github.com/rakyll/go@v0.0.0-20170216000551-64c02460d703/src/cmd/compile/internal/ssa/gen/generic.rules (about) 1 // Copyright 2015 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // Simplifications that apply to all backend architectures. As an example, this 6 // Go source code 7 // 8 // y := 0 * x 9 // 10 // can be translated into y := 0 without losing any information, which saves a 11 // pointless multiplication instruction. Other .rules files in this directory 12 // (for example AMD64.rules) contain rules specific to the architecture in the 13 // filename. The rules here apply to every architecture. 14 // 15 // The code for parsing this file lives in rulegen.go; this file generates 16 // ssa/rewritegeneric.go. 17 18 // values are specified using the following format: 19 // (op <type> [auxint] {aux} arg0 arg1 ...) 20 // the type, aux, and auxint fields are optional 21 // on the matching side 22 // - the type, aux, and auxint fields must match if they are specified. 23 // - the first occurrence of a variable defines that variable. Subsequent 24 // uses must match (be == to) the first use. 25 // - v is defined to be the value matched. 26 // - an additional conditional can be provided after the match pattern with "&&". 27 // on the generated side 28 // - the type of the top-level expression is the same as the one on the left-hand side. 29 // - the type of any subexpressions must be specified explicitly (or 30 // be specified in the op's type field). 31 // - auxint will be 0 if not specified. 32 // - aux will be nil if not specified. 33 34 // blocks are specified using the following format: 35 // (kind controlvalue succ0 succ1 ...) 36 // controlvalue must be "nil" or a value expression 37 // succ* fields must be variables 38 // For now, the generated successors must be a permutation of the matched successors. 39 40 // constant folding 41 (Trunc16to8 (Const16 [c])) -> (Const8 [int64(int8(c))]) 42 (Trunc32to8 (Const32 [c])) -> (Const8 [int64(int8(c))]) 43 (Trunc32to16 (Const32 [c])) -> (Const16 [int64(int16(c))]) 44 (Trunc64to8 (Const64 [c])) -> (Const8 [int64(int8(c))]) 45 (Trunc64to16 (Const64 [c])) -> (Const16 [int64(int16(c))]) 46 (Trunc64to32 (Const64 [c])) -> (Const32 [int64(int32(c))]) 47 (Cvt64Fto32F (Const64F [c])) -> (Const32F [f2i(float64(i2f32(c)))]) 48 (Cvt32Fto64F (Const32F [c])) -> (Const64F [c]) // c is already a 64 bit float 49 50 (Trunc16to8 (ZeroExt8to16 x)) -> x 51 (Trunc32to8 (ZeroExt8to32 x)) -> x 52 (Trunc32to16 (ZeroExt8to32 x)) -> (ZeroExt8to16 x) 53 (Trunc32to16 (ZeroExt16to32 x)) -> x 54 (Trunc64to8 (ZeroExt8to64 x)) -> x 55 (Trunc64to16 (ZeroExt8to64 x)) -> (ZeroExt8to16 x) 56 (Trunc64to16 (ZeroExt16to64 x)) -> x 57 (Trunc64to32 (ZeroExt8to64 x)) -> (ZeroExt8to32 x) 58 (Trunc64to32 (ZeroExt16to64 x)) -> (ZeroExt16to32 x) 59 (Trunc64to32 (ZeroExt32to64 x)) -> x 60 (Trunc16to8 (SignExt8to16 x)) -> x 61 (Trunc32to8 (SignExt8to32 x)) -> x 62 (Trunc32to16 (SignExt8to32 x)) -> (SignExt8to16 x) 63 (Trunc32to16 (SignExt16to32 x)) -> x 64 (Trunc64to8 (SignExt8to64 x)) -> x 65 (Trunc64to16 (SignExt8to64 x)) -> (SignExt8to16 x) 66 (Trunc64to16 (SignExt16to64 x)) -> x 67 (Trunc64to32 (SignExt8to64 x)) -> (SignExt8to32 x) 68 (Trunc64to32 (SignExt16to64 x)) -> (SignExt16to32 x) 69 (Trunc64to32 (SignExt32to64 x)) -> x 70 71 (ZeroExt8to16 (Const8 [c])) -> (Const16 [int64( uint8(c))]) 72 (ZeroExt8to32 (Const8 [c])) -> (Const32 [int64( uint8(c))]) 73 (ZeroExt8to64 (Const8 [c])) -> (Const64 [int64( uint8(c))]) 74 (ZeroExt16to32 (Const16 [c])) -> (Const32 [int64(uint16(c))]) 75 (ZeroExt16to64 (Const16 [c])) -> (Const64 [int64(uint16(c))]) 76 (ZeroExt32to64 (Const32 [c])) -> (Const64 [int64(uint32(c))]) 77 (SignExt8to16 (Const8 [c])) -> (Const16 [int64( int8(c))]) 78 (SignExt8to32 (Const8 [c])) -> (Const32 [int64( int8(c))]) 79 (SignExt8to64 (Const8 [c])) -> (Const64 [int64( int8(c))]) 80 (SignExt16to32 (Const16 [c])) -> (Const32 [int64( int16(c))]) 81 (SignExt16to64 (Const16 [c])) -> (Const64 [int64( int16(c))]) 82 (SignExt32to64 (Const32 [c])) -> (Const64 [int64( int32(c))]) 83 84 // const negation is currently handled by frontend 85 //(Neg8 (Const8 [c])) -> (Const8 [-c]) 86 //(Neg16 (Const16 [c])) -> (Const16 [-c]) 87 //(Neg32 (Const32 [c])) -> (Const32 [-c]) 88 //(Neg64 (Const64 [c])) -> (Const64 [-c]) 89 //(Neg32F (Const32F [c])) -> (Const32F [f2i(-i2f(c))]) 90 //(Neg64F (Const64F [c])) -> (Const64F [f2i(-i2f(c))]) 91 92 (Add8 (Const8 [c]) (Const8 [d])) -> (Const8 [int64(int8(c+d))]) 93 (Add16 (Const16 [c]) (Const16 [d])) -> (Const16 [int64(int16(c+d))]) 94 (Add32 (Const32 [c]) (Const32 [d])) -> (Const32 [int64(int32(c+d))]) 95 (Add64 (Const64 [c]) (Const64 [d])) -> (Const64 [c+d]) 96 (Add32F (Const32F [c]) (Const32F [d])) -> 97 (Const32F [f2i(float64(i2f32(c) + i2f32(d)))]) // ensure we combine the operands with 32 bit precision 98 (Add64F (Const64F [c]) (Const64F [d])) -> (Const64F [f2i(i2f(c) + i2f(d))]) 99 (AddPtr <t> x (Const64 [c])) -> (OffPtr <t> x [c]) 100 101 (Sub8 (Const8 [c]) (Const8 [d])) -> (Const8 [int64(int8(c-d))]) 102 (Sub16 (Const16 [c]) (Const16 [d])) -> (Const16 [int64(int16(c-d))]) 103 (Sub32 (Const32 [c]) (Const32 [d])) -> (Const32 [int64(int32(c-d))]) 104 (Sub64 (Const64 [c]) (Const64 [d])) -> (Const64 [c-d]) 105 (Sub32F (Const32F [c]) (Const32F [d])) -> 106 (Const32F [f2i(float64(i2f32(c) - i2f32(d)))]) 107 (Sub64F (Const64F [c]) (Const64F [d])) -> (Const64F [f2i(i2f(c) - i2f(d))]) 108 109 (Mul8 (Const8 [c]) (Const8 [d])) -> (Const8 [int64(int8(c*d))]) 110 (Mul16 (Const16 [c]) (Const16 [d])) -> (Const16 [int64(int16(c*d))]) 111 (Mul32 (Const32 [c]) (Const32 [d])) -> (Const32 [int64(int32(c*d))]) 112 (Mul64 (Const64 [c]) (Const64 [d])) -> (Const64 [c*d]) 113 (Mul32F (Const32F [c]) (Const32F [d])) -> 114 (Const32F [f2i(float64(i2f32(c) * i2f32(d)))]) 115 (Mul64F (Const64F [c]) (Const64F [d])) -> (Const64F [f2i(i2f(c) * i2f(d))]) 116 117 // Convert x * -1 to -x. The front-end catches some but not all of these. 118 (Mul8 (Const8 [-1]) x) -> (Neg8 x) 119 (Mul16 (Const16 [-1]) x) -> (Neg16 x) 120 (Mul32 (Const32 [-1]) x) -> (Neg32 x) 121 (Mul64 (Const64 [-1]) x) -> (Neg64 x) 122 123 // Convert multiplication by a power of two to a shift. 124 (Mul8 <t> n (Const8 [c])) && isPowerOfTwo(c) -> (Lsh8x64 <t> n (Const64 <config.fe.TypeUInt64()> [log2(c)])) 125 (Mul16 <t> n (Const16 [c])) && isPowerOfTwo(c) -> (Lsh16x64 <t> n (Const64 <config.fe.TypeUInt64()> [log2(c)])) 126 (Mul32 <t> n (Const32 [c])) && isPowerOfTwo(c) -> (Lsh32x64 <t> n (Const64 <config.fe.TypeUInt64()> [log2(c)])) 127 (Mul64 <t> n (Const64 [c])) && isPowerOfTwo(c) -> (Lsh64x64 <t> n (Const64 <config.fe.TypeUInt64()> [log2(c)])) 128 (Mul8 <t> n (Const8 [c])) && t.IsSigned() && isPowerOfTwo(-c) -> (Neg8 (Lsh8x64 <t> n (Const64 <config.fe.TypeUInt64()> [log2(-c)]))) 129 (Mul16 <t> n (Const16 [c])) && t.IsSigned() && isPowerOfTwo(-c) -> (Neg16 (Lsh16x64 <t> n (Const64 <config.fe.TypeUInt64()> [log2(-c)]))) 130 (Mul32 <t> n (Const32 [c])) && t.IsSigned() && isPowerOfTwo(-c) -> (Neg32 (Lsh32x64 <t> n (Const64 <config.fe.TypeUInt64()> [log2(-c)]))) 131 (Mul64 <t> n (Const64 [c])) && t.IsSigned() && isPowerOfTwo(-c) -> (Neg64 (Lsh64x64 <t> n (Const64 <config.fe.TypeUInt64()> [log2(-c)]))) 132 133 (Mod8 (Const8 [c]) (Const8 [d])) && d != 0 -> (Const8 [int64(int8(c % d))]) 134 (Mod16 (Const16 [c]) (Const16 [d])) && d != 0 -> (Const16 [int64(int16(c % d))]) 135 (Mod32 (Const32 [c]) (Const32 [d])) && d != 0 -> (Const32 [int64(int32(c % d))]) 136 (Mod64 (Const64 [c]) (Const64 [d])) && d != 0 -> (Const64 [c % d]) 137 138 (Mod8u (Const8 [c]) (Const8 [d])) && d != 0 -> (Const8 [int64(uint8(c) % uint8(d))]) 139 (Mod16u (Const16 [c]) (Const16 [d])) && d != 0 -> (Const16 [int64(uint16(c) % uint16(d))]) 140 (Mod32u (Const32 [c]) (Const32 [d])) && d != 0 -> (Const32 [int64(uint32(c) % uint32(d))]) 141 (Mod64u (Const64 [c]) (Const64 [d])) && d != 0 -> (Const64 [int64(uint64(c) % uint64(d))]) 142 143 (Lsh64x64 (Const64 [c]) (Const64 [d])) -> (Const64 [c << uint64(d)]) 144 (Rsh64x64 (Const64 [c]) (Const64 [d])) -> (Const64 [c >> uint64(d)]) 145 (Rsh64Ux64 (Const64 [c]) (Const64 [d])) -> (Const64 [int64(uint64(c) >> uint64(d))]) 146 (Lsh32x64 (Const32 [c]) (Const64 [d])) -> (Const32 [int64(int32(c) << uint64(d))]) 147 (Rsh32x64 (Const32 [c]) (Const64 [d])) -> (Const32 [int64(int32(c) >> uint64(d))]) 148 (Rsh32Ux64 (Const32 [c]) (Const64 [d])) -> (Const32 [int64(int32(uint32(c) >> uint64(d)))]) 149 (Lsh16x64 (Const16 [c]) (Const64 [d])) -> (Const16 [int64(int16(c) << uint64(d))]) 150 (Rsh16x64 (Const16 [c]) (Const64 [d])) -> (Const16 [int64(int16(c) >> uint64(d))]) 151 (Rsh16Ux64 (Const16 [c]) (Const64 [d])) -> (Const16 [int64(int16(uint16(c) >> uint64(d)))]) 152 (Lsh8x64 (Const8 [c]) (Const64 [d])) -> (Const8 [int64(int8(c) << uint64(d))]) 153 (Rsh8x64 (Const8 [c]) (Const64 [d])) -> (Const8 [int64(int8(c) >> uint64(d))]) 154 (Rsh8Ux64 (Const8 [c]) (Const64 [d])) -> (Const8 [int64(int8(uint8(c) >> uint64(d)))]) 155 156 // Fold IsInBounds when the range of the index cannot exceed the limit. 157 (IsInBounds (ZeroExt8to32 _) (Const32 [c])) && (1 << 8) <= c -> (ConstBool [1]) 158 (IsInBounds (ZeroExt8to64 _) (Const64 [c])) && (1 << 8) <= c -> (ConstBool [1]) 159 (IsInBounds (ZeroExt16to32 _) (Const32 [c])) && (1 << 16) <= c -> (ConstBool [1]) 160 (IsInBounds (ZeroExt16to64 _) (Const64 [c])) && (1 << 16) <= c -> (ConstBool [1]) 161 (IsInBounds x x) -> (ConstBool [0]) 162 (IsInBounds (And32 (Const32 [c]) _) (Const32 [d])) && 0 <= c && c < d -> (ConstBool [1]) 163 (IsInBounds (And64 (Const64 [c]) _) (Const64 [d])) && 0 <= c && c < d -> (ConstBool [1]) 164 (IsInBounds (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(0 <= c && c < d)]) 165 (IsInBounds (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(0 <= c && c < d)]) 166 // (Mod64u x y) is always between 0 (inclusive) and y (exclusive). 167 (IsInBounds (Mod32u _ y) y) -> (ConstBool [1]) 168 (IsInBounds (Mod64u _ y) y) -> (ConstBool [1]) 169 170 (IsSliceInBounds x x) -> (ConstBool [1]) 171 (IsSliceInBounds (And32 (Const32 [c]) _) (Const32 [d])) && 0 <= c && c <= d -> (ConstBool [1]) 172 (IsSliceInBounds (And64 (Const64 [c]) _) (Const64 [d])) && 0 <= c && c <= d -> (ConstBool [1]) 173 (IsSliceInBounds (Const32 [0]) _) -> (ConstBool [1]) 174 (IsSliceInBounds (Const64 [0]) _) -> (ConstBool [1]) 175 (IsSliceInBounds (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(0 <= c && c <= d)]) 176 (IsSliceInBounds (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(0 <= c && c <= d)]) 177 (IsSliceInBounds (SliceLen x) (SliceCap x)) -> (ConstBool [1]) 178 179 (Eq64 x x) -> (ConstBool [1]) 180 (Eq32 x x) -> (ConstBool [1]) 181 (Eq16 x x) -> (ConstBool [1]) 182 (Eq8 x x) -> (ConstBool [1]) 183 (EqB (ConstBool [c]) (ConstBool [d])) -> (ConstBool [b2i(c == d)]) 184 (EqB (ConstBool [0]) x) -> (Not x) 185 (EqB (ConstBool [1]) x) -> x 186 187 (Neq64 x x) -> (ConstBool [0]) 188 (Neq32 x x) -> (ConstBool [0]) 189 (Neq16 x x) -> (ConstBool [0]) 190 (Neq8 x x) -> (ConstBool [0]) 191 (NeqB (ConstBool [c]) (ConstBool [d])) -> (ConstBool [b2i(c != d)]) 192 (NeqB (ConstBool [0]) x) -> x 193 (NeqB (ConstBool [1]) x) -> (Not x) 194 195 (Eq64 (Const64 <t> [c]) (Add64 (Const64 <t> [d]) x)) -> (Eq64 (Const64 <t> [c-d]) x) 196 (Eq32 (Const32 <t> [c]) (Add32 (Const32 <t> [d]) x)) -> (Eq32 (Const32 <t> [int64(int32(c-d))]) x) 197 (Eq16 (Const16 <t> [c]) (Add16 (Const16 <t> [d]) x)) -> (Eq16 (Const16 <t> [int64(int16(c-d))]) x) 198 (Eq8 (Const8 <t> [c]) (Add8 (Const8 <t> [d]) x)) -> (Eq8 (Const8 <t> [int64(int8(c-d))]) x) 199 200 (Neq64 (Const64 <t> [c]) (Add64 (Const64 <t> [d]) x)) -> (Neq64 (Const64 <t> [c-d]) x) 201 (Neq32 (Const32 <t> [c]) (Add32 (Const32 <t> [d]) x)) -> (Neq32 (Const32 <t> [int64(int32(c-d))]) x) 202 (Neq16 (Const16 <t> [c]) (Add16 (Const16 <t> [d]) x)) -> (Neq16 (Const16 <t> [int64(int16(c-d))]) x) 203 (Neq8 (Const8 <t> [c]) (Add8 (Const8 <t> [d]) x)) -> (Neq8 (Const8 <t> [int64(int8(c-d))]) x) 204 205 // canonicalize: swap arguments for commutative operations when one argument is a constant. 206 (Eq64 x (Const64 <t> [c])) && x.Op != OpConst64 -> (Eq64 (Const64 <t> [c]) x) 207 (Eq32 x (Const32 <t> [c])) && x.Op != OpConst32 -> (Eq32 (Const32 <t> [c]) x) 208 (Eq16 x (Const16 <t> [c])) && x.Op != OpConst16 -> (Eq16 (Const16 <t> [c]) x) 209 (Eq8 x (Const8 <t> [c])) && x.Op != OpConst8 -> (Eq8 (Const8 <t> [c]) x) 210 211 (Neq64 x (Const64 <t> [c])) && x.Op != OpConst64 -> (Neq64 (Const64 <t> [c]) x) 212 (Neq32 x (Const32 <t> [c])) && x.Op != OpConst32 -> (Neq32 (Const32 <t> [c]) x) 213 (Neq16 x (Const16 <t> [c])) && x.Op != OpConst16 -> (Neq16 (Const16 <t> [c]) x) 214 (Neq8 x (Const8 <t> [c])) && x.Op != OpConst8 -> (Neq8 (Const8 <t> [c]) x) 215 216 // AddPtr is not canonicalized because nilcheck ptr checks the first argument to be non-nil. 217 (Add64 x (Const64 <t> [c])) && x.Op != OpConst64 -> (Add64 (Const64 <t> [c]) x) 218 (Add32 x (Const32 <t> [c])) && x.Op != OpConst32 -> (Add32 (Const32 <t> [c]) x) 219 (Add16 x (Const16 <t> [c])) && x.Op != OpConst16 -> (Add16 (Const16 <t> [c]) x) 220 (Add8 x (Const8 <t> [c])) && x.Op != OpConst8 -> (Add8 (Const8 <t> [c]) x) 221 222 (Mul64 x (Const64 <t> [c])) && x.Op != OpConst64 -> (Mul64 (Const64 <t> [c]) x) 223 (Mul32 x (Const32 <t> [c])) && x.Op != OpConst32 -> (Mul32 (Const32 <t> [c]) x) 224 (Mul16 x (Const16 <t> [c])) && x.Op != OpConst16 -> (Mul16 (Const16 <t> [c]) x) 225 (Mul8 x (Const8 <t> [c])) && x.Op != OpConst8 -> (Mul8 (Const8 <t> [c]) x) 226 227 (Sub64 x (Const64 <t> [c])) && x.Op != OpConst64 -> (Add64 (Const64 <t> [-c]) x) 228 (Sub32 x (Const32 <t> [c])) && x.Op != OpConst32 -> (Add32 (Const32 <t> [int64(int32(-c))]) x) 229 (Sub16 x (Const16 <t> [c])) && x.Op != OpConst16 -> (Add16 (Const16 <t> [int64(int16(-c))]) x) 230 (Sub8 x (Const8 <t> [c])) && x.Op != OpConst8 -> (Add8 (Const8 <t> [int64(int8(-c))]) x) 231 232 (And64 x (Const64 <t> [c])) && x.Op != OpConst64 -> (And64 (Const64 <t> [c]) x) 233 (And32 x (Const32 <t> [c])) && x.Op != OpConst32 -> (And32 (Const32 <t> [c]) x) 234 (And16 x (Const16 <t> [c])) && x.Op != OpConst16 -> (And16 (Const16 <t> [c]) x) 235 (And8 x (Const8 <t> [c])) && x.Op != OpConst8 -> (And8 (Const8 <t> [c]) x) 236 237 (Or64 x (Const64 <t> [c])) && x.Op != OpConst64 -> (Or64 (Const64 <t> [c]) x) 238 (Or32 x (Const32 <t> [c])) && x.Op != OpConst32 -> (Or32 (Const32 <t> [c]) x) 239 (Or16 x (Const16 <t> [c])) && x.Op != OpConst16 -> (Or16 (Const16 <t> [c]) x) 240 (Or8 x (Const8 <t> [c])) && x.Op != OpConst8 -> (Or8 (Const8 <t> [c]) x) 241 242 (Xor64 x (Const64 <t> [c])) && x.Op != OpConst64 -> (Xor64 (Const64 <t> [c]) x) 243 (Xor32 x (Const32 <t> [c])) && x.Op != OpConst32 -> (Xor32 (Const32 <t> [c]) x) 244 (Xor16 x (Const16 <t> [c])) && x.Op != OpConst16 -> (Xor16 (Const16 <t> [c]) x) 245 (Xor8 x (Const8 <t> [c])) && x.Op != OpConst8 -> (Xor8 (Const8 <t> [c]) x) 246 247 // fold negation into comparison operators 248 (Not (Eq64 x y)) -> (Neq64 x y) 249 (Not (Eq32 x y)) -> (Neq32 x y) 250 (Not (Eq16 x y)) -> (Neq16 x y) 251 (Not (Eq8 x y)) -> (Neq8 x y) 252 (Not (EqB x y)) -> (NeqB x y) 253 254 (Not (Neq64 x y)) -> (Eq64 x y) 255 (Not (Neq32 x y)) -> (Eq32 x y) 256 (Not (Neq16 x y)) -> (Eq16 x y) 257 (Not (Neq8 x y)) -> (Eq8 x y) 258 (Not (NeqB x y)) -> (EqB x y) 259 260 (Not (Greater64 x y)) -> (Leq64 x y) 261 (Not (Greater32 x y)) -> (Leq32 x y) 262 (Not (Greater16 x y)) -> (Leq16 x y) 263 (Not (Greater8 x y)) -> (Leq8 x y) 264 265 (Not (Greater64U x y)) -> (Leq64U x y) 266 (Not (Greater32U x y)) -> (Leq32U x y) 267 (Not (Greater16U x y)) -> (Leq16U x y) 268 (Not (Greater8U x y)) -> (Leq8U x y) 269 270 (Not (Geq64 x y)) -> (Less64 x y) 271 (Not (Geq32 x y)) -> (Less32 x y) 272 (Not (Geq16 x y)) -> (Less16 x y) 273 (Not (Geq8 x y)) -> (Less8 x y) 274 275 (Not (Geq64U x y)) -> (Less64U x y) 276 (Not (Geq32U x y)) -> (Less32U x y) 277 (Not (Geq16U x y)) -> (Less16U x y) 278 (Not (Geq8U x y)) -> (Less8U x y) 279 280 (Not (Less64 x y)) -> (Geq64 x y) 281 (Not (Less32 x y)) -> (Geq32 x y) 282 (Not (Less16 x y)) -> (Geq16 x y) 283 (Not (Less8 x y)) -> (Geq8 x y) 284 285 (Not (Less64U x y)) -> (Geq64U x y) 286 (Not (Less32U x y)) -> (Geq32U x y) 287 (Not (Less16U x y)) -> (Geq16U x y) 288 (Not (Less8U x y)) -> (Geq8U x y) 289 290 (Not (Leq64 x y)) -> (Greater64 x y) 291 (Not (Leq32 x y)) -> (Greater32 x y) 292 (Not (Leq16 x y)) -> (Greater16 x y) 293 (Not (Leq8 x y)) -> (Greater8 x y) 294 295 (Not (Leq64U x y)) -> (Greater64U x y) 296 (Not (Leq32U x y)) -> (Greater32U x y) 297 (Not (Leq16U x y)) -> (Greater16U x y) 298 (Not (Leq8U x y)) -> (Greater8U x y) 299 300 // Distribute multiplication c * (d+x) -> c*d + c*x. Useful for: 301 // a[i].b = ...; a[i+1].b = ... 302 (Mul64 (Const64 <t> [c]) (Add64 <t> (Const64 <t> [d]) x)) -> 303 (Add64 (Const64 <t> [c*d]) (Mul64 <t> (Const64 <t> [c]) x)) 304 (Mul32 (Const32 <t> [c]) (Add32 <t> (Const32 <t> [d]) x)) -> 305 (Add32 (Const32 <t> [int64(int32(c*d))]) (Mul32 <t> (Const32 <t> [c]) x)) 306 307 // rewrite shifts of 8/16/32 bit consts into 64 bit consts to reduce 308 // the number of the other rewrite rules for const shifts 309 (Lsh64x32 <t> x (Const32 [c])) -> (Lsh64x64 x (Const64 <t> [int64(uint32(c))])) 310 (Lsh64x16 <t> x (Const16 [c])) -> (Lsh64x64 x (Const64 <t> [int64(uint16(c))])) 311 (Lsh64x8 <t> x (Const8 [c])) -> (Lsh64x64 x (Const64 <t> [int64(uint8(c))])) 312 (Rsh64x32 <t> x (Const32 [c])) -> (Rsh64x64 x (Const64 <t> [int64(uint32(c))])) 313 (Rsh64x16 <t> x (Const16 [c])) -> (Rsh64x64 x (Const64 <t> [int64(uint16(c))])) 314 (Rsh64x8 <t> x (Const8 [c])) -> (Rsh64x64 x (Const64 <t> [int64(uint8(c))])) 315 (Rsh64Ux32 <t> x (Const32 [c])) -> (Rsh64Ux64 x (Const64 <t> [int64(uint32(c))])) 316 (Rsh64Ux16 <t> x (Const16 [c])) -> (Rsh64Ux64 x (Const64 <t> [int64(uint16(c))])) 317 (Rsh64Ux8 <t> x (Const8 [c])) -> (Rsh64Ux64 x (Const64 <t> [int64(uint8(c))])) 318 319 (Lsh32x32 <t> x (Const32 [c])) -> (Lsh32x64 x (Const64 <t> [int64(uint32(c))])) 320 (Lsh32x16 <t> x (Const16 [c])) -> (Lsh32x64 x (Const64 <t> [int64(uint16(c))])) 321 (Lsh32x8 <t> x (Const8 [c])) -> (Lsh32x64 x (Const64 <t> [int64(uint8(c))])) 322 (Rsh32x32 <t> x (Const32 [c])) -> (Rsh32x64 x (Const64 <t> [int64(uint32(c))])) 323 (Rsh32x16 <t> x (Const16 [c])) -> (Rsh32x64 x (Const64 <t> [int64(uint16(c))])) 324 (Rsh32x8 <t> x (Const8 [c])) -> (Rsh32x64 x (Const64 <t> [int64(uint8(c))])) 325 (Rsh32Ux32 <t> x (Const32 [c])) -> (Rsh32Ux64 x (Const64 <t> [int64(uint32(c))])) 326 (Rsh32Ux16 <t> x (Const16 [c])) -> (Rsh32Ux64 x (Const64 <t> [int64(uint16(c))])) 327 (Rsh32Ux8 <t> x (Const8 [c])) -> (Rsh32Ux64 x (Const64 <t> [int64(uint8(c))])) 328 329 (Lsh16x32 <t> x (Const32 [c])) -> (Lsh16x64 x (Const64 <t> [int64(uint32(c))])) 330 (Lsh16x16 <t> x (Const16 [c])) -> (Lsh16x64 x (Const64 <t> [int64(uint16(c))])) 331 (Lsh16x8 <t> x (Const8 [c])) -> (Lsh16x64 x (Const64 <t> [int64(uint8(c))])) 332 (Rsh16x32 <t> x (Const32 [c])) -> (Rsh16x64 x (Const64 <t> [int64(uint32(c))])) 333 (Rsh16x16 <t> x (Const16 [c])) -> (Rsh16x64 x (Const64 <t> [int64(uint16(c))])) 334 (Rsh16x8 <t> x (Const8 [c])) -> (Rsh16x64 x (Const64 <t> [int64(uint8(c))])) 335 (Rsh16Ux32 <t> x (Const32 [c])) -> (Rsh16Ux64 x (Const64 <t> [int64(uint32(c))])) 336 (Rsh16Ux16 <t> x (Const16 [c])) -> (Rsh16Ux64 x (Const64 <t> [int64(uint16(c))])) 337 (Rsh16Ux8 <t> x (Const8 [c])) -> (Rsh16Ux64 x (Const64 <t> [int64(uint8(c))])) 338 339 (Lsh8x32 <t> x (Const32 [c])) -> (Lsh8x64 x (Const64 <t> [int64(uint32(c))])) 340 (Lsh8x16 <t> x (Const16 [c])) -> (Lsh8x64 x (Const64 <t> [int64(uint16(c))])) 341 (Lsh8x8 <t> x (Const8 [c])) -> (Lsh8x64 x (Const64 <t> [int64(uint8(c))])) 342 (Rsh8x32 <t> x (Const32 [c])) -> (Rsh8x64 x (Const64 <t> [int64(uint32(c))])) 343 (Rsh8x16 <t> x (Const16 [c])) -> (Rsh8x64 x (Const64 <t> [int64(uint16(c))])) 344 (Rsh8x8 <t> x (Const8 [c])) -> (Rsh8x64 x (Const64 <t> [int64(uint8(c))])) 345 (Rsh8Ux32 <t> x (Const32 [c])) -> (Rsh8Ux64 x (Const64 <t> [int64(uint32(c))])) 346 (Rsh8Ux16 <t> x (Const16 [c])) -> (Rsh8Ux64 x (Const64 <t> [int64(uint16(c))])) 347 (Rsh8Ux8 <t> x (Const8 [c])) -> (Rsh8Ux64 x (Const64 <t> [int64(uint8(c))])) 348 349 // shifts by zero 350 (Lsh64x64 x (Const64 [0])) -> x 351 (Rsh64x64 x (Const64 [0])) -> x 352 (Rsh64Ux64 x (Const64 [0])) -> x 353 (Lsh32x64 x (Const64 [0])) -> x 354 (Rsh32x64 x (Const64 [0])) -> x 355 (Rsh32Ux64 x (Const64 [0])) -> x 356 (Lsh16x64 x (Const64 [0])) -> x 357 (Rsh16x64 x (Const64 [0])) -> x 358 (Rsh16Ux64 x (Const64 [0])) -> x 359 (Lsh8x64 x (Const64 [0])) -> x 360 (Rsh8x64 x (Const64 [0])) -> x 361 (Rsh8Ux64 x (Const64 [0])) -> x 362 363 // zero shifted. 364 (Lsh64x64 (Const64 [0]) _) -> (Const64 [0]) 365 (Lsh64x32 (Const64 [0]) _) -> (Const64 [0]) 366 (Lsh64x16 (Const64 [0]) _) -> (Const64 [0]) 367 (Lsh64x8 (Const64 [0]) _) -> (Const64 [0]) 368 (Rsh64x64 (Const64 [0]) _) -> (Const64 [0]) 369 (Rsh64x32 (Const64 [0]) _) -> (Const64 [0]) 370 (Rsh64x16 (Const64 [0]) _) -> (Const64 [0]) 371 (Rsh64x8 (Const64 [0]) _) -> (Const64 [0]) 372 (Rsh64Ux64 (Const64 [0]) _) -> (Const64 [0]) 373 (Rsh64Ux32 (Const64 [0]) _) -> (Const64 [0]) 374 (Rsh64Ux16 (Const64 [0]) _) -> (Const64 [0]) 375 (Rsh64Ux8 (Const64 [0]) _) -> (Const64 [0]) 376 (Lsh32x64 (Const32 [0]) _) -> (Const32 [0]) 377 (Lsh32x32 (Const32 [0]) _) -> (Const32 [0]) 378 (Lsh32x16 (Const32 [0]) _) -> (Const32 [0]) 379 (Lsh32x8 (Const32 [0]) _) -> (Const32 [0]) 380 (Rsh32x64 (Const32 [0]) _) -> (Const32 [0]) 381 (Rsh32x32 (Const32 [0]) _) -> (Const32 [0]) 382 (Rsh32x16 (Const32 [0]) _) -> (Const32 [0]) 383 (Rsh32x8 (Const32 [0]) _) -> (Const32 [0]) 384 (Rsh32Ux64 (Const32 [0]) _) -> (Const32 [0]) 385 (Rsh32Ux32 (Const32 [0]) _) -> (Const32 [0]) 386 (Rsh32Ux16 (Const32 [0]) _) -> (Const32 [0]) 387 (Rsh32Ux8 (Const32 [0]) _) -> (Const32 [0]) 388 (Lsh16x64 (Const16 [0]) _) -> (Const16 [0]) 389 (Lsh16x32 (Const16 [0]) _) -> (Const16 [0]) 390 (Lsh16x16 (Const16 [0]) _) -> (Const16 [0]) 391 (Lsh16x8 (Const16 [0]) _) -> (Const16 [0]) 392 (Rsh16x64 (Const16 [0]) _) -> (Const16 [0]) 393 (Rsh16x32 (Const16 [0]) _) -> (Const16 [0]) 394 (Rsh16x16 (Const16 [0]) _) -> (Const16 [0]) 395 (Rsh16x8 (Const16 [0]) _) -> (Const16 [0]) 396 (Rsh16Ux64 (Const16 [0]) _) -> (Const16 [0]) 397 (Rsh16Ux32 (Const16 [0]) _) -> (Const16 [0]) 398 (Rsh16Ux16 (Const16 [0]) _) -> (Const16 [0]) 399 (Rsh16Ux8 (Const16 [0]) _) -> (Const16 [0]) 400 (Lsh8x64 (Const8 [0]) _) -> (Const8 [0]) 401 (Lsh8x32 (Const8 [0]) _) -> (Const8 [0]) 402 (Lsh8x16 (Const8 [0]) _) -> (Const8 [0]) 403 (Lsh8x8 (Const8 [0]) _) -> (Const8 [0]) 404 (Rsh8x64 (Const8 [0]) _) -> (Const8 [0]) 405 (Rsh8x32 (Const8 [0]) _) -> (Const8 [0]) 406 (Rsh8x16 (Const8 [0]) _) -> (Const8 [0]) 407 (Rsh8x8 (Const8 [0]) _) -> (Const8 [0]) 408 (Rsh8Ux64 (Const8 [0]) _) -> (Const8 [0]) 409 (Rsh8Ux32 (Const8 [0]) _) -> (Const8 [0]) 410 (Rsh8Ux16 (Const8 [0]) _) -> (Const8 [0]) 411 (Rsh8Ux8 (Const8 [0]) _) -> (Const8 [0]) 412 413 // large left shifts of all values, and right shifts of unsigned values 414 (Lsh64x64 _ (Const64 [c])) && uint64(c) >= 64 -> (Const64 [0]) 415 (Rsh64Ux64 _ (Const64 [c])) && uint64(c) >= 64 -> (Const64 [0]) 416 (Lsh32x64 _ (Const64 [c])) && uint64(c) >= 32 -> (Const32 [0]) 417 (Rsh32Ux64 _ (Const64 [c])) && uint64(c) >= 32 -> (Const32 [0]) 418 (Lsh16x64 _ (Const64 [c])) && uint64(c) >= 16 -> (Const16 [0]) 419 (Rsh16Ux64 _ (Const64 [c])) && uint64(c) >= 16 -> (Const16 [0]) 420 (Lsh8x64 _ (Const64 [c])) && uint64(c) >= 8 -> (Const8 [0]) 421 (Rsh8Ux64 _ (Const64 [c])) && uint64(c) >= 8 -> (Const8 [0]) 422 423 // combine const shifts 424 (Lsh64x64 <t> (Lsh64x64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Lsh64x64 x (Const64 <t> [c+d])) 425 (Lsh32x64 <t> (Lsh32x64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Lsh32x64 x (Const64 <t> [c+d])) 426 (Lsh16x64 <t> (Lsh16x64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Lsh16x64 x (Const64 <t> [c+d])) 427 (Lsh8x64 <t> (Lsh8x64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Lsh8x64 x (Const64 <t> [c+d])) 428 429 (Rsh64x64 <t> (Rsh64x64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Rsh64x64 x (Const64 <t> [c+d])) 430 (Rsh32x64 <t> (Rsh32x64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Rsh32x64 x (Const64 <t> [c+d])) 431 (Rsh16x64 <t> (Rsh16x64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Rsh16x64 x (Const64 <t> [c+d])) 432 (Rsh8x64 <t> (Rsh8x64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Rsh8x64 x (Const64 <t> [c+d])) 433 434 (Rsh64Ux64 <t> (Rsh64Ux64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Rsh64Ux64 x (Const64 <t> [c+d])) 435 (Rsh32Ux64 <t> (Rsh32Ux64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Rsh32Ux64 x (Const64 <t> [c+d])) 436 (Rsh16Ux64 <t> (Rsh16Ux64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Rsh16Ux64 x (Const64 <t> [c+d])) 437 (Rsh8Ux64 <t> (Rsh8Ux64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Rsh8Ux64 x (Const64 <t> [c+d])) 438 439 // ((x >> c1) << c2) >> c3 440 (Rsh64Ux64 (Lsh64x64 (Rsh64Ux64 x (Const64 [c1])) (Const64 [c2])) (Const64 [c3])) 441 && uint64(c1) >= uint64(c2) && uint64(c3) >= uint64(c2) && !uaddOvf(c1-c2, c3) 442 -> (Rsh64Ux64 x (Const64 <config.fe.TypeUInt64()> [c1-c2+c3])) 443 (Rsh32Ux64 (Lsh32x64 (Rsh32Ux64 x (Const64 [c1])) (Const64 [c2])) (Const64 [c3])) 444 && uint64(c1) >= uint64(c2) && uint64(c3) >= uint64(c2) && !uaddOvf(c1-c2, c3) 445 -> (Rsh32Ux64 x (Const64 <config.fe.TypeUInt64()> [c1-c2+c3])) 446 (Rsh16Ux64 (Lsh16x64 (Rsh16Ux64 x (Const64 [c1])) (Const64 [c2])) (Const64 [c3])) 447 && uint64(c1) >= uint64(c2) && uint64(c3) >= uint64(c2) && !uaddOvf(c1-c2, c3) 448 -> (Rsh16Ux64 x (Const64 <config.fe.TypeUInt64()> [c1-c2+c3])) 449 (Rsh8Ux64 (Lsh8x64 (Rsh8Ux64 x (Const64 [c1])) (Const64 [c2])) (Const64 [c3])) 450 && uint64(c1) >= uint64(c2) && uint64(c3) >= uint64(c2) && !uaddOvf(c1-c2, c3) 451 -> (Rsh8Ux64 x (Const64 <config.fe.TypeUInt64()> [c1-c2+c3])) 452 453 // ((x << c1) >> c2) << c3 454 (Lsh64x64 (Rsh64Ux64 (Lsh64x64 x (Const64 [c1])) (Const64 [c2])) (Const64 [c3])) 455 && uint64(c1) >= uint64(c2) && uint64(c3) >= uint64(c2) && !uaddOvf(c1-c2, c3) 456 -> (Lsh64x64 x (Const64 <config.fe.TypeUInt64()> [c1-c2+c3])) 457 (Lsh32x64 (Rsh32Ux64 (Lsh32x64 x (Const64 [c1])) (Const64 [c2])) (Const64 [c3])) 458 && uint64(c1) >= uint64(c2) && uint64(c3) >= uint64(c2) && !uaddOvf(c1-c2, c3) 459 -> (Lsh32x64 x (Const64 <config.fe.TypeUInt64()> [c1-c2+c3])) 460 (Lsh16x64 (Rsh16Ux64 (Lsh16x64 x (Const64 [c1])) (Const64 [c2])) (Const64 [c3])) 461 && uint64(c1) >= uint64(c2) && uint64(c3) >= uint64(c2) && !uaddOvf(c1-c2, c3) 462 -> (Lsh16x64 x (Const64 <config.fe.TypeUInt64()> [c1-c2+c3])) 463 (Lsh8x64 (Rsh8Ux64 (Lsh8x64 x (Const64 [c1])) (Const64 [c2])) (Const64 [c3])) 464 && uint64(c1) >= uint64(c2) && uint64(c3) >= uint64(c2) && !uaddOvf(c1-c2, c3) 465 -> (Lsh8x64 x (Const64 <config.fe.TypeUInt64()> [c1-c2+c3])) 466 467 // constant comparisons 468 (Eq64 (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(c == d)]) 469 (Eq32 (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(c == d)]) 470 (Eq16 (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(c == d)]) 471 (Eq8 (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(c == d)]) 472 473 (Neq64 (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(c != d)]) 474 (Neq32 (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(c != d)]) 475 (Neq16 (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(c != d)]) 476 (Neq8 (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(c != d)]) 477 478 (Greater64 (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(c > d)]) 479 (Greater32 (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(c > d)]) 480 (Greater16 (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(c > d)]) 481 (Greater8 (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(c > d)]) 482 483 (Greater64U (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(uint64(c) > uint64(d))]) 484 (Greater32U (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(uint32(c) > uint32(d))]) 485 (Greater16U (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(uint16(c) > uint16(d))]) 486 (Greater8U (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(uint8(c) > uint8(d))]) 487 488 (Geq64 (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(c >= d)]) 489 (Geq32 (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(c >= d)]) 490 (Geq16 (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(c >= d)]) 491 (Geq8 (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(c >= d)]) 492 493 (Geq64U (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(uint64(c) >= uint64(d))]) 494 (Geq32U (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(uint32(c) >= uint32(d))]) 495 (Geq16U (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(uint16(c) >= uint16(d))]) 496 (Geq8U (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(uint8(c) >= uint8(d))]) 497 498 (Less64 (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(c < d)]) 499 (Less32 (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(c < d)]) 500 (Less16 (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(c < d)]) 501 (Less8 (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(c < d)]) 502 503 (Less64U (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(uint64(c) < uint64(d))]) 504 (Less32U (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(uint32(c) < uint32(d))]) 505 (Less16U (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(uint16(c) < uint16(d))]) 506 (Less8U (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(uint8(c) < uint8(d))]) 507 508 (Leq64 (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(c <= d)]) 509 (Leq32 (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(c <= d)]) 510 (Leq16 (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(c <= d)]) 511 (Leq8 (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(c <= d)]) 512 513 (Leq64U (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(uint64(c) <= uint64(d))]) 514 (Leq32U (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(uint32(c) <= uint32(d))]) 515 (Leq16U (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(uint16(c) <= uint16(d))]) 516 (Leq8U (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(uint8(c) <= uint8(d))]) 517 518 // simplifications 519 (Or64 x x) -> x 520 (Or32 x x) -> x 521 (Or16 x x) -> x 522 (Or8 x x) -> x 523 (Or64 (Const64 [0]) x) -> x 524 (Or32 (Const32 [0]) x) -> x 525 (Or16 (Const16 [0]) x) -> x 526 (Or8 (Const8 [0]) x) -> x 527 (Or64 (Const64 [-1]) _) -> (Const64 [-1]) 528 (Or32 (Const32 [-1]) _) -> (Const32 [-1]) 529 (Or16 (Const16 [-1]) _) -> (Const16 [-1]) 530 (Or8 (Const8 [-1]) _) -> (Const8 [-1]) 531 (And64 x x) -> x 532 (And32 x x) -> x 533 (And16 x x) -> x 534 (And8 x x) -> x 535 (And64 (Const64 [-1]) x) -> x 536 (And32 (Const32 [-1]) x) -> x 537 (And16 (Const16 [-1]) x) -> x 538 (And8 (Const8 [-1]) x) -> x 539 (And64 (Const64 [0]) _) -> (Const64 [0]) 540 (And32 (Const32 [0]) _) -> (Const32 [0]) 541 (And16 (Const16 [0]) _) -> (Const16 [0]) 542 (And8 (Const8 [0]) _) -> (Const8 [0]) 543 (Xor64 x x) -> (Const64 [0]) 544 (Xor32 x x) -> (Const32 [0]) 545 (Xor16 x x) -> (Const16 [0]) 546 (Xor8 x x) -> (Const8 [0]) 547 (Xor64 (Const64 [0]) x) -> x 548 (Xor32 (Const32 [0]) x) -> x 549 (Xor16 (Const16 [0]) x) -> x 550 (Xor8 (Const8 [0]) x) -> x 551 (Add64 (Const64 [0]) x) -> x 552 (Add32 (Const32 [0]) x) -> x 553 (Add16 (Const16 [0]) x) -> x 554 (Add8 (Const8 [0]) x) -> x 555 (Sub64 x x) -> (Const64 [0]) 556 (Sub32 x x) -> (Const32 [0]) 557 (Sub16 x x) -> (Const16 [0]) 558 (Sub8 x x) -> (Const8 [0]) 559 (Mul64 (Const64 [0]) _) -> (Const64 [0]) 560 (Mul32 (Const32 [0]) _) -> (Const32 [0]) 561 (Mul16 (Const16 [0]) _) -> (Const16 [0]) 562 (Mul8 (Const8 [0]) _) -> (Const8 [0]) 563 (Com8 (Com8 x)) -> x 564 (Com16 (Com16 x)) -> x 565 (Com32 (Com32 x)) -> x 566 (Com64 (Com64 x)) -> x 567 (Neg8 (Sub8 x y)) -> (Sub8 y x) 568 (Neg16 (Sub16 x y)) -> (Sub16 y x) 569 (Neg32 (Sub32 x y)) -> (Sub32 y x) 570 (Neg64 (Sub64 x y)) -> (Sub64 y x) 571 572 (And64 x (And64 x y)) -> (And64 x y) 573 (And32 x (And32 x y)) -> (And32 x y) 574 (And16 x (And16 x y)) -> (And16 x y) 575 (And8 x (And8 x y)) -> (And8 x y) 576 (And64 x (And64 y x)) -> (And64 x y) 577 (And32 x (And32 y x)) -> (And32 x y) 578 (And16 x (And16 y x)) -> (And16 x y) 579 (And8 x (And8 y x)) -> (And8 x y) 580 (And64 (And64 x y) x) -> (And64 x y) 581 (And32 (And32 x y) x) -> (And32 x y) 582 (And16 (And16 x y) x) -> (And16 x y) 583 (And8 (And8 x y) x) -> (And8 x y) 584 (And64 (And64 x y) y) -> (And64 x y) 585 (And32 (And32 x y) y) -> (And32 x y) 586 (And16 (And16 x y) y) -> (And16 x y) 587 (And8 (And8 x y) y) -> (And8 x y) 588 (Or64 x (Or64 x y)) -> (Or64 x y) 589 (Or32 x (Or32 x y)) -> (Or32 x y) 590 (Or16 x (Or16 x y)) -> (Or16 x y) 591 (Or8 x (Or8 x y)) -> (Or8 x y) 592 (Or64 x (Or64 y x)) -> (Or64 x y) 593 (Or32 x (Or32 y x)) -> (Or32 x y) 594 (Or16 x (Or16 y x)) -> (Or16 x y) 595 (Or8 x (Or8 y x)) -> (Or8 x y) 596 (Or64 (Or64 x y) x) -> (Or64 x y) 597 (Or32 (Or32 x y) x) -> (Or32 x y) 598 (Or16 (Or16 x y) x) -> (Or16 x y) 599 (Or8 (Or8 x y) x) -> (Or8 x y) 600 (Or64 (Or64 x y) y) -> (Or64 x y) 601 (Or32 (Or32 x y) y) -> (Or32 x y) 602 (Or16 (Or16 x y) y) -> (Or16 x y) 603 (Or8 (Or8 x y) y) -> (Or8 x y) 604 (Xor64 x (Xor64 x y)) -> y 605 (Xor32 x (Xor32 x y)) -> y 606 (Xor16 x (Xor16 x y)) -> y 607 (Xor8 x (Xor8 x y)) -> y 608 (Xor64 x (Xor64 y x)) -> y 609 (Xor32 x (Xor32 y x)) -> y 610 (Xor16 x (Xor16 y x)) -> y 611 (Xor8 x (Xor8 y x)) -> y 612 (Xor64 (Xor64 x y) x) -> y 613 (Xor32 (Xor32 x y) x) -> y 614 (Xor16 (Xor16 x y) x) -> y 615 (Xor8 (Xor8 x y) x) -> y 616 (Xor64 (Xor64 x y) y) -> x 617 (Xor32 (Xor32 x y) y) -> x 618 (Xor16 (Xor16 x y) y) -> x 619 (Xor8 (Xor8 x y) y) -> x 620 621 (Trunc64to8 (And64 (Const64 [y]) x)) && y&0xFF == 0xFF -> (Trunc64to8 x) 622 (Trunc64to16 (And64 (Const64 [y]) x)) && y&0xFFFF == 0xFFFF -> (Trunc64to16 x) 623 (Trunc64to32 (And64 (Const64 [y]) x)) && y&0xFFFFFFFF == 0xFFFFFFFF -> (Trunc64to32 x) 624 (Trunc32to8 (And32 (Const32 [y]) x)) && y&0xFF == 0xFF -> (Trunc32to8 x) 625 (Trunc32to16 (And32 (Const32 [y]) x)) && y&0xFFFF == 0xFFFF -> (Trunc32to16 x) 626 (Trunc16to8 (And16 (Const16 [y]) x)) && y&0xFF == 0xFF -> (Trunc16to8 x) 627 628 (ZeroExt8to64 (Trunc64to8 x:(Rsh64Ux64 _ (Const64 [s])))) && s >= 56 -> x 629 (ZeroExt16to64 (Trunc64to16 x:(Rsh64Ux64 _ (Const64 [s])))) && s >= 48 -> x 630 (ZeroExt32to64 (Trunc64to32 x:(Rsh64Ux64 _ (Const64 [s])))) && s >= 32 -> x 631 (ZeroExt8to32 (Trunc32to8 x:(Rsh32Ux64 _ (Const64 [s])))) && s >= 24 -> x 632 (ZeroExt16to32 (Trunc32to16 x:(Rsh32Ux64 _ (Const64 [s])))) && s >= 16 -> x 633 (ZeroExt8to16 (Trunc16to8 x:(Rsh16Ux64 _ (Const64 [s])))) && s >= 8 -> x 634 635 (SignExt8to64 (Trunc64to8 x:(Rsh64x64 _ (Const64 [s])))) && s >= 56 -> x 636 (SignExt16to64 (Trunc64to16 x:(Rsh64x64 _ (Const64 [s])))) && s >= 48 -> x 637 (SignExt32to64 (Trunc64to32 x:(Rsh64x64 _ (Const64 [s])))) && s >= 32 -> x 638 (SignExt8to32 (Trunc32to8 x:(Rsh32x64 _ (Const64 [s])))) && s >= 24 -> x 639 (SignExt16to32 (Trunc32to16 x:(Rsh32x64 _ (Const64 [s])))) && s >= 16 -> x 640 (SignExt8to16 (Trunc16to8 x:(Rsh16x64 _ (Const64 [s])))) && s >= 8 -> x 641 642 (Slicemask (Const32 [x])) && x > 0 -> (Const32 [-1]) 643 (Slicemask (Const32 [0])) -> (Const32 [0]) 644 (Slicemask (Const64 [x])) && x > 0 -> (Const64 [-1]) 645 (Slicemask (Const64 [0])) -> (Const64 [0]) 646 647 // Rewrite AND of consts as shifts if possible, slightly faster for 64 bit operands 648 // leading zeros can be shifted left, then right 649 (And64 <t> (Const64 [y]) x) && nlz(y) + nto(y) == 64 && nto(y) >= 32 650 -> (Rsh64Ux64 (Lsh64x64 <t> x (Const64 <t> [nlz(y)])) (Const64 <t> [nlz(y)])) 651 // trailing zeros can be shifted right, then left 652 (And64 <t> (Const64 [y]) x) && nlo(y) + ntz(y) == 64 && ntz(y) >= 32 653 -> (Lsh64x64 (Rsh64Ux64 <t> x (Const64 <t> [ntz(y)])) (Const64 <t> [ntz(y)])) 654 655 // simplifications often used for lengths. e.g. len(s[i:i+5])==5 656 (Sub64 (Add64 x y) x) -> y 657 (Sub64 (Add64 x y) y) -> x 658 (Sub32 (Add32 x y) x) -> y 659 (Sub32 (Add32 x y) y) -> x 660 (Sub16 (Add16 x y) x) -> y 661 (Sub16 (Add16 x y) y) -> x 662 (Sub8 (Add8 x y) x) -> y 663 (Sub8 (Add8 x y) y) -> x 664 665 // basic phi simplifications 666 (Phi (Const8 [c]) (Const8 [c])) -> (Const8 [c]) 667 (Phi (Const16 [c]) (Const16 [c])) -> (Const16 [c]) 668 (Phi (Const32 [c]) (Const32 [c])) -> (Const32 [c]) 669 (Phi (Const64 [c]) (Const64 [c])) -> (Const64 [c]) 670 671 // user nil checks 672 (NeqPtr p (ConstNil)) -> (IsNonNil p) 673 (NeqPtr (ConstNil) p) -> (IsNonNil p) 674 (EqPtr p (ConstNil)) -> (Not (IsNonNil p)) 675 (EqPtr (ConstNil) p) -> (Not (IsNonNil p)) 676 (IsNonNil (ConstNil)) -> (ConstBool [0]) 677 678 // slice and interface comparisons 679 // The frontend ensures that we can only compare against nil, 680 // so we need only compare the first word (interface type or slice ptr). 681 (EqInter x y) -> (EqPtr (ITab x) (ITab y)) 682 (NeqInter x y) -> (NeqPtr (ITab x) (ITab y)) 683 (EqSlice x y) -> (EqPtr (SlicePtr x) (SlicePtr y)) 684 (NeqSlice x y) -> (NeqPtr (SlicePtr x) (SlicePtr y)) 685 686 // Load of store of same address, with compatibly typed value and same size 687 (Load <t1> p1 (Store [w] p2 x _)) && isSamePtr(p1,p2) && t1.Compare(x.Type)==CMPeq && w == t1.Size() -> x 688 689 // Collapse OffPtr 690 (OffPtr (OffPtr p [b]) [a]) -> (OffPtr p [a+b]) 691 (OffPtr p [0]) && v.Type.Compare(p.Type) == CMPeq -> p 692 693 // indexing operations 694 // Note: bounds check has already been done 695 (PtrIndex <t> ptr idx) && config.PtrSize == 4 -> (AddPtr ptr (Mul32 <config.fe.TypeInt()> idx (Const32 <config.fe.TypeInt()> [t.ElemType().Size()]))) 696 (PtrIndex <t> ptr idx) && config.PtrSize == 8 -> (AddPtr ptr (Mul64 <config.fe.TypeInt()> idx (Const64 <config.fe.TypeInt()> [t.ElemType().Size()]))) 697 698 // struct operations 699 (StructSelect (StructMake1 x)) -> x 700 (StructSelect [0] (StructMake2 x _)) -> x 701 (StructSelect [1] (StructMake2 _ x)) -> x 702 (StructSelect [0] (StructMake3 x _ _)) -> x 703 (StructSelect [1] (StructMake3 _ x _)) -> x 704 (StructSelect [2] (StructMake3 _ _ x)) -> x 705 (StructSelect [0] (StructMake4 x _ _ _)) -> x 706 (StructSelect [1] (StructMake4 _ x _ _)) -> x 707 (StructSelect [2] (StructMake4 _ _ x _)) -> x 708 (StructSelect [3] (StructMake4 _ _ _ x)) -> x 709 710 (Load <t> _ _) && t.IsStruct() && t.NumFields() == 0 && config.fe.CanSSA(t) -> 711 (StructMake0) 712 (Load <t> ptr mem) && t.IsStruct() && t.NumFields() == 1 && config.fe.CanSSA(t) -> 713 (StructMake1 714 (Load <t.FieldType(0)> ptr mem)) 715 (Load <t> ptr mem) && t.IsStruct() && t.NumFields() == 2 && config.fe.CanSSA(t) -> 716 (StructMake2 717 (Load <t.FieldType(0)> ptr mem) 718 (Load <t.FieldType(1)> (OffPtr <t.FieldType(1).PtrTo()> [t.FieldOff(1)] ptr) mem)) 719 (Load <t> ptr mem) && t.IsStruct() && t.NumFields() == 3 && config.fe.CanSSA(t) -> 720 (StructMake3 721 (Load <t.FieldType(0)> ptr mem) 722 (Load <t.FieldType(1)> (OffPtr <t.FieldType(1).PtrTo()> [t.FieldOff(1)] ptr) mem) 723 (Load <t.FieldType(2)> (OffPtr <t.FieldType(2).PtrTo()> [t.FieldOff(2)] ptr) mem)) 724 (Load <t> ptr mem) && t.IsStruct() && t.NumFields() == 4 && config.fe.CanSSA(t) -> 725 (StructMake4 726 (Load <t.FieldType(0)> ptr mem) 727 (Load <t.FieldType(1)> (OffPtr <t.FieldType(1).PtrTo()> [t.FieldOff(1)] ptr) mem) 728 (Load <t.FieldType(2)> (OffPtr <t.FieldType(2).PtrTo()> [t.FieldOff(2)] ptr) mem) 729 (Load <t.FieldType(3)> (OffPtr <t.FieldType(3).PtrTo()> [t.FieldOff(3)] ptr) mem)) 730 731 (StructSelect [i] x:(Load <t> ptr mem)) && !config.fe.CanSSA(t) -> 732 @x.Block (Load <v.Type> (OffPtr <v.Type.PtrTo()> [t.FieldOff(int(i))] ptr) mem) 733 734 (Store _ (StructMake0) mem) -> mem 735 (Store dst (StructMake1 <t> f0) mem) -> 736 (Store [t.FieldType(0).Size()] dst f0 mem) 737 (Store dst (StructMake2 <t> f0 f1) mem) -> 738 (Store [t.FieldType(1).Size()] 739 (OffPtr <t.FieldType(1).PtrTo()> [t.FieldOff(1)] dst) 740 f1 741 (Store [t.FieldType(0).Size()] dst f0 mem)) 742 (Store dst (StructMake3 <t> f0 f1 f2) mem) -> 743 (Store [t.FieldType(2).Size()] 744 (OffPtr <t.FieldType(2).PtrTo()> [t.FieldOff(2)] dst) 745 f2 746 (Store [t.FieldType(1).Size()] 747 (OffPtr <t.FieldType(1).PtrTo()> [t.FieldOff(1)] dst) 748 f1 749 (Store [t.FieldType(0).Size()] dst f0 mem))) 750 (Store dst (StructMake4 <t> f0 f1 f2 f3) mem) -> 751 (Store [t.FieldType(3).Size()] 752 (OffPtr <t.FieldType(3).PtrTo()> [t.FieldOff(3)] dst) 753 f3 754 (Store [t.FieldType(2).Size()] 755 (OffPtr <t.FieldType(2).PtrTo()> [t.FieldOff(2)] dst) 756 f2 757 (Store [t.FieldType(1).Size()] 758 (OffPtr <t.FieldType(1).PtrTo()> [t.FieldOff(1)] dst) 759 f1 760 (Store [t.FieldType(0).Size()] dst f0 mem)))) 761 762 // Putting struct{*byte} and similar into direct interfaces. 763 (IMake typ (StructMake1 val)) -> (IMake typ val) 764 (StructSelect [0] x:(IData _)) -> x 765 766 // un-SSAable values use mem->mem copies 767 (Store [size] dst (Load <t> src mem) mem) && !config.fe.CanSSA(t) -> 768 (Move [MakeSizeAndAlign(size, t.Alignment()).Int64()] dst src mem) 769 (Store [size] dst (Load <t> src mem) (VarDef {x} mem)) && !config.fe.CanSSA(t) -> 770 (Move [MakeSizeAndAlign(size, t.Alignment()).Int64()] dst src (VarDef {x} mem)) 771 772 // array ops 773 (ArraySelect (ArrayMake1 x)) -> x 774 775 (Load <t> _ _) && t.IsArray() && t.NumElem() == 0 -> 776 (ArrayMake0) 777 778 (Load <t> ptr mem) && t.IsArray() && t.NumElem() == 1 && config.fe.CanSSA(t) -> 779 (ArrayMake1 (Load <t.ElemType()> ptr mem)) 780 781 (Store _ (ArrayMake0) mem) -> mem 782 (Store [size] dst (ArrayMake1 e) mem) -> (Store [size] dst e mem) 783 784 (ArraySelect [0] (Load ptr mem)) -> (Load ptr mem) 785 786 // Putting [1]{*byte} and similar into direct interfaces. 787 (IMake typ (ArrayMake1 val)) -> (IMake typ val) 788 (ArraySelect [0] x:(IData _)) -> x 789 790 // string ops 791 // Decomposing StringMake and lowering of StringPtr and StringLen 792 // happens in a later pass, dec, so that these operations are available 793 // to other passes for optimizations. 794 (StringPtr (StringMake (Const64 <t> [c]) _)) -> (Const64 <t> [c]) 795 (StringLen (StringMake _ (Const64 <t> [c]))) -> (Const64 <t> [c]) 796 (ConstString {s}) && config.PtrSize == 4 && s.(string) == "" -> 797 (StringMake (ConstNil) (Const32 <config.fe.TypeInt()> [0])) 798 (ConstString {s}) && config.PtrSize == 8 && s.(string) == "" -> 799 (StringMake (ConstNil) (Const64 <config.fe.TypeInt()> [0])) 800 (ConstString {s}) && config.PtrSize == 4 && s.(string) != "" -> 801 (StringMake 802 (Addr <config.fe.TypeBytePtr()> {config.fe.StringData(s.(string))} 803 (SB)) 804 (Const32 <config.fe.TypeInt()> [int64(len(s.(string)))])) 805 (ConstString {s}) && config.PtrSize == 8 && s.(string) != "" -> 806 (StringMake 807 (Addr <config.fe.TypeBytePtr()> {config.fe.StringData(s.(string))} 808 (SB)) 809 (Const64 <config.fe.TypeInt()> [int64(len(s.(string)))])) 810 811 // slice ops 812 // Only a few slice rules are provided here. See dec.rules for 813 // a more comprehensive set. 814 (SliceLen (SliceMake _ (Const64 <t> [c]) _)) -> (Const64 <t> [c]) 815 (SliceCap (SliceMake _ _ (Const64 <t> [c]))) -> (Const64 <t> [c]) 816 (SliceLen (SliceMake _ (Const32 <t> [c]) _)) -> (Const32 <t> [c]) 817 (SliceCap (SliceMake _ _ (Const32 <t> [c]))) -> (Const32 <t> [c]) 818 (SlicePtr (SliceMake (SlicePtr x) _ _)) -> (SlicePtr x) 819 (SliceLen (SliceMake _ (SliceLen x) _)) -> (SliceLen x) 820 (SliceCap (SliceMake _ _ (SliceCap x))) -> (SliceCap x) 821 (SliceCap (SliceMake _ _ (SliceLen x))) -> (SliceLen x) 822 (ConstSlice) && config.PtrSize == 4 -> 823 (SliceMake 824 (ConstNil <v.Type.ElemType().PtrTo()>) 825 (Const32 <config.fe.TypeInt()> [0]) 826 (Const32 <config.fe.TypeInt()> [0])) 827 (ConstSlice) && config.PtrSize == 8 -> 828 (SliceMake 829 (ConstNil <v.Type.ElemType().PtrTo()>) 830 (Const64 <config.fe.TypeInt()> [0]) 831 (Const64 <config.fe.TypeInt()> [0])) 832 833 // interface ops 834 (ConstInterface) -> 835 (IMake 836 (ConstNil <config.fe.TypeBytePtr()>) 837 (ConstNil <config.fe.TypeBytePtr()>)) 838 839 (NilCheck (GetG mem) mem) -> mem 840 841 (If (Not cond) yes no) -> (If cond no yes) 842 (If (ConstBool [c]) yes no) && c == 1 -> (First nil yes no) 843 (If (ConstBool [c]) yes no) && c == 0 -> (First nil no yes) 844 845 // Get rid of Convert ops for pointer arithmetic on unsafe.Pointer. 846 (Convert (Add64 (Convert ptr mem) off) mem) -> (Add64 ptr off) 847 (Convert (Add64 off (Convert ptr mem)) mem) -> (Add64 ptr off) 848 (Convert (Convert ptr mem) mem) -> ptr 849 850 // Decompose compound argument values 851 (Arg {n} [off]) && v.Type.IsString() -> 852 (StringMake 853 (Arg <config.fe.TypeBytePtr()> {n} [off]) 854 (Arg <config.fe.TypeInt()> {n} [off+config.PtrSize])) 855 856 (Arg {n} [off]) && v.Type.IsSlice() -> 857 (SliceMake 858 (Arg <v.Type.ElemType().PtrTo()> {n} [off]) 859 (Arg <config.fe.TypeInt()> {n} [off+config.PtrSize]) 860 (Arg <config.fe.TypeInt()> {n} [off+2*config.PtrSize])) 861 862 (Arg {n} [off]) && v.Type.IsInterface() -> 863 (IMake 864 (Arg <config.fe.TypeBytePtr()> {n} [off]) 865 (Arg <config.fe.TypeBytePtr()> {n} [off+config.PtrSize])) 866 867 (Arg {n} [off]) && v.Type.IsComplex() && v.Type.Size() == 16 -> 868 (ComplexMake 869 (Arg <config.fe.TypeFloat64()> {n} [off]) 870 (Arg <config.fe.TypeFloat64()> {n} [off+8])) 871 872 (Arg {n} [off]) && v.Type.IsComplex() && v.Type.Size() == 8 -> 873 (ComplexMake 874 (Arg <config.fe.TypeFloat32()> {n} [off]) 875 (Arg <config.fe.TypeFloat32()> {n} [off+4])) 876 877 (Arg <t>) && t.IsStruct() && t.NumFields() == 0 && config.fe.CanSSA(t) -> 878 (StructMake0) 879 (Arg <t> {n} [off]) && t.IsStruct() && t.NumFields() == 1 && config.fe.CanSSA(t) -> 880 (StructMake1 881 (Arg <t.FieldType(0)> {n} [off+t.FieldOff(0)])) 882 (Arg <t> {n} [off]) && t.IsStruct() && t.NumFields() == 2 && config.fe.CanSSA(t) -> 883 (StructMake2 884 (Arg <t.FieldType(0)> {n} [off+t.FieldOff(0)]) 885 (Arg <t.FieldType(1)> {n} [off+t.FieldOff(1)])) 886 (Arg <t> {n} [off]) && t.IsStruct() && t.NumFields() == 3 && config.fe.CanSSA(t) -> 887 (StructMake3 888 (Arg <t.FieldType(0)> {n} [off+t.FieldOff(0)]) 889 (Arg <t.FieldType(1)> {n} [off+t.FieldOff(1)]) 890 (Arg <t.FieldType(2)> {n} [off+t.FieldOff(2)])) 891 (Arg <t> {n} [off]) && t.IsStruct() && t.NumFields() == 4 && config.fe.CanSSA(t) -> 892 (StructMake4 893 (Arg <t.FieldType(0)> {n} [off+t.FieldOff(0)]) 894 (Arg <t.FieldType(1)> {n} [off+t.FieldOff(1)]) 895 (Arg <t.FieldType(2)> {n} [off+t.FieldOff(2)]) 896 (Arg <t.FieldType(3)> {n} [off+t.FieldOff(3)])) 897 898 (Arg <t>) && t.IsArray() && t.NumElem() == 0 -> 899 (ArrayMake0) 900 (Arg <t> {n} [off]) && t.IsArray() && t.NumElem() == 1 && config.fe.CanSSA(t) -> 901 (ArrayMake1 (Arg <t.ElemType()> {n} [off])) 902 903 // strength reduction of divide by a constant. 904 // Note: frontend does <=32 bits. We only need to do 64 bits here. 905 // TODO: Do them all here? 906 907 // Div/mod by 1. Currently handled by frontend. 908 //(Div64 n (Const64 [1])) -> n 909 //(Div64u n (Const64 [1])) -> n 910 //(Mod64 n (Const64 [1])) -> (Const64 [0]) 911 //(Mod64u n (Const64 [1])) -> (Const64 [0]) 912 913 // Unsigned divide by power of 2. 914 (Div64u <t> n (Const64 [c])) && isPowerOfTwo(c) -> (Rsh64Ux64 n (Const64 <t> [log2(c)])) 915 (Mod64u <t> n (Const64 [c])) && isPowerOfTwo(c) -> (And64 n (Const64 <t> [c-1])) 916 917 // Signed divide by power of 2. Currently handled by frontend. 918 // n / c = n >> log(c) if n >= 0 919 // = (n+c-1) >> log(c) if n < 0 920 // We conditionally add c-1 by adding n>>63>>(64-log(c)) (first shift signed, second shift unsigned). 921 //(Div64 <t> n (Const64 [c])) && isPowerOfTwo(c) -> 922 // (Rsh64x64 923 // (Add64 <t> 924 // n 925 // (Rsh64Ux64 <t> 926 // (Rsh64x64 <t> n (Const64 <t> [63])) 927 // (Const64 <t> [64-log2(c)]))) 928 // (Const64 <t> [log2(c)])) 929 930 // Unsigned divide, not a power of 2. Strength reduce to a multiply. 931 (Div64u <t> x (Const64 [c])) && umagic64ok(c) && !umagic64a(c) -> 932 (Rsh64Ux64 933 (Hmul64u <t> 934 (Const64 <t> [umagic64m(c)]) 935 x) 936 (Const64 <t> [umagic64s(c)])) 937 (Div64u <t> x (Const64 [c])) && umagic64ok(c) && umagic64a(c) -> 938 (Rsh64Ux64 939 (Avg64u <t> 940 (Hmul64u <t> 941 x 942 (Const64 <t> [umagic64m(c)])) 943 x) 944 (Const64 <t> [umagic64s(c)-1])) 945 946 // Signed divide, not a power of 2. Strength reduce to a multiply. 947 (Div64 <t> x (Const64 [c])) && c > 0 && smagic64ok(c) && smagic64m(c) > 0 -> 948 (Sub64 <t> 949 (Rsh64x64 <t> 950 (Hmul64 <t> 951 (Const64 <t> [smagic64m(c)]) 952 x) 953 (Const64 <t> [smagic64s(c)])) 954 (Rsh64x64 <t> 955 x 956 (Const64 <t> [63]))) 957 (Div64 <t> x (Const64 [c])) && c > 0 && smagic64ok(c) && smagic64m(c) < 0 -> 958 (Sub64 <t> 959 (Rsh64x64 <t> 960 (Add64 <t> 961 (Hmul64 <t> 962 (Const64 <t> [smagic64m(c)]) 963 x) 964 x) 965 (Const64 <t> [smagic64s(c)])) 966 (Rsh64x64 <t> 967 x 968 (Const64 <t> [63]))) 969 (Div64 <t> x (Const64 [c])) && c < 0 && smagic64ok(c) && smagic64m(c) > 0 -> 970 (Neg64 <t> 971 (Sub64 <t> 972 (Rsh64x64 <t> 973 (Hmul64 <t> 974 (Const64 <t> [smagic64m(c)]) 975 x) 976 (Const64 <t> [smagic64s(c)])) 977 (Rsh64x64 <t> 978 x 979 (Const64 <t> [63])))) 980 (Div64 <t> x (Const64 [c])) && c < 0 && smagic64ok(c) && smagic64m(c) < 0 -> 981 (Neg64 <t> 982 (Sub64 <t> 983 (Rsh64x64 <t> 984 (Add64 <t> 985 (Hmul64 <t> 986 (Const64 <t> [smagic64m(c)]) 987 x) 988 x) 989 (Const64 <t> [smagic64s(c)])) 990 (Rsh64x64 <t> 991 x 992 (Const64 <t> [63])))) 993 994 // A%B = A-(A/B*B). 995 // This implements % with two * and a bunch of ancillary ops. 996 // One of the * is free if the user's code also computes A/B. 997 (Mod64 <t> x (Const64 [c])) && x.Op != OpConst64 && smagic64ok(c) 998 -> (Sub64 x (Mul64 <t> (Div64 <t> x (Const64 <t> [c])) (Const64 <t> [c]))) 999 (Mod64u <t> x (Const64 [c])) && x.Op != OpConst64 && umagic64ok(c) 1000 -> (Sub64 x (Mul64 <t> (Div64u <t> x (Const64 <t> [c])) (Const64 <t> [c]))) 1001 1002 // floating point optimizations 1003 (Add32F x (Const32F [0])) -> x 1004 (Add32F (Const32F [0]) x) -> x 1005 (Add64F x (Const64F [0])) -> x 1006 (Add64F (Const64F [0]) x) -> x 1007 (Sub32F x (Const32F [0])) -> x 1008 (Sub64F x (Const64F [0])) -> x 1009 (Mul32F x (Const32F [f2i(1)])) -> x 1010 (Mul32F (Const32F [f2i(1)]) x) -> x 1011 (Mul64F x (Const64F [f2i(1)])) -> x 1012 (Mul64F (Const64F [f2i(1)]) x) -> x 1013 (Mul32F x (Const32F [f2i(-1)])) -> (Neg32F x) 1014 (Mul32F (Const32F [f2i(-1)]) x) -> (Neg32F x) 1015 (Mul64F x (Const64F [f2i(-1)])) -> (Neg64F x) 1016 (Mul64F (Const64F [f2i(-1)]) x) -> (Neg64F x) 1017 (Div32F x (Const32F [f2i(1)])) -> x 1018 (Div64F x (Const64F [f2i(1)])) -> x 1019 (Div32F x (Const32F [f2i(-1)])) -> (Neg32F x) 1020 (Div64F x (Const64F [f2i(-1)])) -> (Neg32F x) 1021 1022 (Sqrt (Const64F [c])) -> (Const64F [f2i(math.Sqrt(i2f(c)))]) 1023 1024 // recognize runtime.newobject and don't Zero/Nilcheck it 1025 (Zero (Load (OffPtr [c] (SP)) mem) mem) 1026 && mem.Op == OpStaticCall 1027 && isSameSym(mem.Aux, "runtime.newobject") 1028 && c == config.ctxt.FixedFrameSize() + config.PtrSize // offset of return value 1029 -> mem 1030 // nil checks just need to rewrite to something useless. 1031 // they will be deadcode eliminated soon afterwards. 1032 (NilCheck (Load (OffPtr [c] (SP)) mem) mem) 1033 && mem.Op == OpStaticCall 1034 && isSameSym(mem.Aux, "runtime.newobject") 1035 && c == config.ctxt.FixedFrameSize() + config.RegSize // offset of return value 1036 && warnRule(config.Debug_checknil() && v.Pos.Line() > 1, v, "removed nil check") 1037 -> (Invalid) 1038 (NilCheck (OffPtr (Load (OffPtr [c] (SP)) mem)) mem) 1039 && mem.Op == OpStaticCall 1040 && isSameSym(mem.Aux, "runtime.newobject") 1041 && c == config.ctxt.FixedFrameSize() + config.RegSize // offset of return value 1042 && warnRule(config.Debug_checknil() && v.Pos.Line() > 1, v, "removed nil check") 1043 -> (Invalid)