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