github.com/riscv/riscv-go@v0.0.0-20200123204226-124ebd6fcc8e/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 (Mod8 (Const8 [c]) (Const8 [d])) && d != 0 -> (Const8 [int64(int8(c % d))]) 124 (Mod16 (Const16 [c]) (Const16 [d])) && d != 0 -> (Const16 [int64(int16(c % d))]) 125 (Mod32 (Const32 [c]) (Const32 [d])) && d != 0 -> (Const32 [int64(int32(c % d))]) 126 (Mod64 (Const64 [c]) (Const64 [d])) && d != 0 -> (Const64 [c % d]) 127 128 (Mod8u (Const8 [c]) (Const8 [d])) && d != 0 -> (Const8 [int64(uint8(c) % uint8(d))]) 129 (Mod16u (Const16 [c]) (Const16 [d])) && d != 0 -> (Const16 [int64(uint16(c) % uint16(d))]) 130 (Mod32u (Const32 [c]) (Const32 [d])) && d != 0 -> (Const32 [int64(uint32(c) % uint32(d))]) 131 (Mod64u (Const64 [c]) (Const64 [d])) && d != 0 -> (Const64 [int64(uint64(c) % uint64(d))]) 132 133 (Lsh64x64 (Const64 [c]) (Const64 [d])) -> (Const64 [c << uint64(d)]) 134 (Rsh64x64 (Const64 [c]) (Const64 [d])) -> (Const64 [c >> uint64(d)]) 135 (Rsh64Ux64 (Const64 [c]) (Const64 [d])) -> (Const64 [int64(uint64(c) >> uint64(d))]) 136 (Lsh32x64 (Const32 [c]) (Const64 [d])) -> (Const32 [int64(int32(c) << uint64(d))]) 137 (Rsh32x64 (Const32 [c]) (Const64 [d])) -> (Const32 [int64(int32(c) >> uint64(d))]) 138 (Rsh32Ux64 (Const32 [c]) (Const64 [d])) -> (Const32 [int64(int32(uint32(c) >> uint64(d)))]) 139 (Lsh16x64 (Const16 [c]) (Const64 [d])) -> (Const16 [int64(int16(c) << uint64(d))]) 140 (Rsh16x64 (Const16 [c]) (Const64 [d])) -> (Const16 [int64(int16(c) >> uint64(d))]) 141 (Rsh16Ux64 (Const16 [c]) (Const64 [d])) -> (Const16 [int64(int16(uint16(c) >> uint64(d)))]) 142 (Lsh8x64 (Const8 [c]) (Const64 [d])) -> (Const8 [int64(int8(c) << uint64(d))]) 143 (Rsh8x64 (Const8 [c]) (Const64 [d])) -> (Const8 [int64(int8(c) >> uint64(d))]) 144 (Rsh8Ux64 (Const8 [c]) (Const64 [d])) -> (Const8 [int64(int8(uint8(c) >> uint64(d)))]) 145 146 // Fold IsInBounds when the range of the index cannot exceed the limit. 147 (IsInBounds (ZeroExt8to32 _) (Const32 [c])) && (1 << 8) <= c -> (ConstBool [1]) 148 (IsInBounds (ZeroExt8to64 _) (Const64 [c])) && (1 << 8) <= c -> (ConstBool [1]) 149 (IsInBounds (ZeroExt16to32 _) (Const32 [c])) && (1 << 16) <= c -> (ConstBool [1]) 150 (IsInBounds (ZeroExt16to64 _) (Const64 [c])) && (1 << 16) <= c -> (ConstBool [1]) 151 (IsInBounds x x) -> (ConstBool [0]) 152 (IsInBounds (And32 (Const32 [c]) _) (Const32 [d])) && 0 <= c && c < d -> (ConstBool [1]) 153 (IsInBounds (And64 (Const64 [c]) _) (Const64 [d])) && 0 <= c && c < d -> (ConstBool [1]) 154 (IsInBounds (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(0 <= c && c < d)]) 155 (IsInBounds (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(0 <= c && c < d)]) 156 // (Mod64u x y) is always between 0 (inclusive) and y (exclusive). 157 (IsInBounds (Mod32u _ y) y) -> (ConstBool [1]) 158 (IsInBounds (Mod64u _ y) y) -> (ConstBool [1]) 159 160 (IsSliceInBounds x x) -> (ConstBool [1]) 161 (IsSliceInBounds (And32 (Const32 [c]) _) (Const32 [d])) && 0 <= c && c <= d -> (ConstBool [1]) 162 (IsSliceInBounds (And64 (Const64 [c]) _) (Const64 [d])) && 0 <= c && c <= d -> (ConstBool [1]) 163 (IsSliceInBounds (Const32 [0]) _) -> (ConstBool [1]) 164 (IsSliceInBounds (Const64 [0]) _) -> (ConstBool [1]) 165 (IsSliceInBounds (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(0 <= c && c <= d)]) 166 (IsSliceInBounds (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(0 <= c && c <= d)]) 167 (IsSliceInBounds (SliceLen x) (SliceCap x)) -> (ConstBool [1]) 168 169 (Eq64 x x) -> (ConstBool [1]) 170 (Eq32 x x) -> (ConstBool [1]) 171 (Eq16 x x) -> (ConstBool [1]) 172 (Eq8 x x) -> (ConstBool [1]) 173 (EqB (ConstBool [c]) (ConstBool [d])) -> (ConstBool [b2i(c == d)]) 174 (EqB (ConstBool [0]) x) -> (Not x) 175 (EqB (ConstBool [1]) x) -> x 176 177 (Neq64 x x) -> (ConstBool [0]) 178 (Neq32 x x) -> (ConstBool [0]) 179 (Neq16 x x) -> (ConstBool [0]) 180 (Neq8 x x) -> (ConstBool [0]) 181 (NeqB (ConstBool [c]) (ConstBool [d])) -> (ConstBool [b2i(c != d)]) 182 (NeqB (ConstBool [0]) x) -> x 183 (NeqB (ConstBool [1]) x) -> (Not x) 184 185 (Eq64 (Const64 <t> [c]) (Add64 (Const64 <t> [d]) x)) -> (Eq64 (Const64 <t> [c-d]) x) 186 (Eq32 (Const32 <t> [c]) (Add32 (Const32 <t> [d]) x)) -> (Eq32 (Const32 <t> [int64(int32(c-d))]) x) 187 (Eq16 (Const16 <t> [c]) (Add16 (Const16 <t> [d]) x)) -> (Eq16 (Const16 <t> [int64(int16(c-d))]) x) 188 (Eq8 (Const8 <t> [c]) (Add8 (Const8 <t> [d]) x)) -> (Eq8 (Const8 <t> [int64(int8(c-d))]) x) 189 190 (Neq64 (Const64 <t> [c]) (Add64 (Const64 <t> [d]) x)) -> (Neq64 (Const64 <t> [c-d]) x) 191 (Neq32 (Const32 <t> [c]) (Add32 (Const32 <t> [d]) x)) -> (Neq32 (Const32 <t> [int64(int32(c-d))]) x) 192 (Neq16 (Const16 <t> [c]) (Add16 (Const16 <t> [d]) x)) -> (Neq16 (Const16 <t> [int64(int16(c-d))]) x) 193 (Neq8 (Const8 <t> [c]) (Add8 (Const8 <t> [d]) x)) -> (Neq8 (Const8 <t> [int64(int8(c-d))]) x) 194 195 // canonicalize: swap arguments for commutative operations when one argument is a constant. 196 (Eq64 x (Const64 <t> [c])) && x.Op != OpConst64 -> (Eq64 (Const64 <t> [c]) x) 197 (Eq32 x (Const32 <t> [c])) && x.Op != OpConst32 -> (Eq32 (Const32 <t> [c]) x) 198 (Eq16 x (Const16 <t> [c])) && x.Op != OpConst16 -> (Eq16 (Const16 <t> [c]) x) 199 (Eq8 x (Const8 <t> [c])) && x.Op != OpConst8 -> (Eq8 (Const8 <t> [c]) x) 200 201 (Neq64 x (Const64 <t> [c])) && x.Op != OpConst64 -> (Neq64 (Const64 <t> [c]) x) 202 (Neq32 x (Const32 <t> [c])) && x.Op != OpConst32 -> (Neq32 (Const32 <t> [c]) x) 203 (Neq16 x (Const16 <t> [c])) && x.Op != OpConst16 -> (Neq16 (Const16 <t> [c]) x) 204 (Neq8 x (Const8 <t> [c])) && x.Op != OpConst8 -> (Neq8 (Const8 <t> [c]) x) 205 206 // AddPtr is not canonicalized because nilcheck ptr checks the first argument to be non-nil. 207 (Add64 x (Const64 <t> [c])) && x.Op != OpConst64 -> (Add64 (Const64 <t> [c]) x) 208 (Add32 x (Const32 <t> [c])) && x.Op != OpConst32 -> (Add32 (Const32 <t> [c]) x) 209 (Add16 x (Const16 <t> [c])) && x.Op != OpConst16 -> (Add16 (Const16 <t> [c]) x) 210 (Add8 x (Const8 <t> [c])) && x.Op != OpConst8 -> (Add8 (Const8 <t> [c]) x) 211 212 (Mul64 x (Const64 <t> [c])) && x.Op != OpConst64 -> (Mul64 (Const64 <t> [c]) x) 213 (Mul32 x (Const32 <t> [c])) && x.Op != OpConst32 -> (Mul32 (Const32 <t> [c]) x) 214 (Mul16 x (Const16 <t> [c])) && x.Op != OpConst16 -> (Mul16 (Const16 <t> [c]) x) 215 (Mul8 x (Const8 <t> [c])) && x.Op != OpConst8 -> (Mul8 (Const8 <t> [c]) x) 216 217 (Sub64 x (Const64 <t> [c])) && x.Op != OpConst64 -> (Add64 (Const64 <t> [-c]) x) 218 (Sub32 x (Const32 <t> [c])) && x.Op != OpConst32 -> (Add32 (Const32 <t> [int64(int32(-c))]) x) 219 (Sub16 x (Const16 <t> [c])) && x.Op != OpConst16 -> (Add16 (Const16 <t> [int64(int16(-c))]) x) 220 (Sub8 x (Const8 <t> [c])) && x.Op != OpConst8 -> (Add8 (Const8 <t> [int64(int8(-c))]) x) 221 222 (And64 x (Const64 <t> [c])) && x.Op != OpConst64 -> (And64 (Const64 <t> [c]) x) 223 (And32 x (Const32 <t> [c])) && x.Op != OpConst32 -> (And32 (Const32 <t> [c]) x) 224 (And16 x (Const16 <t> [c])) && x.Op != OpConst16 -> (And16 (Const16 <t> [c]) x) 225 (And8 x (Const8 <t> [c])) && x.Op != OpConst8 -> (And8 (Const8 <t> [c]) x) 226 227 (Or64 x (Const64 <t> [c])) && x.Op != OpConst64 -> (Or64 (Const64 <t> [c]) x) 228 (Or32 x (Const32 <t> [c])) && x.Op != OpConst32 -> (Or32 (Const32 <t> [c]) x) 229 (Or16 x (Const16 <t> [c])) && x.Op != OpConst16 -> (Or16 (Const16 <t> [c]) x) 230 (Or8 x (Const8 <t> [c])) && x.Op != OpConst8 -> (Or8 (Const8 <t> [c]) x) 231 232 (Xor64 x (Const64 <t> [c])) && x.Op != OpConst64 -> (Xor64 (Const64 <t> [c]) x) 233 (Xor32 x (Const32 <t> [c])) && x.Op != OpConst32 -> (Xor32 (Const32 <t> [c]) x) 234 (Xor16 x (Const16 <t> [c])) && x.Op != OpConst16 -> (Xor16 (Const16 <t> [c]) x) 235 (Xor8 x (Const8 <t> [c])) && x.Op != OpConst8 -> (Xor8 (Const8 <t> [c]) x) 236 237 // fold negation into comparison operators 238 (Not (Eq64 x y)) -> (Neq64 x y) 239 (Not (Eq32 x y)) -> (Neq32 x y) 240 (Not (Eq16 x y)) -> (Neq16 x y) 241 (Not (Eq8 x y)) -> (Neq8 x y) 242 (Not (EqB x y)) -> (NeqB x y) 243 244 (Not (Neq64 x y)) -> (Eq64 x y) 245 (Not (Neq32 x y)) -> (Eq32 x y) 246 (Not (Neq16 x y)) -> (Eq16 x y) 247 (Not (Neq8 x y)) -> (Eq8 x y) 248 (Not (NeqB x y)) -> (EqB x y) 249 250 (Not (Greater64 x y)) -> (Leq64 x y) 251 (Not (Greater32 x y)) -> (Leq32 x y) 252 (Not (Greater16 x y)) -> (Leq16 x y) 253 (Not (Greater8 x y)) -> (Leq8 x y) 254 255 (Not (Greater64U x y)) -> (Leq64U x y) 256 (Not (Greater32U x y)) -> (Leq32U x y) 257 (Not (Greater16U x y)) -> (Leq16U x y) 258 (Not (Greater8U x y)) -> (Leq8U x y) 259 260 (Not (Geq64 x y)) -> (Less64 x y) 261 (Not (Geq32 x y)) -> (Less32 x y) 262 (Not (Geq16 x y)) -> (Less16 x y) 263 (Not (Geq8 x y)) -> (Less8 x y) 264 265 (Not (Geq64U x y)) -> (Less64U x y) 266 (Not (Geq32U x y)) -> (Less32U x y) 267 (Not (Geq16U x y)) -> (Less16U x y) 268 (Not (Geq8U x y)) -> (Less8U x y) 269 270 (Not (Less64 x y)) -> (Geq64 x y) 271 (Not (Less32 x y)) -> (Geq32 x y) 272 (Not (Less16 x y)) -> (Geq16 x y) 273 (Not (Less8 x y)) -> (Geq8 x y) 274 275 (Not (Less64U x y)) -> (Geq64U x y) 276 (Not (Less32U x y)) -> (Geq32U x y) 277 (Not (Less16U x y)) -> (Geq16U x y) 278 (Not (Less8U x y)) -> (Geq8U x y) 279 280 (Not (Leq64 x y)) -> (Greater64 x y) 281 (Not (Leq32 x y)) -> (Greater32 x y) 282 (Not (Leq16 x y)) -> (Greater16 x y) 283 (Not (Leq8 x y)) -> (Greater8 x y) 284 285 (Not (Leq64U x y)) -> (Greater64U x y) 286 (Not (Leq32U x y)) -> (Greater32U x y) 287 (Not (Leq16U x y)) -> (Greater16U x y) 288 (Not (Leq8U x y)) -> (Greater8U x y) 289 290 // Distribute multiplication c * (d+x) -> c*d + c*x. Useful for: 291 // a[i].b = ...; a[i+1].b = ... 292 (Mul64 (Const64 <t> [c]) (Add64 <t> (Const64 <t> [d]) x)) -> 293 (Add64 (Const64 <t> [c*d]) (Mul64 <t> (Const64 <t> [c]) x)) 294 (Mul32 (Const32 <t> [c]) (Add32 <t> (Const32 <t> [d]) x)) -> 295 (Add32 (Const32 <t> [int64(int32(c*d))]) (Mul32 <t> (Const32 <t> [c]) x)) 296 297 // rewrite shifts of 8/16/32 bit consts into 64 bit consts to reduce 298 // the number of the other rewrite rules for const shifts 299 (Lsh64x32 <t> x (Const32 [c])) -> (Lsh64x64 x (Const64 <t> [int64(uint32(c))])) 300 (Lsh64x16 <t> x (Const16 [c])) -> (Lsh64x64 x (Const64 <t> [int64(uint16(c))])) 301 (Lsh64x8 <t> x (Const8 [c])) -> (Lsh64x64 x (Const64 <t> [int64(uint8(c))])) 302 (Rsh64x32 <t> x (Const32 [c])) -> (Rsh64x64 x (Const64 <t> [int64(uint32(c))])) 303 (Rsh64x16 <t> x (Const16 [c])) -> (Rsh64x64 x (Const64 <t> [int64(uint16(c))])) 304 (Rsh64x8 <t> x (Const8 [c])) -> (Rsh64x64 x (Const64 <t> [int64(uint8(c))])) 305 (Rsh64Ux32 <t> x (Const32 [c])) -> (Rsh64Ux64 x (Const64 <t> [int64(uint32(c))])) 306 (Rsh64Ux16 <t> x (Const16 [c])) -> (Rsh64Ux64 x (Const64 <t> [int64(uint16(c))])) 307 (Rsh64Ux8 <t> x (Const8 [c])) -> (Rsh64Ux64 x (Const64 <t> [int64(uint8(c))])) 308 309 (Lsh32x32 <t> x (Const32 [c])) -> (Lsh32x64 x (Const64 <t> [int64(uint32(c))])) 310 (Lsh32x16 <t> x (Const16 [c])) -> (Lsh32x64 x (Const64 <t> [int64(uint16(c))])) 311 (Lsh32x8 <t> x (Const8 [c])) -> (Lsh32x64 x (Const64 <t> [int64(uint8(c))])) 312 (Rsh32x32 <t> x (Const32 [c])) -> (Rsh32x64 x (Const64 <t> [int64(uint32(c))])) 313 (Rsh32x16 <t> x (Const16 [c])) -> (Rsh32x64 x (Const64 <t> [int64(uint16(c))])) 314 (Rsh32x8 <t> x (Const8 [c])) -> (Rsh32x64 x (Const64 <t> [int64(uint8(c))])) 315 (Rsh32Ux32 <t> x (Const32 [c])) -> (Rsh32Ux64 x (Const64 <t> [int64(uint32(c))])) 316 (Rsh32Ux16 <t> x (Const16 [c])) -> (Rsh32Ux64 x (Const64 <t> [int64(uint16(c))])) 317 (Rsh32Ux8 <t> x (Const8 [c])) -> (Rsh32Ux64 x (Const64 <t> [int64(uint8(c))])) 318 319 (Lsh16x32 <t> x (Const32 [c])) -> (Lsh16x64 x (Const64 <t> [int64(uint32(c))])) 320 (Lsh16x16 <t> x (Const16 [c])) -> (Lsh16x64 x (Const64 <t> [int64(uint16(c))])) 321 (Lsh16x8 <t> x (Const8 [c])) -> (Lsh16x64 x (Const64 <t> [int64(uint8(c))])) 322 (Rsh16x32 <t> x (Const32 [c])) -> (Rsh16x64 x (Const64 <t> [int64(uint32(c))])) 323 (Rsh16x16 <t> x (Const16 [c])) -> (Rsh16x64 x (Const64 <t> [int64(uint16(c))])) 324 (Rsh16x8 <t> x (Const8 [c])) -> (Rsh16x64 x (Const64 <t> [int64(uint8(c))])) 325 (Rsh16Ux32 <t> x (Const32 [c])) -> (Rsh16Ux64 x (Const64 <t> [int64(uint32(c))])) 326 (Rsh16Ux16 <t> x (Const16 [c])) -> (Rsh16Ux64 x (Const64 <t> [int64(uint16(c))])) 327 (Rsh16Ux8 <t> x (Const8 [c])) -> (Rsh16Ux64 x (Const64 <t> [int64(uint8(c))])) 328 329 (Lsh8x32 <t> x (Const32 [c])) -> (Lsh8x64 x (Const64 <t> [int64(uint32(c))])) 330 (Lsh8x16 <t> x (Const16 [c])) -> (Lsh8x64 x (Const64 <t> [int64(uint16(c))])) 331 (Lsh8x8 <t> x (Const8 [c])) -> (Lsh8x64 x (Const64 <t> [int64(uint8(c))])) 332 (Rsh8x32 <t> x (Const32 [c])) -> (Rsh8x64 x (Const64 <t> [int64(uint32(c))])) 333 (Rsh8x16 <t> x (Const16 [c])) -> (Rsh8x64 x (Const64 <t> [int64(uint16(c))])) 334 (Rsh8x8 <t> x (Const8 [c])) -> (Rsh8x64 x (Const64 <t> [int64(uint8(c))])) 335 (Rsh8Ux32 <t> x (Const32 [c])) -> (Rsh8Ux64 x (Const64 <t> [int64(uint32(c))])) 336 (Rsh8Ux16 <t> x (Const16 [c])) -> (Rsh8Ux64 x (Const64 <t> [int64(uint16(c))])) 337 (Rsh8Ux8 <t> x (Const8 [c])) -> (Rsh8Ux64 x (Const64 <t> [int64(uint8(c))])) 338 339 // shifts by zero 340 (Lsh64x64 x (Const64 [0])) -> x 341 (Rsh64x64 x (Const64 [0])) -> x 342 (Rsh64Ux64 x (Const64 [0])) -> x 343 (Lsh32x64 x (Const64 [0])) -> x 344 (Rsh32x64 x (Const64 [0])) -> x 345 (Rsh32Ux64 x (Const64 [0])) -> x 346 (Lsh16x64 x (Const64 [0])) -> x 347 (Rsh16x64 x (Const64 [0])) -> x 348 (Rsh16Ux64 x (Const64 [0])) -> x 349 (Lsh8x64 x (Const64 [0])) -> x 350 (Rsh8x64 x (Const64 [0])) -> x 351 (Rsh8Ux64 x (Const64 [0])) -> x 352 353 // zero shifted. 354 (Lsh64x64 (Const64 [0]) _) -> (Const64 [0]) 355 (Lsh64x32 (Const64 [0]) _) -> (Const64 [0]) 356 (Lsh64x16 (Const64 [0]) _) -> (Const64 [0]) 357 (Lsh64x8 (Const64 [0]) _) -> (Const64 [0]) 358 (Rsh64x64 (Const64 [0]) _) -> (Const64 [0]) 359 (Rsh64x32 (Const64 [0]) _) -> (Const64 [0]) 360 (Rsh64x16 (Const64 [0]) _) -> (Const64 [0]) 361 (Rsh64x8 (Const64 [0]) _) -> (Const64 [0]) 362 (Rsh64Ux64 (Const64 [0]) _) -> (Const64 [0]) 363 (Rsh64Ux32 (Const64 [0]) _) -> (Const64 [0]) 364 (Rsh64Ux16 (Const64 [0]) _) -> (Const64 [0]) 365 (Rsh64Ux8 (Const64 [0]) _) -> (Const64 [0]) 366 (Lsh32x64 (Const32 [0]) _) -> (Const32 [0]) 367 (Lsh32x32 (Const32 [0]) _) -> (Const32 [0]) 368 (Lsh32x16 (Const32 [0]) _) -> (Const32 [0]) 369 (Lsh32x8 (Const32 [0]) _) -> (Const32 [0]) 370 (Rsh32x64 (Const32 [0]) _) -> (Const32 [0]) 371 (Rsh32x32 (Const32 [0]) _) -> (Const32 [0]) 372 (Rsh32x16 (Const32 [0]) _) -> (Const32 [0]) 373 (Rsh32x8 (Const32 [0]) _) -> (Const32 [0]) 374 (Rsh32Ux64 (Const32 [0]) _) -> (Const32 [0]) 375 (Rsh32Ux32 (Const32 [0]) _) -> (Const32 [0]) 376 (Rsh32Ux16 (Const32 [0]) _) -> (Const32 [0]) 377 (Rsh32Ux8 (Const32 [0]) _) -> (Const32 [0]) 378 (Lsh16x64 (Const16 [0]) _) -> (Const16 [0]) 379 (Lsh16x32 (Const16 [0]) _) -> (Const16 [0]) 380 (Lsh16x16 (Const16 [0]) _) -> (Const16 [0]) 381 (Lsh16x8 (Const16 [0]) _) -> (Const16 [0]) 382 (Rsh16x64 (Const16 [0]) _) -> (Const16 [0]) 383 (Rsh16x32 (Const16 [0]) _) -> (Const16 [0]) 384 (Rsh16x16 (Const16 [0]) _) -> (Const16 [0]) 385 (Rsh16x8 (Const16 [0]) _) -> (Const16 [0]) 386 (Rsh16Ux64 (Const16 [0]) _) -> (Const16 [0]) 387 (Rsh16Ux32 (Const16 [0]) _) -> (Const16 [0]) 388 (Rsh16Ux16 (Const16 [0]) _) -> (Const16 [0]) 389 (Rsh16Ux8 (Const16 [0]) _) -> (Const16 [0]) 390 (Lsh8x64 (Const8 [0]) _) -> (Const8 [0]) 391 (Lsh8x32 (Const8 [0]) _) -> (Const8 [0]) 392 (Lsh8x16 (Const8 [0]) _) -> (Const8 [0]) 393 (Lsh8x8 (Const8 [0]) _) -> (Const8 [0]) 394 (Rsh8x64 (Const8 [0]) _) -> (Const8 [0]) 395 (Rsh8x32 (Const8 [0]) _) -> (Const8 [0]) 396 (Rsh8x16 (Const8 [0]) _) -> (Const8 [0]) 397 (Rsh8x8 (Const8 [0]) _) -> (Const8 [0]) 398 (Rsh8Ux64 (Const8 [0]) _) -> (Const8 [0]) 399 (Rsh8Ux32 (Const8 [0]) _) -> (Const8 [0]) 400 (Rsh8Ux16 (Const8 [0]) _) -> (Const8 [0]) 401 (Rsh8Ux8 (Const8 [0]) _) -> (Const8 [0]) 402 403 // large left shifts of all values, and right shifts of unsigned values 404 (Lsh64x64 _ (Const64 [c])) && uint64(c) >= 64 -> (Const64 [0]) 405 (Rsh64Ux64 _ (Const64 [c])) && uint64(c) >= 64 -> (Const64 [0]) 406 (Lsh32x64 _ (Const64 [c])) && uint64(c) >= 32 -> (Const32 [0]) 407 (Rsh32Ux64 _ (Const64 [c])) && uint64(c) >= 32 -> (Const32 [0]) 408 (Lsh16x64 _ (Const64 [c])) && uint64(c) >= 16 -> (Const16 [0]) 409 (Rsh16Ux64 _ (Const64 [c])) && uint64(c) >= 16 -> (Const16 [0]) 410 (Lsh8x64 _ (Const64 [c])) && uint64(c) >= 8 -> (Const8 [0]) 411 (Rsh8Ux64 _ (Const64 [c])) && uint64(c) >= 8 -> (Const8 [0]) 412 413 // combine const shifts 414 (Lsh64x64 <t> (Lsh64x64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Lsh64x64 x (Const64 <t> [c+d])) 415 (Lsh32x64 <t> (Lsh32x64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Lsh32x64 x (Const64 <t> [c+d])) 416 (Lsh16x64 <t> (Lsh16x64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Lsh16x64 x (Const64 <t> [c+d])) 417 (Lsh8x64 <t> (Lsh8x64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Lsh8x64 x (Const64 <t> [c+d])) 418 419 (Rsh64x64 <t> (Rsh64x64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Rsh64x64 x (Const64 <t> [c+d])) 420 (Rsh32x64 <t> (Rsh32x64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Rsh32x64 x (Const64 <t> [c+d])) 421 (Rsh16x64 <t> (Rsh16x64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Rsh16x64 x (Const64 <t> [c+d])) 422 (Rsh8x64 <t> (Rsh8x64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Rsh8x64 x (Const64 <t> [c+d])) 423 424 (Rsh64Ux64 <t> (Rsh64Ux64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Rsh64Ux64 x (Const64 <t> [c+d])) 425 (Rsh32Ux64 <t> (Rsh32Ux64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Rsh32Ux64 x (Const64 <t> [c+d])) 426 (Rsh16Ux64 <t> (Rsh16Ux64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Rsh16Ux64 x (Const64 <t> [c+d])) 427 (Rsh8Ux64 <t> (Rsh8Ux64 x (Const64 [c])) (Const64 [d])) && !uaddOvf(c,d) -> (Rsh8Ux64 x (Const64 <t> [c+d])) 428 429 // ((x >> c1) << c2) >> c3 430 (Rsh64Ux64 (Lsh64x64 (Rsh64Ux64 x (Const64 [c1])) (Const64 [c2])) (Const64 [c3])) 431 && uint64(c1) >= uint64(c2) && uint64(c3) >= uint64(c2) && !uaddOvf(c1-c2, c3) 432 -> (Rsh64Ux64 x (Const64 <config.fe.TypeUInt64()> [c1-c2+c3])) 433 (Rsh32Ux64 (Lsh32x64 (Rsh32Ux64 x (Const64 [c1])) (Const64 [c2])) (Const64 [c3])) 434 && uint64(c1) >= uint64(c2) && uint64(c3) >= uint64(c2) && !uaddOvf(c1-c2, c3) 435 -> (Rsh32Ux64 x (Const64 <config.fe.TypeUInt64()> [c1-c2+c3])) 436 (Rsh16Ux64 (Lsh16x64 (Rsh16Ux64 x (Const64 [c1])) (Const64 [c2])) (Const64 [c3])) 437 && uint64(c1) >= uint64(c2) && uint64(c3) >= uint64(c2) && !uaddOvf(c1-c2, c3) 438 -> (Rsh16Ux64 x (Const64 <config.fe.TypeUInt64()> [c1-c2+c3])) 439 (Rsh8Ux64 (Lsh8x64 (Rsh8Ux64 x (Const64 [c1])) (Const64 [c2])) (Const64 [c3])) 440 && uint64(c1) >= uint64(c2) && uint64(c3) >= uint64(c2) && !uaddOvf(c1-c2, c3) 441 -> (Rsh8Ux64 x (Const64 <config.fe.TypeUInt64()> [c1-c2+c3])) 442 443 // ((x << c1) >> c2) << c3 444 (Lsh64x64 (Rsh64Ux64 (Lsh64x64 x (Const64 [c1])) (Const64 [c2])) (Const64 [c3])) 445 && uint64(c1) >= uint64(c2) && uint64(c3) >= uint64(c2) && !uaddOvf(c1-c2, c3) 446 -> (Lsh64x64 x (Const64 <config.fe.TypeUInt64()> [c1-c2+c3])) 447 (Lsh32x64 (Rsh32Ux64 (Lsh32x64 x (Const64 [c1])) (Const64 [c2])) (Const64 [c3])) 448 && uint64(c1) >= uint64(c2) && uint64(c3) >= uint64(c2) && !uaddOvf(c1-c2, c3) 449 -> (Lsh32x64 x (Const64 <config.fe.TypeUInt64()> [c1-c2+c3])) 450 (Lsh16x64 (Rsh16Ux64 (Lsh16x64 x (Const64 [c1])) (Const64 [c2])) (Const64 [c3])) 451 && uint64(c1) >= uint64(c2) && uint64(c3) >= uint64(c2) && !uaddOvf(c1-c2, c3) 452 -> (Lsh16x64 x (Const64 <config.fe.TypeUInt64()> [c1-c2+c3])) 453 (Lsh8x64 (Rsh8Ux64 (Lsh8x64 x (Const64 [c1])) (Const64 [c2])) (Const64 [c3])) 454 && uint64(c1) >= uint64(c2) && uint64(c3) >= uint64(c2) && !uaddOvf(c1-c2, c3) 455 -> (Lsh8x64 x (Const64 <config.fe.TypeUInt64()> [c1-c2+c3])) 456 457 // constant comparisons 458 (Eq64 (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(c == d)]) 459 (Eq32 (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(c == d)]) 460 (Eq16 (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(c == d)]) 461 (Eq8 (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(c == d)]) 462 463 (Neq64 (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(c != d)]) 464 (Neq32 (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(c != d)]) 465 (Neq16 (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(c != d)]) 466 (Neq8 (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(c != d)]) 467 468 (Greater64 (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(c > d)]) 469 (Greater32 (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(c > d)]) 470 (Greater16 (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(c > d)]) 471 (Greater8 (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(c > d)]) 472 473 (Greater64U (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(uint64(c) > uint64(d))]) 474 (Greater32U (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(uint32(c) > uint32(d))]) 475 (Greater16U (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(uint16(c) > uint16(d))]) 476 (Greater8U (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(uint8(c) > uint8(d))]) 477 478 (Geq64 (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(c >= d)]) 479 (Geq32 (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(c >= d)]) 480 (Geq16 (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(c >= d)]) 481 (Geq8 (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(c >= d)]) 482 483 (Geq64U (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(uint64(c) >= uint64(d))]) 484 (Geq32U (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(uint32(c) >= uint32(d))]) 485 (Geq16U (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(uint16(c) >= uint16(d))]) 486 (Geq8U (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(uint8(c) >= uint8(d))]) 487 488 (Less64 (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(c < d)]) 489 (Less32 (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(c < d)]) 490 (Less16 (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(c < d)]) 491 (Less8 (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(c < d)]) 492 493 (Less64U (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(uint64(c) < uint64(d))]) 494 (Less32U (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(uint32(c) < uint32(d))]) 495 (Less16U (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(uint16(c) < uint16(d))]) 496 (Less8U (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(uint8(c) < uint8(d))]) 497 498 (Leq64 (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(c <= d)]) 499 (Leq32 (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(c <= d)]) 500 (Leq16 (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(c <= d)]) 501 (Leq8 (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(c <= d)]) 502 503 (Leq64U (Const64 [c]) (Const64 [d])) -> (ConstBool [b2i(uint64(c) <= uint64(d))]) 504 (Leq32U (Const32 [c]) (Const32 [d])) -> (ConstBool [b2i(uint32(c) <= uint32(d))]) 505 (Leq16U (Const16 [c]) (Const16 [d])) -> (ConstBool [b2i(uint16(c) <= uint16(d))]) 506 (Leq8U (Const8 [c]) (Const8 [d])) -> (ConstBool [b2i(uint8(c) <= uint8(d))]) 507 508 // simplifications 509 (Or64 x x) -> x 510 (Or32 x x) -> x 511 (Or16 x x) -> x 512 (Or8 x x) -> x 513 (Or64 (Const64 [0]) x) -> x 514 (Or32 (Const32 [0]) x) -> x 515 (Or16 (Const16 [0]) x) -> x 516 (Or8 (Const8 [0]) x) -> x 517 (Or64 (Const64 [-1]) _) -> (Const64 [-1]) 518 (Or32 (Const32 [-1]) _) -> (Const32 [-1]) 519 (Or16 (Const16 [-1]) _) -> (Const16 [-1]) 520 (Or8 (Const8 [-1]) _) -> (Const8 [-1]) 521 (And64 x x) -> x 522 (And32 x x) -> x 523 (And16 x x) -> x 524 (And8 x x) -> x 525 (And64 (Const64 [-1]) x) -> x 526 (And32 (Const32 [-1]) x) -> x 527 (And16 (Const16 [-1]) x) -> x 528 (And8 (Const8 [-1]) x) -> x 529 (And64 (Const64 [0]) _) -> (Const64 [0]) 530 (And32 (Const32 [0]) _) -> (Const32 [0]) 531 (And16 (Const16 [0]) _) -> (Const16 [0]) 532 (And8 (Const8 [0]) _) -> (Const8 [0]) 533 (Xor64 x x) -> (Const64 [0]) 534 (Xor32 x x) -> (Const32 [0]) 535 (Xor16 x x) -> (Const16 [0]) 536 (Xor8 x x) -> (Const8 [0]) 537 (Xor64 (Const64 [0]) x) -> x 538 (Xor32 (Const32 [0]) x) -> x 539 (Xor16 (Const16 [0]) x) -> x 540 (Xor8 (Const8 [0]) x) -> x 541 (Add64 (Const64 [0]) x) -> x 542 (Add32 (Const32 [0]) x) -> x 543 (Add16 (Const16 [0]) x) -> x 544 (Add8 (Const8 [0]) x) -> x 545 (Sub64 x x) -> (Const64 [0]) 546 (Sub32 x x) -> (Const32 [0]) 547 (Sub16 x x) -> (Const16 [0]) 548 (Sub8 x x) -> (Const8 [0]) 549 (Mul64 (Const64 [0]) _) -> (Const64 [0]) 550 (Mul32 (Const32 [0]) _) -> (Const32 [0]) 551 (Mul16 (Const16 [0]) _) -> (Const16 [0]) 552 (Mul8 (Const8 [0]) _) -> (Const8 [0]) 553 (Com8 (Com8 x)) -> x 554 (Com16 (Com16 x)) -> x 555 (Com32 (Com32 x)) -> x 556 (Com64 (Com64 x)) -> x 557 (Neg8 (Sub8 x y)) -> (Sub8 y x) 558 (Neg16 (Sub16 x y)) -> (Sub16 y x) 559 (Neg32 (Sub32 x y)) -> (Sub32 y x) 560 (Neg64 (Sub64 x y)) -> (Sub64 y x) 561 562 (And64 x (And64 x y)) -> (And64 x y) 563 (And32 x (And32 x y)) -> (And32 x y) 564 (And16 x (And16 x y)) -> (And16 x y) 565 (And8 x (And8 x y)) -> (And8 x y) 566 (And64 x (And64 y x)) -> (And64 x y) 567 (And32 x (And32 y x)) -> (And32 x y) 568 (And16 x (And16 y x)) -> (And16 x y) 569 (And8 x (And8 y x)) -> (And8 x y) 570 (And64 (And64 x y) x) -> (And64 x y) 571 (And32 (And32 x y) x) -> (And32 x y) 572 (And16 (And16 x y) x) -> (And16 x y) 573 (And8 (And8 x y) x) -> (And8 x y) 574 (And64 (And64 x y) y) -> (And64 x y) 575 (And32 (And32 x y) y) -> (And32 x y) 576 (And16 (And16 x y) y) -> (And16 x y) 577 (And8 (And8 x y) y) -> (And8 x y) 578 (Or64 x (Or64 x y)) -> (Or64 x y) 579 (Or32 x (Or32 x y)) -> (Or32 x y) 580 (Or16 x (Or16 x y)) -> (Or16 x y) 581 (Or8 x (Or8 x y)) -> (Or8 x y) 582 (Or64 x (Or64 y x)) -> (Or64 x y) 583 (Or32 x (Or32 y x)) -> (Or32 x y) 584 (Or16 x (Or16 y x)) -> (Or16 x y) 585 (Or8 x (Or8 y x)) -> (Or8 x y) 586 (Or64 (Or64 x y) x) -> (Or64 x y) 587 (Or32 (Or32 x y) x) -> (Or32 x y) 588 (Or16 (Or16 x y) x) -> (Or16 x y) 589 (Or8 (Or8 x y) x) -> (Or8 x y) 590 (Or64 (Or64 x y) y) -> (Or64 x y) 591 (Or32 (Or32 x y) y) -> (Or32 x y) 592 (Or16 (Or16 x y) y) -> (Or16 x y) 593 (Or8 (Or8 x y) y) -> (Or8 x y) 594 (Xor64 x (Xor64 x y)) -> y 595 (Xor32 x (Xor32 x y)) -> y 596 (Xor16 x (Xor16 x y)) -> y 597 (Xor8 x (Xor8 x y)) -> y 598 (Xor64 x (Xor64 y x)) -> y 599 (Xor32 x (Xor32 y x)) -> y 600 (Xor16 x (Xor16 y x)) -> y 601 (Xor8 x (Xor8 y x)) -> y 602 (Xor64 (Xor64 x y) x) -> y 603 (Xor32 (Xor32 x y) x) -> y 604 (Xor16 (Xor16 x y) x) -> y 605 (Xor8 (Xor8 x y) x) -> y 606 (Xor64 (Xor64 x y) y) -> x 607 (Xor32 (Xor32 x y) y) -> x 608 (Xor16 (Xor16 x y) y) -> x 609 (Xor8 (Xor8 x y) y) -> x 610 611 (Trunc64to8 (And64 (Const64 [y]) x)) && y&0xFF == 0xFF -> (Trunc64to8 x) 612 (Trunc64to16 (And64 (Const64 [y]) x)) && y&0xFFFF == 0xFFFF -> (Trunc64to16 x) 613 (Trunc64to32 (And64 (Const64 [y]) x)) && y&0xFFFFFFFF == 0xFFFFFFFF -> (Trunc64to32 x) 614 (Trunc32to8 (And32 (Const32 [y]) x)) && y&0xFF == 0xFF -> (Trunc32to8 x) 615 (Trunc32to16 (And32 (Const32 [y]) x)) && y&0xFFFF == 0xFFFF -> (Trunc32to16 x) 616 (Trunc16to8 (And16 (Const16 [y]) x)) && y&0xFF == 0xFF -> (Trunc16to8 x) 617 618 (ZeroExt8to64 (Trunc64to8 x:(Rsh64Ux64 _ (Const64 [s])))) && s >= 56 -> x 619 (ZeroExt16to64 (Trunc64to16 x:(Rsh64Ux64 _ (Const64 [s])))) && s >= 48 -> x 620 (ZeroExt32to64 (Trunc64to32 x:(Rsh64Ux64 _ (Const64 [s])))) && s >= 32 -> x 621 (ZeroExt8to32 (Trunc32to8 x:(Rsh32Ux64 _ (Const64 [s])))) && s >= 24 -> x 622 (ZeroExt16to32 (Trunc32to16 x:(Rsh32Ux64 _ (Const64 [s])))) && s >= 16 -> x 623 (ZeroExt8to16 (Trunc16to8 x:(Rsh16Ux64 _ (Const64 [s])))) && s >= 8 -> x 624 625 (SignExt8to64 (Trunc64to8 x:(Rsh64x64 _ (Const64 [s])))) && s >= 56 -> x 626 (SignExt16to64 (Trunc64to16 x:(Rsh64x64 _ (Const64 [s])))) && s >= 48 -> x 627 (SignExt32to64 (Trunc64to32 x:(Rsh64x64 _ (Const64 [s])))) && s >= 32 -> x 628 (SignExt8to32 (Trunc32to8 x:(Rsh32x64 _ (Const64 [s])))) && s >= 24 -> x 629 (SignExt16to32 (Trunc32to16 x:(Rsh32x64 _ (Const64 [s])))) && s >= 16 -> x 630 (SignExt8to16 (Trunc16to8 x:(Rsh16x64 _ (Const64 [s])))) && s >= 8 -> x 631 632 (Slicemask (Const32 [x])) && x > 0 -> (Const32 [-1]) 633 (Slicemask (Const32 [0])) -> (Const32 [0]) 634 (Slicemask (Const64 [x])) && x > 0 -> (Const64 [-1]) 635 (Slicemask (Const64 [0])) -> (Const64 [0]) 636 637 // Rewrite AND of consts as shifts if possible, slightly faster for 64 bit operands 638 // leading zeros can be shifted left, then right 639 (And64 <t> (Const64 [y]) x) && nlz(y) + nto(y) == 64 && nto(y) >= 32 640 -> (Rsh64Ux64 (Lsh64x64 <t> x (Const64 <t> [nlz(y)])) (Const64 <t> [nlz(y)])) 641 // trailing zeros can be shifted right, then left 642 (And64 <t> (Const64 [y]) x) && nlo(y) + ntz(y) == 64 && ntz(y) >= 32 643 -> (Lsh64x64 (Rsh64Ux64 <t> x (Const64 <t> [ntz(y)])) (Const64 <t> [ntz(y)])) 644 645 // simplifications often used for lengths. e.g. len(s[i:i+5])==5 646 (Sub64 (Add64 x y) x) -> y 647 (Sub64 (Add64 x y) y) -> x 648 (Sub32 (Add32 x y) x) -> y 649 (Sub32 (Add32 x y) y) -> x 650 (Sub16 (Add16 x y) x) -> y 651 (Sub16 (Add16 x y) y) -> x 652 (Sub8 (Add8 x y) x) -> y 653 (Sub8 (Add8 x y) y) -> x 654 655 // basic phi simplifications 656 (Phi (Const8 [c]) (Const8 [c])) -> (Const8 [c]) 657 (Phi (Const16 [c]) (Const16 [c])) -> (Const16 [c]) 658 (Phi (Const32 [c]) (Const32 [c])) -> (Const32 [c]) 659 (Phi (Const64 [c]) (Const64 [c])) -> (Const64 [c]) 660 661 // user nil checks 662 (NeqPtr p (ConstNil)) -> (IsNonNil p) 663 (NeqPtr (ConstNil) p) -> (IsNonNil p) 664 (EqPtr p (ConstNil)) -> (Not (IsNonNil p)) 665 (EqPtr (ConstNil) p) -> (Not (IsNonNil p)) 666 (IsNonNil (ConstNil)) -> (ConstBool [0]) 667 668 // slice and interface comparisons 669 // The frontend ensures that we can only compare against nil, 670 // so we need only compare the first word (interface type or slice ptr). 671 (EqInter x y) -> (EqPtr (ITab x) (ITab y)) 672 (NeqInter x y) -> (NeqPtr (ITab x) (ITab y)) 673 (EqSlice x y) -> (EqPtr (SlicePtr x) (SlicePtr y)) 674 (NeqSlice x y) -> (NeqPtr (SlicePtr x) (SlicePtr y)) 675 676 // Load of store of same address, with compatibly typed value and same size 677 (Load <t1> p1 (Store [w] p2 x _)) && isSamePtr(p1,p2) && t1.Compare(x.Type)==CMPeq && w == t1.Size() -> x 678 679 // Collapse OffPtr 680 (OffPtr (OffPtr p [b]) [a]) -> (OffPtr p [a+b]) 681 (OffPtr p [0]) && v.Type.Compare(p.Type) == CMPeq -> p 682 683 // indexing operations 684 // Note: bounds check has already been done 685 (PtrIndex <t> ptr idx) && config.PtrSize == 4 -> (AddPtr ptr (Mul32 <config.fe.TypeInt()> idx (Const32 <config.fe.TypeInt()> [t.ElemType().Size()]))) 686 (PtrIndex <t> ptr idx) && config.PtrSize == 8 -> (AddPtr ptr (Mul64 <config.fe.TypeInt()> idx (Const64 <config.fe.TypeInt()> [t.ElemType().Size()]))) 687 688 // struct operations 689 (StructSelect (StructMake1 x)) -> x 690 (StructSelect [0] (StructMake2 x _)) -> x 691 (StructSelect [1] (StructMake2 _ x)) -> x 692 (StructSelect [0] (StructMake3 x _ _)) -> x 693 (StructSelect [1] (StructMake3 _ x _)) -> x 694 (StructSelect [2] (StructMake3 _ _ x)) -> x 695 (StructSelect [0] (StructMake4 x _ _ _)) -> x 696 (StructSelect [1] (StructMake4 _ x _ _)) -> x 697 (StructSelect [2] (StructMake4 _ _ x _)) -> x 698 (StructSelect [3] (StructMake4 _ _ _ x)) -> x 699 700 (Load <t> _ _) && t.IsStruct() && t.NumFields() == 0 && config.fe.CanSSA(t) -> 701 (StructMake0) 702 (Load <t> ptr mem) && t.IsStruct() && t.NumFields() == 1 && config.fe.CanSSA(t) -> 703 (StructMake1 704 (Load <t.FieldType(0)> ptr mem)) 705 (Load <t> ptr mem) && t.IsStruct() && t.NumFields() == 2 && config.fe.CanSSA(t) -> 706 (StructMake2 707 (Load <t.FieldType(0)> ptr mem) 708 (Load <t.FieldType(1)> (OffPtr <t.FieldType(1).PtrTo()> [t.FieldOff(1)] ptr) mem)) 709 (Load <t> ptr mem) && t.IsStruct() && t.NumFields() == 3 && config.fe.CanSSA(t) -> 710 (StructMake3 711 (Load <t.FieldType(0)> ptr mem) 712 (Load <t.FieldType(1)> (OffPtr <t.FieldType(1).PtrTo()> [t.FieldOff(1)] ptr) mem) 713 (Load <t.FieldType(2)> (OffPtr <t.FieldType(2).PtrTo()> [t.FieldOff(2)] ptr) mem)) 714 (Load <t> ptr mem) && t.IsStruct() && t.NumFields() == 4 && config.fe.CanSSA(t) -> 715 (StructMake4 716 (Load <t.FieldType(0)> ptr mem) 717 (Load <t.FieldType(1)> (OffPtr <t.FieldType(1).PtrTo()> [t.FieldOff(1)] ptr) mem) 718 (Load <t.FieldType(2)> (OffPtr <t.FieldType(2).PtrTo()> [t.FieldOff(2)] ptr) mem) 719 (Load <t.FieldType(3)> (OffPtr <t.FieldType(3).PtrTo()> [t.FieldOff(3)] ptr) mem)) 720 721 (StructSelect [i] x:(Load <t> ptr mem)) && !config.fe.CanSSA(t) -> 722 @x.Block (Load <v.Type> (OffPtr <v.Type.PtrTo()> [t.FieldOff(int(i))] ptr) mem) 723 724 (Store _ (StructMake0) mem) -> mem 725 (Store dst (StructMake1 <t> f0) mem) -> 726 (Store [t.FieldType(0).Size()] dst f0 mem) 727 (Store dst (StructMake2 <t> f0 f1) mem) -> 728 (Store [t.FieldType(1).Size()] 729 (OffPtr <t.FieldType(1).PtrTo()> [t.FieldOff(1)] dst) 730 f1 731 (Store [t.FieldType(0).Size()] dst f0 mem)) 732 (Store dst (StructMake3 <t> f0 f1 f2) mem) -> 733 (Store [t.FieldType(2).Size()] 734 (OffPtr <t.FieldType(2).PtrTo()> [t.FieldOff(2)] dst) 735 f2 736 (Store [t.FieldType(1).Size()] 737 (OffPtr <t.FieldType(1).PtrTo()> [t.FieldOff(1)] dst) 738 f1 739 (Store [t.FieldType(0).Size()] dst f0 mem))) 740 (Store dst (StructMake4 <t> f0 f1 f2 f3) mem) -> 741 (Store [t.FieldType(3).Size()] 742 (OffPtr <t.FieldType(3).PtrTo()> [t.FieldOff(3)] dst) 743 f3 744 (Store [t.FieldType(2).Size()] 745 (OffPtr <t.FieldType(2).PtrTo()> [t.FieldOff(2)] dst) 746 f2 747 (Store [t.FieldType(1).Size()] 748 (OffPtr <t.FieldType(1).PtrTo()> [t.FieldOff(1)] dst) 749 f1 750 (Store [t.FieldType(0).Size()] dst f0 mem)))) 751 752 // Putting struct{*byte} and similar into direct interfaces. 753 (IMake typ (StructMake1 val)) -> (IMake typ val) 754 (StructSelect [0] x:(IData _)) -> x 755 756 // un-SSAable values use mem->mem copies 757 (Store [size] dst (Load <t> src mem) mem) && !config.fe.CanSSA(t) -> 758 (Move [MakeSizeAndAlign(size, t.Alignment()).Int64()] dst src mem) 759 (Store [size] dst (Load <t> src mem) (VarDef {x} mem)) && !config.fe.CanSSA(t) -> 760 (Move [MakeSizeAndAlign(size, t.Alignment()).Int64()] dst src (VarDef {x} mem)) 761 762 // array ops 763 (ArraySelect (ArrayMake1 x)) -> x 764 765 (Load <t> _ _) && t.IsArray() && t.NumElem() == 0 -> 766 (ArrayMake0) 767 768 (Load <t> ptr mem) && t.IsArray() && t.NumElem() == 1 && config.fe.CanSSA(t) -> 769 (ArrayMake1 (Load <t.ElemType()> ptr mem)) 770 771 (Store _ (ArrayMake0) mem) -> mem 772 (Store [size] dst (ArrayMake1 e) mem) -> (Store [size] dst e mem) 773 774 (ArraySelect [0] (Load ptr mem)) -> (Load ptr mem) 775 776 // Putting [1]{*byte} and similar into direct interfaces. 777 (IMake typ (ArrayMake1 val)) -> (IMake typ val) 778 (ArraySelect [0] x:(IData _)) -> x 779 780 // string ops 781 // Decomposing StringMake and lowering of StringPtr and StringLen 782 // happens in a later pass, dec, so that these operations are available 783 // to other passes for optimizations. 784 (StringPtr (StringMake (Const64 <t> [c]) _)) -> (Const64 <t> [c]) 785 (StringLen (StringMake _ (Const64 <t> [c]))) -> (Const64 <t> [c]) 786 (ConstString {s}) && config.PtrSize == 4 && s.(string) == "" -> 787 (StringMake (ConstNil) (Const32 <config.fe.TypeInt()> [0])) 788 (ConstString {s}) && config.PtrSize == 8 && s.(string) == "" -> 789 (StringMake (ConstNil) (Const64 <config.fe.TypeInt()> [0])) 790 (ConstString {s}) && config.PtrSize == 4 && s.(string) != "" -> 791 (StringMake 792 (Addr <config.fe.TypeBytePtr()> {config.fe.StringData(s.(string))} 793 (SB)) 794 (Const32 <config.fe.TypeInt()> [int64(len(s.(string)))])) 795 (ConstString {s}) && config.PtrSize == 8 && s.(string) != "" -> 796 (StringMake 797 (Addr <config.fe.TypeBytePtr()> {config.fe.StringData(s.(string))} 798 (SB)) 799 (Const64 <config.fe.TypeInt()> [int64(len(s.(string)))])) 800 801 // slice ops 802 // Only a few slice rules are provided here. See dec.rules for 803 // a more comprehensive set. 804 (SliceLen (SliceMake _ (Const64 <t> [c]) _)) -> (Const64 <t> [c]) 805 (SliceCap (SliceMake _ _ (Const64 <t> [c]))) -> (Const64 <t> [c]) 806 (SliceLen (SliceMake _ (Const32 <t> [c]) _)) -> (Const32 <t> [c]) 807 (SliceCap (SliceMake _ _ (Const32 <t> [c]))) -> (Const32 <t> [c]) 808 (SlicePtr (SliceMake (SlicePtr x) _ _)) -> (SlicePtr x) 809 (SliceLen (SliceMake _ (SliceLen x) _)) -> (SliceLen x) 810 (SliceCap (SliceMake _ _ (SliceCap x))) -> (SliceCap x) 811 (SliceCap (SliceMake _ _ (SliceLen x))) -> (SliceLen x) 812 (ConstSlice) && config.PtrSize == 4 -> 813 (SliceMake 814 (ConstNil <v.Type.ElemType().PtrTo()>) 815 (Const32 <config.fe.TypeInt()> [0]) 816 (Const32 <config.fe.TypeInt()> [0])) 817 (ConstSlice) && config.PtrSize == 8 -> 818 (SliceMake 819 (ConstNil <v.Type.ElemType().PtrTo()>) 820 (Const64 <config.fe.TypeInt()> [0]) 821 (Const64 <config.fe.TypeInt()> [0])) 822 823 // interface ops 824 (ConstInterface) -> 825 (IMake 826 (ConstNil <config.fe.TypeBytePtr()>) 827 (ConstNil <config.fe.TypeBytePtr()>)) 828 829 (NilCheck (GetG mem) mem) -> mem 830 831 (If (Not cond) yes no) -> (If cond no yes) 832 (If (ConstBool [c]) yes no) && c == 1 -> (First nil yes no) 833 (If (ConstBool [c]) yes no) && c == 0 -> (First nil no yes) 834 835 // Get rid of Convert ops for pointer arithmetic on unsafe.Pointer. 836 (Convert (Add64 (Convert ptr mem) off) mem) -> (Add64 ptr off) 837 (Convert (Add64 off (Convert ptr mem)) mem) -> (Add64 ptr off) 838 (Convert (Convert ptr mem) mem) -> ptr 839 840 // Decompose compound argument values 841 (Arg {n} [off]) && v.Type.IsString() -> 842 (StringMake 843 (Arg <config.fe.TypeBytePtr()> {n} [off]) 844 (Arg <config.fe.TypeInt()> {n} [off+config.PtrSize])) 845 846 (Arg {n} [off]) && v.Type.IsSlice() -> 847 (SliceMake 848 (Arg <v.Type.ElemType().PtrTo()> {n} [off]) 849 (Arg <config.fe.TypeInt()> {n} [off+config.PtrSize]) 850 (Arg <config.fe.TypeInt()> {n} [off+2*config.PtrSize])) 851 852 (Arg {n} [off]) && v.Type.IsInterface() -> 853 (IMake 854 (Arg <config.fe.TypeBytePtr()> {n} [off]) 855 (Arg <config.fe.TypeBytePtr()> {n} [off+config.PtrSize])) 856 857 (Arg {n} [off]) && v.Type.IsComplex() && v.Type.Size() == 16 -> 858 (ComplexMake 859 (Arg <config.fe.TypeFloat64()> {n} [off]) 860 (Arg <config.fe.TypeFloat64()> {n} [off+8])) 861 862 (Arg {n} [off]) && v.Type.IsComplex() && v.Type.Size() == 8 -> 863 (ComplexMake 864 (Arg <config.fe.TypeFloat32()> {n} [off]) 865 (Arg <config.fe.TypeFloat32()> {n} [off+4])) 866 867 (Arg <t>) && t.IsStruct() && t.NumFields() == 0 && config.fe.CanSSA(t) -> 868 (StructMake0) 869 (Arg <t> {n} [off]) && t.IsStruct() && t.NumFields() == 1 && config.fe.CanSSA(t) -> 870 (StructMake1 871 (Arg <t.FieldType(0)> {n} [off+t.FieldOff(0)])) 872 (Arg <t> {n} [off]) && t.IsStruct() && t.NumFields() == 2 && config.fe.CanSSA(t) -> 873 (StructMake2 874 (Arg <t.FieldType(0)> {n} [off+t.FieldOff(0)]) 875 (Arg <t.FieldType(1)> {n} [off+t.FieldOff(1)])) 876 (Arg <t> {n} [off]) && t.IsStruct() && t.NumFields() == 3 && config.fe.CanSSA(t) -> 877 (StructMake3 878 (Arg <t.FieldType(0)> {n} [off+t.FieldOff(0)]) 879 (Arg <t.FieldType(1)> {n} [off+t.FieldOff(1)]) 880 (Arg <t.FieldType(2)> {n} [off+t.FieldOff(2)])) 881 (Arg <t> {n} [off]) && t.IsStruct() && t.NumFields() == 4 && config.fe.CanSSA(t) -> 882 (StructMake4 883 (Arg <t.FieldType(0)> {n} [off+t.FieldOff(0)]) 884 (Arg <t.FieldType(1)> {n} [off+t.FieldOff(1)]) 885 (Arg <t.FieldType(2)> {n} [off+t.FieldOff(2)]) 886 (Arg <t.FieldType(3)> {n} [off+t.FieldOff(3)])) 887 888 (Arg <t>) && t.IsArray() && t.NumElem() == 0 -> 889 (ArrayMake0) 890 (Arg <t> {n} [off]) && t.IsArray() && t.NumElem() == 1 && config.fe.CanSSA(t) -> 891 (ArrayMake1 (Arg <t.ElemType()> {n} [off])) 892 893 // strength reduction of divide by a constant. 894 // Note: frontend does <=32 bits. We only need to do 64 bits here. 895 // TODO: Do them all here? 896 897 // Div/mod by 1. Currently handled by frontend. 898 //(Div64 n (Const64 [1])) -> n 899 //(Div64u n (Const64 [1])) -> n 900 //(Mod64 n (Const64 [1])) -> (Const64 [0]) 901 //(Mod64u n (Const64 [1])) -> (Const64 [0]) 902 903 // Unsigned divide by power of 2. 904 (Div64u <t> n (Const64 [c])) && isPowerOfTwo(c) -> (Rsh64Ux64 n (Const64 <t> [log2(c)])) 905 (Mod64u <t> n (Const64 [c])) && isPowerOfTwo(c) -> (And64 n (Const64 <t> [c-1])) 906 907 // Signed divide by power of 2. Currently handled by frontend. 908 // n / c = n >> log(c) if n >= 0 909 // = (n+c-1) >> log(c) if n < 0 910 // We conditionally add c-1 by adding n>>63>>(64-log(c)) (first shift signed, second shift unsigned). 911 //(Div64 <t> n (Const64 [c])) && isPowerOfTwo(c) -> 912 // (Rsh64x64 913 // (Add64 <t> 914 // n 915 // (Rsh64Ux64 <t> 916 // (Rsh64x64 <t> n (Const64 <t> [63])) 917 // (Const64 <t> [64-log2(c)]))) 918 // (Const64 <t> [log2(c)])) 919 920 // Unsigned divide, not a power of 2. Strength reduce to a multiply. 921 (Div64u <t> x (Const64 [c])) && umagic64ok(c) && !umagic64a(c) -> 922 (Rsh64Ux64 923 (Hmul64u <t> 924 (Const64 <t> [umagic64m(c)]) 925 x) 926 (Const64 <t> [umagic64s(c)])) 927 (Div64u <t> x (Const64 [c])) && umagic64ok(c) && umagic64a(c) -> 928 (Rsh64Ux64 929 (Avg64u <t> 930 (Hmul64u <t> 931 x 932 (Const64 <t> [umagic64m(c)])) 933 x) 934 (Const64 <t> [umagic64s(c)-1])) 935 936 // Signed divide, not a power of 2. Strength reduce to a multiply. 937 (Div64 <t> x (Const64 [c])) && c > 0 && smagic64ok(c) && smagic64m(c) > 0 -> 938 (Sub64 <t> 939 (Rsh64x64 <t> 940 (Hmul64 <t> 941 (Const64 <t> [smagic64m(c)]) 942 x) 943 (Const64 <t> [smagic64s(c)])) 944 (Rsh64x64 <t> 945 x 946 (Const64 <t> [63]))) 947 (Div64 <t> x (Const64 [c])) && c > 0 && smagic64ok(c) && smagic64m(c) < 0 -> 948 (Sub64 <t> 949 (Rsh64x64 <t> 950 (Add64 <t> 951 (Hmul64 <t> 952 (Const64 <t> [smagic64m(c)]) 953 x) 954 x) 955 (Const64 <t> [smagic64s(c)])) 956 (Rsh64x64 <t> 957 x 958 (Const64 <t> [63]))) 959 (Div64 <t> x (Const64 [c])) && c < 0 && smagic64ok(c) && smagic64m(c) > 0 -> 960 (Neg64 <t> 961 (Sub64 <t> 962 (Rsh64x64 <t> 963 (Hmul64 <t> 964 (Const64 <t> [smagic64m(c)]) 965 x) 966 (Const64 <t> [smagic64s(c)])) 967 (Rsh64x64 <t> 968 x 969 (Const64 <t> [63])))) 970 (Div64 <t> x (Const64 [c])) && c < 0 && smagic64ok(c) && smagic64m(c) < 0 -> 971 (Neg64 <t> 972 (Sub64 <t> 973 (Rsh64x64 <t> 974 (Add64 <t> 975 (Hmul64 <t> 976 (Const64 <t> [smagic64m(c)]) 977 x) 978 x) 979 (Const64 <t> [smagic64s(c)])) 980 (Rsh64x64 <t> 981 x 982 (Const64 <t> [63])))) 983 984 // A%B = A-(A/B*B). 985 // This implements % with two * and a bunch of ancillary ops. 986 // One of the * is free if the user's code also computes A/B. 987 (Mod64 <t> x (Const64 [c])) && x.Op != OpConst64 && smagic64ok(c) 988 -> (Sub64 x (Mul64 <t> (Div64 <t> x (Const64 <t> [c])) (Const64 <t> [c]))) 989 (Mod64u <t> x (Const64 [c])) && x.Op != OpConst64 && umagic64ok(c) 990 -> (Sub64 x (Mul64 <t> (Div64u <t> x (Const64 <t> [c])) (Const64 <t> [c]))) 991 992 // floating point optimizations 993 (Add32F x (Const32F [0])) -> x 994 (Add32F (Const32F [0]) x) -> x 995 (Add64F x (Const64F [0])) -> x 996 (Add64F (Const64F [0]) x) -> x 997 (Sub32F x (Const32F [0])) -> x 998 (Sub64F x (Const64F [0])) -> x 999 (Mul32F x (Const32F [f2i(1)])) -> x 1000 (Mul32F (Const32F [f2i(1)]) x) -> x 1001 (Mul64F x (Const64F [f2i(1)])) -> x 1002 (Mul64F (Const64F [f2i(1)]) x) -> x 1003 (Mul32F x (Const32F [f2i(-1)])) -> (Neg32F x) 1004 (Mul32F (Const32F [f2i(-1)]) x) -> (Neg32F x) 1005 (Mul64F x (Const64F [f2i(-1)])) -> (Neg64F x) 1006 (Mul64F (Const64F [f2i(-1)]) x) -> (Neg64F x) 1007 (Div32F x (Const32F [f2i(1)])) -> x 1008 (Div64F x (Const64F [f2i(1)])) -> x 1009 (Div32F x (Const32F [f2i(-1)])) -> (Neg32F x) 1010 (Div64F x (Const64F [f2i(-1)])) -> (Neg32F x) 1011 1012 (Sqrt (Const64F [c])) -> (Const64F [f2i(math.Sqrt(i2f(c)))]) 1013 1014 // recognize runtime.newobject and don't Zero/Nilcheck it 1015 (Zero (Load (OffPtr [c] (SP)) mem) mem) 1016 && mem.Op == OpStaticCall 1017 && isSameSym(mem.Aux, "runtime.newobject") 1018 && c == config.ctxt.FixedFrameSize() + config.PtrSize // offset of return value 1019 -> mem 1020 // nil checks just need to rewrite to something useless. 1021 // they will be deadcode eliminated soon afterwards. 1022 (NilCheck (Load (OffPtr [c] (SP)) mem) mem) 1023 && mem.Op == OpStaticCall 1024 && isSameSym(mem.Aux, "runtime.newobject") 1025 && c == config.ctxt.FixedFrameSize() + config.RegSize // offset of return value 1026 && warnRule(config.Debug_checknil() && v.Pos.Line() > 1, v, "removed nil check") 1027 -> (Invalid) 1028 (NilCheck (OffPtr (Load (OffPtr [c] (SP)) mem)) mem) 1029 && mem.Op == OpStaticCall 1030 && isSameSym(mem.Aux, "runtime.newobject") 1031 && c == config.ctxt.FixedFrameSize() + config.RegSize // offset of return value 1032 && warnRule(config.Debug_checknil() && v.Pos.Line() > 1, v, "removed nil check") 1033 -> (Invalid)