil
  && clobber(z0)
  && clobber(x0)
  && clobber(x1)
  && clobber(x2)
  && clobber(s0)
  && clobber(s1)
  && clobber(o0)
  -> @mergePoint(b,x0,x1,x2) (MOVWBRload [i] {s} p mem)

// b[0] | b[1]<<8 | b[2]<<16 | b[3]<<24 | b[4]<<32 | b[5]<<40 | b[6]<<48 | b[7]<<56 -> load 64-bit, reverse bytes
(OR o0:(OR o1:(OR o2:(OR o3:(OR o4:(OR o5:(OR
                      x0:(MOVBZload [i]   {s} p mem)
    s0:(SLDconst [8]  x1:(MOVBZload [i+1] {s} p mem)))
    s1:(SLDconst [16] x2:(MOVBZload [i+2] {s} p mem)))
    s2:(SLDconst [24] x3:(MOVBZload [i+3] {s} p mem)))
    s3:(SLDconst [32] x4:(MOVBZload [i+4] {s} p mem)))
    s4:(SLDconst [40] x5:(MOVBZload [i+5] {s} p mem)))
    s5:(SLDconst [48] x6:(MOVBZload [i+6] {s} p mem)))
    s6:(SLDconst [56] x7:(MOVBZload [i+7] {s} p mem)))
  && p.Op != OpSB
  && x0.Uses == 1
  && x1.Uses == 1
  && x2.Uses == 1
  && x3.Uses == 1
  && x4.Uses == 1
  && x5.Uses == 1
  && x6.Uses == 1
  && x7.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && s2.Uses == 1
  && s3.Uses == 1
  && s4.Uses == 1
  && s5.Uses == 1
  && s6.Uses == 1
  && o0.Uses == 1
  && o1.Uses == 1
  && o2.Uses == 1
  && o3.Uses == 1
  && o4.Uses == 1
  && o5.Uses == 1
  && mergePoint(b,x0,x1,x2,x3,x4,x5,x6,x7) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(x2)
  && clobber(x3)
  && clobber(x4)
  && clobber(x5)
  && clobber(x6)
  && clobber(x7)
  && clobber(s0)
  && clobber(s1)
  && clobber(s2)
  && clobber(s3)
  && clobber(s4)
  && clobber(s5)
  && clobber(s6)
  && clobber(o0)
  && clobber(o1)
  && clobber(o2)
  && clobber(o3)
  && clobber(o4)
  && clobber(o5)
  -> @mergePoint(b,x0,x1,x2,x3,x4,x5,x6,x7) (MOVDBRload [i] {s} p mem)

// b[0] | b[1]<<8 -> load 16-bit, reverse bytes
(ORW                 x0:(MOVBZloadidx [i]   {s} p idx mem)
    s0:(SLWconst [8] x1:(MOVBZloadidx [i+1] {s} p idx mem)))
  && x0.Uses == 1
  && x1.Uses == 1
  && s0.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(s0)
  -> @mergePoint(b,x0,x1) (MOVHZreg (MOVHBRloadidx <v.Type> [i] {s} p idx mem))

// b[0] | b[1]<<8 | b[2]<<16 | b[3]<<24 -> load 32-bit, reverse bytes
(ORW o0:(ORW z0:(MOVHZreg x0:(MOVHBRloadidx [i] {s} p idx mem))
    s0:(SLWconst [16] x1:(MOVBZloadidx [i+2] {s} p idx mem)))
    s1:(SLWconst [24] x2:(MOVBZloadidx [i+3] {s} p idx mem)))
  && z0.Uses == 1
  && x0.Uses == 1
  && x1.Uses == 1
  && x2.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && o0.Uses == 1
  && mergePoint(b,x0,x1,x2) != nil
  && clobber(z0)
  && clobber(x0)
  && clobber(x1)
  && clobber(x2)
  && clobber(s0)
  && clobber(s1)
  && clobber(o0)
  -> @mergePoint(b,x0,x1,x2) (MOVWZreg (MOVWBRloadidx <v.Type> [i] {s} p idx mem))

// b[0] | b[1]<<8 | b[2]<<16 | b[3]<<24 | b[4]<<32 | b[5]<<40 | b[6]<<48 | b[7]<<56 -> load 64-bit, reverse bytes
(OR o0:(OR o1:(OR o2:(OR o3:(OR o4:(OR o5:(OR
                      x0:(MOVBZloadidx [i]   {s} p idx mem)
    s0:(SLDconst [8]  x1:(MOVBZloadidx [i+1] {s} p idx mem)))
    s1:(SLDconst [16] x2:(MOVBZloadidx [i+2] {s} p idx mem)))
    s2:(SLDconst [24] x3:(MOVBZloadidx [i+3] {s} p idx mem)))
    s3:(SLDconst [32] x4:(MOVBZloadidx [i+4] {s} p idx mem)))
    s4:(SLDconst [40] x5:(MOVBZloadidx [i+5] {s} p idx mem)))
    s5:(SLDconst [48] x6:(MOVBZloadidx [i+6] {s} p idx mem)))
    s6:(SLDconst [56] x7:(MOVBZloadidx [i+7] {s} p idx mem)))
  && x0.Uses == 1
  && x1.Uses == 1
  && x2.Uses == 1
  && x3.Uses == 1
  && x4.Uses == 1
  && x5.Uses == 1
  && x6.Uses == 1
  && x7.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && s2.Uses == 1
  && s3.Uses == 1
  && s4.Uses == 1
  && s5.Uses == 1
  && s6.Uses == 1
  && o0.Uses == 1
  && o1.Uses == 1
  && o2.Uses == 1
  && o3.Uses == 1
  && o4.Uses == 1
  && o5.Uses == 1
  && mergePoint(b,x0,x1,x2,x3,x4,x5,x6,x7) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(x2)
  && clobber(x3)
  && clobber(x4)
  && clobber(x5)
  && clobber(x6)
  && clobber(x7)
  && clobber(s0)
  && clobber(s1)
  && clobber(s2)
  && clobber(s3)
  && clobber(s4)
  && clobber(s5)
  && clobber(s6)
  && clobber(o0)
  && clobber(o1)
  && clobber(o2)
  && clobber(o3)
  && clobber(o4)
  && clobber(o5)
  -> @mergePoint(b,x0,x1,x2,x3,x4,x5,x6,x7) (MOVDBRloadidx <v.Type> [i] {s} p idx mem)

// Big endian loads.

// b[1] | b[0]<<8 -> load 16-bit
(ORW                  x0:(MOVBZload [i]   {s} p mem)
    s0:(SLWconst [8] x1:(MOVBZload [i-1] {s} p mem)))
  && p.Op != OpSB
  && x0.Uses == 1
  && x1.Uses == 1
  && s0.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(s0)
  -> @mergePoint(b,x0,x1) (MOVHZload [i-1] {s} p mem)

// b[3] | b[2]<<8 | b[1]<<16 | b[0]<<24 -> load 32-bit
(ORW o0:(ORW x0:(MOVHZload [i] {s} p mem)
    s0:(SLWconst [16] x1:(MOVBZload [i-1] {s} p mem)))
    s1:(SLWconst [24] x2:(MOVBZload [i-2] {s} p mem)))
  && p.Op != OpSB
  && x0.Uses == 1
  && x1.Uses == 1
  && x2.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && o0.Uses == 1
  && mergePoint(b,x0,x1,x2) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(x2)
  && clobber(s0)
  && clobber(s1)
  && clobber(o0)
  -> @mergePoint(b,x0,x1,x2) (MOVWZload [i-2] {s} p mem)

// b[7] | b[6]<<8 | b[5]<<16 | b[4]<<24 | b[3]<<32 | b[2]<<40 | b[1]<<48 | b[0]<<56 -> load 64-bit
(OR o0:(OR o1:(OR o2:(OR o3:(OR o4:(OR o5:(OR
                      x0:(MOVBZload [i]   {s} p mem)
    s0:(SLDconst [8]  x1:(MOVBZload [i-1] {s} p mem)))
    s1:(SLDconst [16] x2:(MOVBZload [i-2] {s} p mem)))
    s2:(SLDconst [24] x3:(MOVBZload [i-3] {s} p mem)))
    s3:(SLDconst [32] x4:(MOVBZload [i-4] {s} p mem)))
    s4:(SLDconst [40] x5:(MOVBZload [i-5] {s} p mem)))
    s5:(SLDconst [48] x6:(MOVBZload [i-6] {s} p mem)))
    s6:(SLDconst [56] x7:(MOVBZload [i-7] {s} p mem)))
  && p.Op != OpSB
  && x0.Uses == 1
  && x1.Uses == 1
  && x2.Uses == 1
  && x3.Uses == 1
  && x4.Uses == 1
  && x5.Uses == 1
  && x6.Uses == 1
  && x7.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && s2.Uses == 1
  && s3.Uses == 1
  && s4.Uses == 1
  && s5.Uses == 1
  && s6.Uses == 1
  && o0.Uses == 1
  && o1.Uses == 1
  && o2.Uses == 1
  && o3.Uses == 1
  && o4.Uses == 1
  && o5.Uses == 1
  && mergePoint(b,x0,x1,x2,x3,x4,x5,x6,x7) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(x2)
  && clobber(x3)
  && clobber(x4)
  && clobber(x5)
  && clobber(x6)
  && clobber(x7)
  && clobber(s0)
  && clobber(s1)
  && clobber(s2)
  && clobber(s3)
  && clobber(s4)
  && clobber(s5)
  && clobber(s6)
  && clobber(o0)
  && clobber(o1)
  && clobber(o2)
  && clobber(o3)
  && clobber(o4)
  && clobber(o5)
  -> @mergePoint(b,x0,x1,x2,x3,x4,x5,x6,x7) (MOVDload [i-7] {s} p mem)

// b[1] | b[0]<<8 -> load 16-bit
(ORW                 x0:(MOVBZloadidx [i]   {s} p idx mem)
    s0:(SLWconst [8] x1:(MOVBZloadidx [i-1] {s} p idx mem)))
  && x0.Uses == 1
  && x1.Uses == 1
  && s0.Uses == 1
  && mergePoint(b,x0,x1) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(s0)
  -> @mergePoint(b,x0,x1) (MOVHZloadidx <v.Type> [i-1] {s} p idx mem)

// b[3] | b[2]<<8 | b[1]<<16 | b[0]<<24 -> load 32-bit
(ORW o0:(ORW x0:(MOVHZloadidx [i] {s} p idx mem)
    s0:(SLWconst [16] x1:(MOVBZloadidx [i-1] {s} p idx mem)))
    s1:(SLWconst [24] x2:(MOVBZloadidx [i-2] {s} p idx mem)))
  && x0.Uses == 1
  && x1.Uses == 1
  && x2.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && o0.Uses == 1
  && mergePoint(b,x0,x1,x2) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(x2)
  && clobber(s0)
  && clobber(s1)
  && clobber(o0)
  -> @mergePoint(b,x0,x1,x2) (MOVWZloadidx <v.Type> [i-2] {s} p idx mem)

// b[7] | b[6]<<8 | b[5]<<16 | b[4]<<24 | b[3]<<32 | b[2]<<40 | b[1]<<48 | b[0]<<56 -> load 64-bit
(OR o0:(OR o1:(OR o2:(OR o3:(OR o4:(OR o5:(OR
                      x0:(MOVBZloadidx [i]   {s} p idx mem)
    s0:(SLDconst [8]  x1:(MOVBZloadidx [i-1] {s} p idx mem)))
    s1:(SLDconst [16] x2:(MOVBZloadidx [i-2] {s} p idx mem)))
    s2:(SLDconst [24] x3:(MOVBZloadidx [i-3] {s} p idx mem)))
    s3:(SLDconst [32] x4:(MOVBZloadidx [i-4] {s} p idx mem)))
    s4:(SLDconst [40] x5:(MOVBZloadidx [i-5] {s} p idx mem)))
    s5:(SLDconst [48] x6:(MOVBZloadidx [i-6] {s} p idx mem)))
    s6:(SLDconst [56] x7:(MOVBZloadidx [i-7] {s} p idx mem)))
  && x0.Uses == 1
  && x1.Uses == 1
  && x2.Uses == 1
  && x3.Uses == 1
  && x4.Uses == 1
  && x5.Uses == 1
  && x6.Uses == 1
  && x7.Uses == 1
  && s0.Uses == 1
  && s1.Uses == 1
  && s2.Uses == 1
  && s3.Uses == 1
  && s4.Uses == 1
  && s5.Uses == 1
  && s6.Uses == 1
  && o0.Uses == 1
  && o1.Uses == 1
  && o2.Uses == 1
  && o3.Uses == 1
  && o4.Uses == 1
  && o5.Uses == 1
  && mergePoint(b,x0,x1,x2,x3,x4,x5,x6,x7) != nil
  && clobber(x0)
  && clobber(x1)
  && clobber(x2)
  && clobber(x3)
  && clobber(x4)
  && clobber(x5)
  && clobber(x6)
  && clobber(x7)
  && clobber(s0)
  && clobber(s1)
  && clobber(s2)
  && clobber(s3)
  && clobber(s4)
  && clobber(s5)
  && clobber(s6)
  && clobber(o0)
  && clobber(o1)
  && clobber(o2)
  && clobber(o3)
  && clobber(o4)
  && clobber(o5)
  -> @mergePoint(b,x0,x1,x2,x3,x4,x5,x6,x7) (MOVDloadidx <v.Type> [i-7] {s} p idx mem)

// Combine stores into store multiples.
// 32-bit
(MOVWstore [i] {s} p w1 x:(MOVWstore [i-4] {s} p w0 mem))
  && p.Op != OpSB
  && x.Uses == 1
  && is20Bit(i-4)
  && clobber(x)
  -> (STM2 [i-4] {s} p w0 w1 mem)
(MOVWstore [i] {s} p w2 x:(STM2 [i-8] {s} p w0 w1 mem))
  && x.Uses == 1
  && is20Bit(i-8)
  && clobber(x)
  -> (STM3 [i-8] {s} p w0 w1 w2 mem)
(MOVWstore [i] {s} p w3 x:(STM3 [i-12] {s} p w0 w1 w2 mem))
  && x.Uses == 1
  && is20Bit(i-12)
  && clobber(x)
  -> (STM4 [i-12] {s} p w0 w1 w2 w3 mem)
(STM2 [i] {s} p w2 w3 x:(STM2 [i-8] {s} p w0 w1 mem))
  && x.Uses == 1
  && is20Bit(i-8)
  && clobber(x)
  -> (STM4 [i-8] {s} p w0 w1 w2 w3 mem)
// 64-bit
(MOVDstore [i] {s} p w1 x:(MOVDstore [i-8] {s} p w0 mem))
  && p.Op != OpSB
  && x.Uses == 1
  && is20Bit(i-8)
  && clobber(x)
  -> (STMG2 [i-8] {s} p w0 w1 mem)
(MOVDstore [i] {s} p w2 x:(STMG2 [i-16] {s} p w0 w1 mem))
  && x.Uses == 1
  && is20Bit(i-16)
  && clobber(x)
  -> (STMG3 [i-16] {s} p w0 w1 w2 mem)
(MOVDstore [i] {s} p w3 x:(STMG3 [i-24] {s} p w0 w1 w2 mem))
  && x.Uses == 1
  && is20Bit(i-24)
  && clobber(x)
  -> (STMG4 [i-24] {s} p w0 w1 w2 w3 mem)
(STMG2 [i] {s} p w2 w3 x:(STMG2 [i-16] {s} p w0 w1 mem))
  && x.Uses == 1
  && is20Bit(i-16)
  && clobber(x)
  -> (STMG4 [i-16] {s} p w0 w1 w2 w3 mem)

// Convert 32-bit store multiples into 64-bit stores.
(STM2 [i] {s} p (SRDconst [32] x) x mem) -> (MOVDstore [i] {s} p x mem)