Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1 | // Copyright 2014 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "src/compiler/machine-operator-reducer.h" |
| 6 | |
| 7 | #include "src/base/bits.h" |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 8 | #include "src/base/division-by-constant.h" |
| 9 | #include "src/codegen.h" |
| 10 | #include "src/compiler/diamond.h" |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 11 | #include "src/compiler/graph.h" |
| 12 | #include "src/compiler/js-graph.h" |
| 13 | #include "src/compiler/node-matchers.h" |
| 14 | |
| 15 | namespace v8 { |
| 16 | namespace internal { |
| 17 | namespace compiler { |
| 18 | |
| 19 | MachineOperatorReducer::MachineOperatorReducer(JSGraph* jsgraph) |
| 20 | : jsgraph_(jsgraph) {} |
| 21 | |
| 22 | |
| 23 | MachineOperatorReducer::~MachineOperatorReducer() {} |
| 24 | |
| 25 | |
| 26 | Node* MachineOperatorReducer::Float32Constant(volatile float value) { |
| 27 | return graph()->NewNode(common()->Float32Constant(value)); |
| 28 | } |
| 29 | |
| 30 | |
| 31 | Node* MachineOperatorReducer::Float64Constant(volatile double value) { |
| 32 | return jsgraph()->Float64Constant(value); |
| 33 | } |
| 34 | |
| 35 | |
| 36 | Node* MachineOperatorReducer::Int32Constant(int32_t value) { |
| 37 | return jsgraph()->Int32Constant(value); |
| 38 | } |
| 39 | |
| 40 | |
| 41 | Node* MachineOperatorReducer::Int64Constant(int64_t value) { |
| 42 | return graph()->NewNode(common()->Int64Constant(value)); |
| 43 | } |
| 44 | |
| 45 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 46 | Node* MachineOperatorReducer::Word32And(Node* lhs, Node* rhs) { |
| 47 | Node* const node = graph()->NewNode(machine()->Word32And(), lhs, rhs); |
| 48 | Reduction const reduction = ReduceWord32And(node); |
| 49 | return reduction.Changed() ? reduction.replacement() : node; |
| 50 | } |
| 51 | |
| 52 | |
| 53 | Node* MachineOperatorReducer::Word32Sar(Node* lhs, uint32_t rhs) { |
| 54 | if (rhs == 0) return lhs; |
| 55 | return graph()->NewNode(machine()->Word32Sar(), lhs, Uint32Constant(rhs)); |
| 56 | } |
| 57 | |
| 58 | |
| 59 | Node* MachineOperatorReducer::Word32Shr(Node* lhs, uint32_t rhs) { |
| 60 | if (rhs == 0) return lhs; |
| 61 | return graph()->NewNode(machine()->Word32Shr(), lhs, Uint32Constant(rhs)); |
| 62 | } |
| 63 | |
| 64 | |
| 65 | Node* MachineOperatorReducer::Word32Equal(Node* lhs, Node* rhs) { |
| 66 | return graph()->NewNode(machine()->Word32Equal(), lhs, rhs); |
| 67 | } |
| 68 | |
| 69 | |
| 70 | Node* MachineOperatorReducer::Int32Add(Node* lhs, Node* rhs) { |
| 71 | Node* const node = graph()->NewNode(machine()->Int32Add(), lhs, rhs); |
| 72 | Reduction const reduction = ReduceInt32Add(node); |
| 73 | return reduction.Changed() ? reduction.replacement() : node; |
| 74 | } |
| 75 | |
| 76 | |
| 77 | Node* MachineOperatorReducer::Int32Sub(Node* lhs, Node* rhs) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 78 | Node* const node = graph()->NewNode(machine()->Int32Sub(), lhs, rhs); |
| 79 | Reduction const reduction = ReduceInt32Sub(node); |
| 80 | return reduction.Changed() ? reduction.replacement() : node; |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 81 | } |
| 82 | |
| 83 | |
| 84 | Node* MachineOperatorReducer::Int32Mul(Node* lhs, Node* rhs) { |
| 85 | return graph()->NewNode(machine()->Int32Mul(), lhs, rhs); |
| 86 | } |
| 87 | |
| 88 | |
| 89 | Node* MachineOperatorReducer::Int32Div(Node* dividend, int32_t divisor) { |
| 90 | DCHECK_NE(0, divisor); |
| 91 | DCHECK_NE(std::numeric_limits<int32_t>::min(), divisor); |
| 92 | base::MagicNumbersForDivision<uint32_t> const mag = |
| 93 | base::SignedDivisionByConstant(bit_cast<uint32_t>(divisor)); |
| 94 | Node* quotient = graph()->NewNode(machine()->Int32MulHigh(), dividend, |
| 95 | Uint32Constant(mag.multiplier)); |
| 96 | if (divisor > 0 && bit_cast<int32_t>(mag.multiplier) < 0) { |
| 97 | quotient = Int32Add(quotient, dividend); |
| 98 | } else if (divisor < 0 && bit_cast<int32_t>(mag.multiplier) > 0) { |
| 99 | quotient = Int32Sub(quotient, dividend); |
| 100 | } |
| 101 | return Int32Add(Word32Sar(quotient, mag.shift), Word32Shr(dividend, 31)); |
| 102 | } |
| 103 | |
| 104 | |
| 105 | Node* MachineOperatorReducer::Uint32Div(Node* dividend, uint32_t divisor) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 106 | DCHECK_LT(0u, divisor); |
| 107 | // If the divisor is even, we can avoid using the expensive fixup by shifting |
| 108 | // the dividend upfront. |
| 109 | unsigned const shift = base::bits::CountTrailingZeros32(divisor); |
| 110 | dividend = Word32Shr(dividend, shift); |
| 111 | divisor >>= shift; |
| 112 | // Compute the magic number for the (shifted) divisor. |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 113 | base::MagicNumbersForDivision<uint32_t> const mag = |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 114 | base::UnsignedDivisionByConstant(divisor, shift); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 115 | Node* quotient = graph()->NewNode(machine()->Uint32MulHigh(), dividend, |
| 116 | Uint32Constant(mag.multiplier)); |
| 117 | if (mag.add) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 118 | DCHECK_LE(1u, mag.shift); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 119 | quotient = Word32Shr( |
| 120 | Int32Add(Word32Shr(Int32Sub(dividend, quotient), 1), quotient), |
| 121 | mag.shift - 1); |
| 122 | } else { |
| 123 | quotient = Word32Shr(quotient, mag.shift); |
| 124 | } |
| 125 | return quotient; |
| 126 | } |
| 127 | |
| 128 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 129 | // Perform constant folding and strength reduction on machine operators. |
| 130 | Reduction MachineOperatorReducer::Reduce(Node* node) { |
| 131 | switch (node->opcode()) { |
| 132 | case IrOpcode::kProjection: |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 133 | return ReduceProjection(ProjectionIndexOf(node->op()), node->InputAt(0)); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 134 | case IrOpcode::kWord32And: |
| 135 | return ReduceWord32And(node); |
| 136 | case IrOpcode::kWord32Or: |
| 137 | return ReduceWord32Or(node); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 138 | case IrOpcode::kWord32Xor: { |
| 139 | Int32BinopMatcher m(node); |
| 140 | if (m.right().Is(0)) return Replace(m.left().node()); // x ^ 0 => x |
| 141 | if (m.IsFoldable()) { // K ^ K => K |
| 142 | return ReplaceInt32(m.left().Value() ^ m.right().Value()); |
| 143 | } |
| 144 | if (m.LeftEqualsRight()) return ReplaceInt32(0); // x ^ x => 0 |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 145 | if (m.left().IsWord32Xor() && m.right().Is(-1)) { |
| 146 | Int32BinopMatcher mleft(m.left().node()); |
| 147 | if (mleft.right().Is(-1)) { // (x ^ -1) ^ -1 => x |
| 148 | return Replace(mleft.left().node()); |
| 149 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 150 | } |
| 151 | break; |
| 152 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 153 | case IrOpcode::kWord32Shl: |
| 154 | return ReduceWord32Shl(node); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 155 | case IrOpcode::kWord32Shr: { |
| 156 | Uint32BinopMatcher m(node); |
| 157 | if (m.right().Is(0)) return Replace(m.left().node()); // x >>> 0 => x |
| 158 | if (m.IsFoldable()) { // K >>> K => K |
| 159 | return ReplaceInt32(m.left().Value() >> m.right().Value()); |
| 160 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 161 | return ReduceWord32Shifts(node); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 162 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 163 | case IrOpcode::kWord32Sar: |
| 164 | return ReduceWord32Sar(node); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 165 | case IrOpcode::kWord32Ror: { |
| 166 | Int32BinopMatcher m(node); |
| 167 | if (m.right().Is(0)) return Replace(m.left().node()); // x ror 0 => x |
| 168 | if (m.IsFoldable()) { // K ror K => K |
| 169 | return ReplaceInt32( |
| 170 | base::bits::RotateRight32(m.left().Value(), m.right().Value())); |
| 171 | } |
| 172 | break; |
| 173 | } |
| 174 | case IrOpcode::kWord32Equal: { |
| 175 | Int32BinopMatcher m(node); |
| 176 | if (m.IsFoldable()) { // K == K => K |
| 177 | return ReplaceBool(m.left().Value() == m.right().Value()); |
| 178 | } |
| 179 | if (m.left().IsInt32Sub() && m.right().Is(0)) { // x - y == 0 => x == y |
| 180 | Int32BinopMatcher msub(m.left().node()); |
| 181 | node->ReplaceInput(0, msub.left().node()); |
| 182 | node->ReplaceInput(1, msub.right().node()); |
| 183 | return Changed(node); |
| 184 | } |
| 185 | // TODO(turbofan): fold HeapConstant, ExternalReference, pointer compares |
| 186 | if (m.LeftEqualsRight()) return ReplaceBool(true); // x == x => true |
| 187 | break; |
| 188 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 189 | case IrOpcode::kWord64Equal: { |
| 190 | Int64BinopMatcher m(node); |
| 191 | if (m.IsFoldable()) { // K == K => K |
| 192 | return ReplaceBool(m.left().Value() == m.right().Value()); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 193 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 194 | if (m.left().IsInt64Sub() && m.right().Is(0)) { // x - y == 0 => x == y |
| 195 | Int64BinopMatcher msub(m.left().node()); |
| 196 | node->ReplaceInput(0, msub.left().node()); |
| 197 | node->ReplaceInput(1, msub.right().node()); |
| 198 | return Changed(node); |
| 199 | } |
| 200 | // TODO(turbofan): fold HeapConstant, ExternalReference, pointer compares |
| 201 | if (m.LeftEqualsRight()) return ReplaceBool(true); // x == x => true |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 202 | break; |
| 203 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 204 | case IrOpcode::kInt32Add: |
| 205 | return ReduceInt32Add(node); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 206 | case IrOpcode::kInt32Sub: |
| 207 | return ReduceInt32Sub(node); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 208 | case IrOpcode::kInt32Mul: { |
| 209 | Int32BinopMatcher m(node); |
| 210 | if (m.right().Is(0)) return Replace(m.right().node()); // x * 0 => 0 |
| 211 | if (m.right().Is(1)) return Replace(m.left().node()); // x * 1 => x |
| 212 | if (m.IsFoldable()) { // K * K => K |
| 213 | return ReplaceInt32(m.left().Value() * m.right().Value()); |
| 214 | } |
| 215 | if (m.right().Is(-1)) { // x * -1 => 0 - x |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 216 | node->ReplaceInput(0, Int32Constant(0)); |
| 217 | node->ReplaceInput(1, m.left().node()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 218 | NodeProperties::ChangeOp(node, machine()->Int32Sub()); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 219 | return Changed(node); |
| 220 | } |
| 221 | if (m.right().IsPowerOf2()) { // x * 2^n => x << n |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 222 | node->ReplaceInput(1, Int32Constant(WhichPowerOf2(m.right().Value()))); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 223 | NodeProperties::ChangeOp(node, machine()->Word32Shl()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 224 | Reduction reduction = ReduceWord32Shl(node); |
| 225 | return reduction.Changed() ? reduction : Changed(node); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 226 | } |
| 227 | break; |
| 228 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 229 | case IrOpcode::kInt32Div: |
| 230 | return ReduceInt32Div(node); |
| 231 | case IrOpcode::kUint32Div: |
| 232 | return ReduceUint32Div(node); |
| 233 | case IrOpcode::kInt32Mod: |
| 234 | return ReduceInt32Mod(node); |
| 235 | case IrOpcode::kUint32Mod: |
| 236 | return ReduceUint32Mod(node); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 237 | case IrOpcode::kInt32LessThan: { |
| 238 | Int32BinopMatcher m(node); |
| 239 | if (m.IsFoldable()) { // K < K => K |
| 240 | return ReplaceBool(m.left().Value() < m.right().Value()); |
| 241 | } |
| 242 | if (m.left().IsInt32Sub() && m.right().Is(0)) { // x - y < 0 => x < y |
| 243 | Int32BinopMatcher msub(m.left().node()); |
| 244 | node->ReplaceInput(0, msub.left().node()); |
| 245 | node->ReplaceInput(1, msub.right().node()); |
| 246 | return Changed(node); |
| 247 | } |
| 248 | if (m.left().Is(0) && m.right().IsInt32Sub()) { // 0 < x - y => y < x |
| 249 | Int32BinopMatcher msub(m.right().node()); |
| 250 | node->ReplaceInput(0, msub.right().node()); |
| 251 | node->ReplaceInput(1, msub.left().node()); |
| 252 | return Changed(node); |
| 253 | } |
| 254 | if (m.LeftEqualsRight()) return ReplaceBool(false); // x < x => false |
| 255 | break; |
| 256 | } |
| 257 | case IrOpcode::kInt32LessThanOrEqual: { |
| 258 | Int32BinopMatcher m(node); |
| 259 | if (m.IsFoldable()) { // K <= K => K |
| 260 | return ReplaceBool(m.left().Value() <= m.right().Value()); |
| 261 | } |
| 262 | if (m.left().IsInt32Sub() && m.right().Is(0)) { // x - y <= 0 => x <= y |
| 263 | Int32BinopMatcher msub(m.left().node()); |
| 264 | node->ReplaceInput(0, msub.left().node()); |
| 265 | node->ReplaceInput(1, msub.right().node()); |
| 266 | return Changed(node); |
| 267 | } |
| 268 | if (m.left().Is(0) && m.right().IsInt32Sub()) { // 0 <= x - y => y <= x |
| 269 | Int32BinopMatcher msub(m.right().node()); |
| 270 | node->ReplaceInput(0, msub.right().node()); |
| 271 | node->ReplaceInput(1, msub.left().node()); |
| 272 | return Changed(node); |
| 273 | } |
| 274 | if (m.LeftEqualsRight()) return ReplaceBool(true); // x <= x => true |
| 275 | break; |
| 276 | } |
| 277 | case IrOpcode::kUint32LessThan: { |
| 278 | Uint32BinopMatcher m(node); |
| 279 | if (m.left().Is(kMaxUInt32)) return ReplaceBool(false); // M < x => false |
| 280 | if (m.right().Is(0)) return ReplaceBool(false); // x < 0 => false |
| 281 | if (m.IsFoldable()) { // K < K => K |
| 282 | return ReplaceBool(m.left().Value() < m.right().Value()); |
| 283 | } |
| 284 | if (m.LeftEqualsRight()) return ReplaceBool(false); // x < x => false |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 285 | if (m.left().IsWord32Sar() && m.right().HasValue()) { |
| 286 | Int32BinopMatcher mleft(m.left().node()); |
| 287 | if (mleft.right().HasValue()) { |
| 288 | // (x >> K) < C => x < (C << K) |
| 289 | // when C < (M >> K) |
| 290 | const uint32_t c = m.right().Value(); |
| 291 | const uint32_t k = mleft.right().Value() & 0x1f; |
| 292 | if (c < static_cast<uint32_t>(kMaxInt >> k)) { |
| 293 | node->ReplaceInput(0, mleft.left().node()); |
| 294 | node->ReplaceInput(1, Uint32Constant(c << k)); |
| 295 | return Changed(node); |
| 296 | } |
| 297 | // TODO(turbofan): else the comparison is always true. |
| 298 | } |
| 299 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 300 | break; |
| 301 | } |
| 302 | case IrOpcode::kUint32LessThanOrEqual: { |
| 303 | Uint32BinopMatcher m(node); |
| 304 | if (m.left().Is(0)) return ReplaceBool(true); // 0 <= x => true |
| 305 | if (m.right().Is(kMaxUInt32)) return ReplaceBool(true); // x <= M => true |
| 306 | if (m.IsFoldable()) { // K <= K => K |
| 307 | return ReplaceBool(m.left().Value() <= m.right().Value()); |
| 308 | } |
| 309 | if (m.LeftEqualsRight()) return ReplaceBool(true); // x <= x => true |
| 310 | break; |
| 311 | } |
| 312 | case IrOpcode::kFloat64Add: { |
| 313 | Float64BinopMatcher m(node); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 314 | if (m.right().IsNaN()) { // x + NaN => NaN |
| 315 | return Replace(m.right().node()); |
| 316 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 317 | if (m.IsFoldable()) { // K + K => K |
| 318 | return ReplaceFloat64(m.left().Value() + m.right().Value()); |
| 319 | } |
| 320 | break; |
| 321 | } |
| 322 | case IrOpcode::kFloat64Sub: { |
| 323 | Float64BinopMatcher m(node); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 324 | if (m.right().Is(0) && (Double(m.right().Value()).Sign() > 0)) { |
| 325 | return Replace(m.left().node()); // x - 0 => x |
| 326 | } |
| 327 | if (m.right().IsNaN()) { // x - NaN => NaN |
| 328 | return Replace(m.right().node()); |
| 329 | } |
| 330 | if (m.left().IsNaN()) { // NaN - x => NaN |
| 331 | return Replace(m.left().node()); |
| 332 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 333 | if (m.IsFoldable()) { // K - K => K |
| 334 | return ReplaceFloat64(m.left().Value() - m.right().Value()); |
| 335 | } |
| 336 | break; |
| 337 | } |
| 338 | case IrOpcode::kFloat64Mul: { |
| 339 | Float64BinopMatcher m(node); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 340 | if (m.right().Is(-1)) { // x * -1.0 => -0.0 - x |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 341 | node->ReplaceInput(0, Float64Constant(-0.0)); |
| 342 | node->ReplaceInput(1, m.left().node()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 343 | NodeProperties::ChangeOp(node, machine()->Float64Sub()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 344 | return Changed(node); |
| 345 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 346 | if (m.right().Is(1)) return Replace(m.left().node()); // x * 1.0 => x |
| 347 | if (m.right().IsNaN()) { // x * NaN => NaN |
| 348 | return Replace(m.right().node()); |
| 349 | } |
| 350 | if (m.IsFoldable()) { // K * K => K |
| 351 | return ReplaceFloat64(m.left().Value() * m.right().Value()); |
| 352 | } |
| 353 | break; |
| 354 | } |
| 355 | case IrOpcode::kFloat64Div: { |
| 356 | Float64BinopMatcher m(node); |
| 357 | if (m.right().Is(1)) return Replace(m.left().node()); // x / 1.0 => x |
| 358 | if (m.right().IsNaN()) { // x / NaN => NaN |
| 359 | return Replace(m.right().node()); |
| 360 | } |
| 361 | if (m.left().IsNaN()) { // NaN / x => NaN |
| 362 | return Replace(m.left().node()); |
| 363 | } |
| 364 | if (m.IsFoldable()) { // K / K => K |
| 365 | return ReplaceFloat64(m.left().Value() / m.right().Value()); |
| 366 | } |
| 367 | break; |
| 368 | } |
| 369 | case IrOpcode::kFloat64Mod: { |
| 370 | Float64BinopMatcher m(node); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 371 | if (m.right().Is(0)) { // x % 0 => NaN |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 372 | return ReplaceFloat64(std::numeric_limits<double>::quiet_NaN()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 373 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 374 | if (m.right().IsNaN()) { // x % NaN => NaN |
| 375 | return Replace(m.right().node()); |
| 376 | } |
| 377 | if (m.left().IsNaN()) { // NaN % x => NaN |
| 378 | return Replace(m.left().node()); |
| 379 | } |
| 380 | if (m.IsFoldable()) { // K % K => K |
| 381 | return ReplaceFloat64(modulo(m.left().Value(), m.right().Value())); |
| 382 | } |
| 383 | break; |
| 384 | } |
| 385 | case IrOpcode::kChangeFloat32ToFloat64: { |
| 386 | Float32Matcher m(node->InputAt(0)); |
| 387 | if (m.HasValue()) return ReplaceFloat64(m.Value()); |
| 388 | break; |
| 389 | } |
| 390 | case IrOpcode::kChangeFloat64ToInt32: { |
| 391 | Float64Matcher m(node->InputAt(0)); |
| 392 | if (m.HasValue()) return ReplaceInt32(FastD2I(m.Value())); |
| 393 | if (m.IsChangeInt32ToFloat64()) return Replace(m.node()->InputAt(0)); |
| 394 | break; |
| 395 | } |
| 396 | case IrOpcode::kChangeFloat64ToUint32: { |
| 397 | Float64Matcher m(node->InputAt(0)); |
| 398 | if (m.HasValue()) return ReplaceInt32(FastD2UI(m.Value())); |
| 399 | if (m.IsChangeUint32ToFloat64()) return Replace(m.node()->InputAt(0)); |
| 400 | break; |
| 401 | } |
| 402 | case IrOpcode::kChangeInt32ToFloat64: { |
| 403 | Int32Matcher m(node->InputAt(0)); |
| 404 | if (m.HasValue()) return ReplaceFloat64(FastI2D(m.Value())); |
| 405 | break; |
| 406 | } |
| 407 | case IrOpcode::kChangeInt32ToInt64: { |
| 408 | Int32Matcher m(node->InputAt(0)); |
| 409 | if (m.HasValue()) return ReplaceInt64(m.Value()); |
| 410 | break; |
| 411 | } |
| 412 | case IrOpcode::kChangeUint32ToFloat64: { |
| 413 | Uint32Matcher m(node->InputAt(0)); |
| 414 | if (m.HasValue()) return ReplaceFloat64(FastUI2D(m.Value())); |
| 415 | break; |
| 416 | } |
| 417 | case IrOpcode::kChangeUint32ToUint64: { |
| 418 | Uint32Matcher m(node->InputAt(0)); |
| 419 | if (m.HasValue()) return ReplaceInt64(static_cast<uint64_t>(m.Value())); |
| 420 | break; |
| 421 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 422 | case IrOpcode::kTruncateFloat64ToInt32: |
| 423 | return ReduceTruncateFloat64ToInt32(node); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 424 | case IrOpcode::kTruncateInt64ToInt32: { |
| 425 | Int64Matcher m(node->InputAt(0)); |
| 426 | if (m.HasValue()) return ReplaceInt32(static_cast<int32_t>(m.Value())); |
| 427 | if (m.IsChangeInt32ToInt64()) return Replace(m.node()->InputAt(0)); |
| 428 | break; |
| 429 | } |
| 430 | case IrOpcode::kTruncateFloat64ToFloat32: { |
| 431 | Float64Matcher m(node->InputAt(0)); |
| 432 | if (m.HasValue()) return ReplaceFloat32(DoubleToFloat32(m.Value())); |
| 433 | if (m.IsChangeFloat32ToFloat64()) return Replace(m.node()->InputAt(0)); |
| 434 | break; |
| 435 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 436 | case IrOpcode::kFloat64InsertLowWord32: |
| 437 | return ReduceFloat64InsertLowWord32(node); |
| 438 | case IrOpcode::kFloat64InsertHighWord32: |
| 439 | return ReduceFloat64InsertHighWord32(node); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 440 | case IrOpcode::kStore: |
| 441 | return ReduceStore(node); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 442 | case IrOpcode::kFloat64Equal: |
| 443 | case IrOpcode::kFloat64LessThan: |
| 444 | case IrOpcode::kFloat64LessThanOrEqual: |
| 445 | return ReduceFloat64Compare(node); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 446 | default: |
| 447 | break; |
| 448 | } |
| 449 | return NoChange(); |
| 450 | } |
| 451 | |
| 452 | |
| 453 | Reduction MachineOperatorReducer::ReduceInt32Add(Node* node) { |
| 454 | DCHECK_EQ(IrOpcode::kInt32Add, node->opcode()); |
| 455 | Int32BinopMatcher m(node); |
| 456 | if (m.right().Is(0)) return Replace(m.left().node()); // x + 0 => x |
| 457 | if (m.IsFoldable()) { // K + K => K |
| 458 | return ReplaceUint32(bit_cast<uint32_t>(m.left().Value()) + |
| 459 | bit_cast<uint32_t>(m.right().Value())); |
| 460 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 461 | if (m.left().IsInt32Sub()) { |
| 462 | Int32BinopMatcher mleft(m.left().node()); |
| 463 | if (mleft.left().Is(0)) { // (0 - x) + y => y - x |
| 464 | node->ReplaceInput(0, m.right().node()); |
| 465 | node->ReplaceInput(1, mleft.right().node()); |
| 466 | NodeProperties::ChangeOp(node, machine()->Int32Sub()); |
| 467 | Reduction const reduction = ReduceInt32Sub(node); |
| 468 | return reduction.Changed() ? reduction : Changed(node); |
| 469 | } |
| 470 | } |
| 471 | if (m.right().IsInt32Sub()) { |
| 472 | Int32BinopMatcher mright(m.right().node()); |
| 473 | if (mright.left().Is(0)) { // y + (0 - x) => y - x |
| 474 | node->ReplaceInput(1, mright.right().node()); |
| 475 | NodeProperties::ChangeOp(node, machine()->Int32Sub()); |
| 476 | Reduction const reduction = ReduceInt32Sub(node); |
| 477 | return reduction.Changed() ? reduction : Changed(node); |
| 478 | } |
| 479 | } |
| 480 | return NoChange(); |
| 481 | } |
| 482 | |
| 483 | |
| 484 | Reduction MachineOperatorReducer::ReduceInt32Sub(Node* node) { |
| 485 | DCHECK_EQ(IrOpcode::kInt32Sub, node->opcode()); |
| 486 | Int32BinopMatcher m(node); |
| 487 | if (m.right().Is(0)) return Replace(m.left().node()); // x - 0 => x |
| 488 | if (m.IsFoldable()) { // K - K => K |
| 489 | return ReplaceInt32(static_cast<uint32_t>(m.left().Value()) - |
| 490 | static_cast<uint32_t>(m.right().Value())); |
| 491 | } |
| 492 | if (m.LeftEqualsRight()) return ReplaceInt32(0); // x - x => 0 |
| 493 | if (m.right().HasValue()) { // x - K => x + -K |
| 494 | node->ReplaceInput(1, Int32Constant(-m.right().Value())); |
| 495 | NodeProperties::ChangeOp(node, machine()->Int32Add()); |
| 496 | Reduction const reduction = ReduceInt32Add(node); |
| 497 | return reduction.Changed() ? reduction : Changed(node); |
| 498 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 499 | return NoChange(); |
| 500 | } |
| 501 | |
| 502 | |
| 503 | Reduction MachineOperatorReducer::ReduceInt32Div(Node* node) { |
| 504 | Int32BinopMatcher m(node); |
| 505 | if (m.left().Is(0)) return Replace(m.left().node()); // 0 / x => 0 |
| 506 | if (m.right().Is(0)) return Replace(m.right().node()); // x / 0 => 0 |
| 507 | if (m.right().Is(1)) return Replace(m.left().node()); // x / 1 => x |
| 508 | if (m.IsFoldable()) { // K / K => K |
| 509 | return ReplaceInt32( |
| 510 | base::bits::SignedDiv32(m.left().Value(), m.right().Value())); |
| 511 | } |
| 512 | if (m.LeftEqualsRight()) { // x / x => x != 0 |
| 513 | Node* const zero = Int32Constant(0); |
| 514 | return Replace(Word32Equal(Word32Equal(m.left().node(), zero), zero)); |
| 515 | } |
| 516 | if (m.right().Is(-1)) { // x / -1 => 0 - x |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 517 | node->ReplaceInput(0, Int32Constant(0)); |
| 518 | node->ReplaceInput(1, m.left().node()); |
| 519 | node->TrimInputCount(2); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 520 | NodeProperties::ChangeOp(node, machine()->Int32Sub()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 521 | return Changed(node); |
| 522 | } |
| 523 | if (m.right().HasValue()) { |
| 524 | int32_t const divisor = m.right().Value(); |
| 525 | Node* const dividend = m.left().node(); |
| 526 | Node* quotient = dividend; |
| 527 | if (base::bits::IsPowerOfTwo32(Abs(divisor))) { |
| 528 | uint32_t const shift = WhichPowerOf2Abs(divisor); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 529 | DCHECK_NE(0u, shift); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 530 | if (shift > 1) { |
| 531 | quotient = Word32Sar(quotient, 31); |
| 532 | } |
| 533 | quotient = Int32Add(Word32Shr(quotient, 32u - shift), dividend); |
| 534 | quotient = Word32Sar(quotient, shift); |
| 535 | } else { |
| 536 | quotient = Int32Div(quotient, Abs(divisor)); |
| 537 | } |
| 538 | if (divisor < 0) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 539 | node->ReplaceInput(0, Int32Constant(0)); |
| 540 | node->ReplaceInput(1, quotient); |
| 541 | node->TrimInputCount(2); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 542 | NodeProperties::ChangeOp(node, machine()->Int32Sub()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 543 | return Changed(node); |
| 544 | } |
| 545 | return Replace(quotient); |
| 546 | } |
| 547 | return NoChange(); |
| 548 | } |
| 549 | |
| 550 | |
| 551 | Reduction MachineOperatorReducer::ReduceUint32Div(Node* node) { |
| 552 | Uint32BinopMatcher m(node); |
| 553 | if (m.left().Is(0)) return Replace(m.left().node()); // 0 / x => 0 |
| 554 | if (m.right().Is(0)) return Replace(m.right().node()); // x / 0 => 0 |
| 555 | if (m.right().Is(1)) return Replace(m.left().node()); // x / 1 => x |
| 556 | if (m.IsFoldable()) { // K / K => K |
| 557 | return ReplaceUint32( |
| 558 | base::bits::UnsignedDiv32(m.left().Value(), m.right().Value())); |
| 559 | } |
| 560 | if (m.LeftEqualsRight()) { // x / x => x != 0 |
| 561 | Node* const zero = Int32Constant(0); |
| 562 | return Replace(Word32Equal(Word32Equal(m.left().node(), zero), zero)); |
| 563 | } |
| 564 | if (m.right().HasValue()) { |
| 565 | Node* const dividend = m.left().node(); |
| 566 | uint32_t const divisor = m.right().Value(); |
| 567 | if (base::bits::IsPowerOfTwo32(divisor)) { // x / 2^n => x >> n |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 568 | node->ReplaceInput(1, Uint32Constant(WhichPowerOf2(m.right().Value()))); |
| 569 | node->TrimInputCount(2); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 570 | NodeProperties::ChangeOp(node, machine()->Word32Shr()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 571 | return Changed(node); |
| 572 | } else { |
| 573 | return Replace(Uint32Div(dividend, divisor)); |
| 574 | } |
| 575 | } |
| 576 | return NoChange(); |
| 577 | } |
| 578 | |
| 579 | |
| 580 | Reduction MachineOperatorReducer::ReduceInt32Mod(Node* node) { |
| 581 | Int32BinopMatcher m(node); |
| 582 | if (m.left().Is(0)) return Replace(m.left().node()); // 0 % x => 0 |
| 583 | if (m.right().Is(0)) return Replace(m.right().node()); // x % 0 => 0 |
| 584 | if (m.right().Is(1)) return ReplaceInt32(0); // x % 1 => 0 |
| 585 | if (m.right().Is(-1)) return ReplaceInt32(0); // x % -1 => 0 |
| 586 | if (m.LeftEqualsRight()) return ReplaceInt32(0); // x % x => 0 |
| 587 | if (m.IsFoldable()) { // K % K => K |
| 588 | return ReplaceInt32( |
| 589 | base::bits::SignedMod32(m.left().Value(), m.right().Value())); |
| 590 | } |
| 591 | if (m.right().HasValue()) { |
| 592 | Node* const dividend = m.left().node(); |
| 593 | int32_t const divisor = Abs(m.right().Value()); |
| 594 | if (base::bits::IsPowerOfTwo32(divisor)) { |
| 595 | uint32_t const mask = divisor - 1; |
| 596 | Node* const zero = Int32Constant(0); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 597 | node->ReplaceInput( |
| 598 | 0, graph()->NewNode(machine()->Int32LessThan(), dividend, zero)); |
| 599 | node->ReplaceInput( |
| 600 | 1, Int32Sub(zero, Word32And(Int32Sub(zero, dividend), mask))); |
| 601 | node->ReplaceInput(2, Word32And(dividend, mask)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 602 | NodeProperties::ChangeOp( |
| 603 | node, |
| 604 | common()->Select(MachineRepresentation::kWord32, BranchHint::kFalse)); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 605 | } else { |
| 606 | Node* quotient = Int32Div(dividend, divisor); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 607 | DCHECK_EQ(dividend, node->InputAt(0)); |
| 608 | node->ReplaceInput(1, Int32Mul(quotient, Int32Constant(divisor))); |
| 609 | node->TrimInputCount(2); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 610 | NodeProperties::ChangeOp(node, machine()->Int32Sub()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 611 | } |
| 612 | return Changed(node); |
| 613 | } |
| 614 | return NoChange(); |
| 615 | } |
| 616 | |
| 617 | |
| 618 | Reduction MachineOperatorReducer::ReduceUint32Mod(Node* node) { |
| 619 | Uint32BinopMatcher m(node); |
| 620 | if (m.left().Is(0)) return Replace(m.left().node()); // 0 % x => 0 |
| 621 | if (m.right().Is(0)) return Replace(m.right().node()); // x % 0 => 0 |
| 622 | if (m.right().Is(1)) return ReplaceUint32(0); // x % 1 => 0 |
| 623 | if (m.LeftEqualsRight()) return ReplaceInt32(0); // x % x => 0 |
| 624 | if (m.IsFoldable()) { // K % K => K |
| 625 | return ReplaceUint32( |
| 626 | base::bits::UnsignedMod32(m.left().Value(), m.right().Value())); |
| 627 | } |
| 628 | if (m.right().HasValue()) { |
| 629 | Node* const dividend = m.left().node(); |
| 630 | uint32_t const divisor = m.right().Value(); |
| 631 | if (base::bits::IsPowerOfTwo32(divisor)) { // x % 2^n => x & 2^n-1 |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 632 | node->ReplaceInput(1, Uint32Constant(m.right().Value() - 1)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 633 | node->TrimInputCount(2); |
| 634 | NodeProperties::ChangeOp(node, machine()->Word32And()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 635 | } else { |
| 636 | Node* quotient = Uint32Div(dividend, divisor); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 637 | DCHECK_EQ(dividend, node->InputAt(0)); |
| 638 | node->ReplaceInput(1, Int32Mul(quotient, Uint32Constant(divisor))); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 639 | node->TrimInputCount(2); |
| 640 | NodeProperties::ChangeOp(node, machine()->Int32Sub()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 641 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 642 | return Changed(node); |
| 643 | } |
| 644 | return NoChange(); |
| 645 | } |
| 646 | |
| 647 | |
| 648 | Reduction MachineOperatorReducer::ReduceTruncateFloat64ToInt32(Node* node) { |
| 649 | Float64Matcher m(node->InputAt(0)); |
| 650 | if (m.HasValue()) return ReplaceInt32(DoubleToInt32(m.Value())); |
| 651 | if (m.IsChangeInt32ToFloat64()) return Replace(m.node()->InputAt(0)); |
| 652 | if (m.IsPhi()) { |
| 653 | Node* const phi = m.node(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 654 | DCHECK_EQ(MachineRepresentation::kFloat64, PhiRepresentationOf(phi->op())); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 655 | if (phi->OwnedBy(node)) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 656 | // TruncateFloat64ToInt32[mode](Phi[Float64](x1,...,xn)) |
| 657 | // => Phi[Int32](TruncateFloat64ToInt32[mode](x1), |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 658 | // ..., |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 659 | // TruncateFloat64ToInt32[mode](xn)) |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 660 | const int value_input_count = phi->InputCount() - 1; |
| 661 | for (int i = 0; i < value_input_count; ++i) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 662 | Node* input = graph()->NewNode(node->op(), phi->InputAt(i)); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 663 | // TODO(bmeurer): Reschedule input for reduction once we have Revisit() |
| 664 | // instead of recursing into ReduceTruncateFloat64ToInt32() here. |
| 665 | Reduction reduction = ReduceTruncateFloat64ToInt32(input); |
| 666 | if (reduction.Changed()) input = reduction.replacement(); |
| 667 | phi->ReplaceInput(i, input); |
| 668 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 669 | NodeProperties::ChangeOp( |
| 670 | phi, |
| 671 | common()->Phi(MachineRepresentation::kWord32, value_input_count)); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 672 | return Replace(phi); |
| 673 | } |
| 674 | } |
| 675 | return NoChange(); |
| 676 | } |
| 677 | |
| 678 | |
| 679 | Reduction MachineOperatorReducer::ReduceStore(Node* node) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 680 | MachineRepresentation const rep = |
| 681 | StoreRepresentationOf(node->op()).representation(); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 682 | Node* const value = node->InputAt(2); |
| 683 | switch (value->opcode()) { |
| 684 | case IrOpcode::kWord32And: { |
| 685 | Uint32BinopMatcher m(value); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 686 | if (m.right().HasValue() && ((rep == MachineRepresentation::kWord8 && |
| 687 | (m.right().Value() & 0xff) == 0xff) || |
| 688 | (rep == MachineRepresentation::kWord16 && |
| 689 | (m.right().Value() & 0xffff) == 0xffff))) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 690 | node->ReplaceInput(2, m.left().node()); |
| 691 | return Changed(node); |
| 692 | } |
| 693 | break; |
| 694 | } |
| 695 | case IrOpcode::kWord32Sar: { |
| 696 | Int32BinopMatcher m(value); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 697 | if (m.left().IsWord32Shl() && ((rep == MachineRepresentation::kWord8 && |
| 698 | m.right().IsInRange(1, 24)) || |
| 699 | (rep == MachineRepresentation::kWord16 && |
| 700 | m.right().IsInRange(1, 16)))) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 701 | Int32BinopMatcher mleft(m.left().node()); |
| 702 | if (mleft.right().Is(m.right().Value())) { |
| 703 | node->ReplaceInput(2, mleft.left().node()); |
| 704 | return Changed(node); |
| 705 | } |
| 706 | } |
| 707 | break; |
| 708 | } |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 709 | default: |
| 710 | break; |
| 711 | } |
| 712 | return NoChange(); |
| 713 | } |
| 714 | |
| 715 | |
| 716 | Reduction MachineOperatorReducer::ReduceProjection(size_t index, Node* node) { |
| 717 | switch (node->opcode()) { |
| 718 | case IrOpcode::kInt32AddWithOverflow: { |
| 719 | DCHECK(index == 0 || index == 1); |
| 720 | Int32BinopMatcher m(node); |
| 721 | if (m.IsFoldable()) { |
| 722 | int32_t val; |
| 723 | bool ovf = base::bits::SignedAddOverflow32(m.left().Value(), |
| 724 | m.right().Value(), &val); |
| 725 | return ReplaceInt32((index == 0) ? val : ovf); |
| 726 | } |
| 727 | if (m.right().Is(0)) { |
| 728 | return (index == 0) ? Replace(m.left().node()) : ReplaceInt32(0); |
| 729 | } |
| 730 | break; |
| 731 | } |
| 732 | case IrOpcode::kInt32SubWithOverflow: { |
| 733 | DCHECK(index == 0 || index == 1); |
| 734 | Int32BinopMatcher m(node); |
| 735 | if (m.IsFoldable()) { |
| 736 | int32_t val; |
| 737 | bool ovf = base::bits::SignedSubOverflow32(m.left().Value(), |
| 738 | m.right().Value(), &val); |
| 739 | return ReplaceInt32((index == 0) ? val : ovf); |
| 740 | } |
| 741 | if (m.right().Is(0)) { |
| 742 | return (index == 0) ? Replace(m.left().node()) : ReplaceInt32(0); |
| 743 | } |
| 744 | break; |
| 745 | } |
| 746 | default: |
| 747 | break; |
| 748 | } |
| 749 | return NoChange(); |
| 750 | } |
| 751 | |
| 752 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 753 | Reduction MachineOperatorReducer::ReduceWord32Shifts(Node* node) { |
| 754 | DCHECK((node->opcode() == IrOpcode::kWord32Shl) || |
| 755 | (node->opcode() == IrOpcode::kWord32Shr) || |
| 756 | (node->opcode() == IrOpcode::kWord32Sar)); |
| 757 | if (machine()->Word32ShiftIsSafe()) { |
| 758 | // Remove the explicit 'and' with 0x1f if the shift provided by the machine |
| 759 | // instruction matches that required by JavaScript. |
| 760 | Int32BinopMatcher m(node); |
| 761 | if (m.right().IsWord32And()) { |
| 762 | Int32BinopMatcher mright(m.right().node()); |
| 763 | if (mright.right().Is(0x1f)) { |
| 764 | node->ReplaceInput(1, mright.left().node()); |
| 765 | return Changed(node); |
| 766 | } |
| 767 | } |
| 768 | } |
| 769 | return NoChange(); |
| 770 | } |
| 771 | |
| 772 | |
| 773 | Reduction MachineOperatorReducer::ReduceWord32Shl(Node* node) { |
| 774 | DCHECK_EQ(IrOpcode::kWord32Shl, node->opcode()); |
| 775 | Int32BinopMatcher m(node); |
| 776 | if (m.right().Is(0)) return Replace(m.left().node()); // x << 0 => x |
| 777 | if (m.IsFoldable()) { // K << K => K |
| 778 | return ReplaceInt32(m.left().Value() << m.right().Value()); |
| 779 | } |
| 780 | if (m.right().IsInRange(1, 31)) { |
| 781 | // (x >>> K) << K => x & ~(2^K - 1) |
| 782 | // (x >> K) << K => x & ~(2^K - 1) |
| 783 | if (m.left().IsWord32Sar() || m.left().IsWord32Shr()) { |
| 784 | Int32BinopMatcher mleft(m.left().node()); |
| 785 | if (mleft.right().Is(m.right().Value())) { |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 786 | node->ReplaceInput(0, mleft.left().node()); |
| 787 | node->ReplaceInput(1, |
| 788 | Uint32Constant(~((1U << m.right().Value()) - 1U))); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 789 | NodeProperties::ChangeOp(node, machine()->Word32And()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 790 | Reduction reduction = ReduceWord32And(node); |
| 791 | return reduction.Changed() ? reduction : Changed(node); |
| 792 | } |
| 793 | } |
| 794 | } |
| 795 | return ReduceWord32Shifts(node); |
| 796 | } |
| 797 | |
| 798 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 799 | Reduction MachineOperatorReducer::ReduceWord32Sar(Node* node) { |
| 800 | Int32BinopMatcher m(node); |
| 801 | if (m.right().Is(0)) return Replace(m.left().node()); // x >> 0 => x |
| 802 | if (m.IsFoldable()) { // K >> K => K |
| 803 | return ReplaceInt32(m.left().Value() >> m.right().Value()); |
| 804 | } |
| 805 | if (m.left().IsWord32Shl()) { |
| 806 | Int32BinopMatcher mleft(m.left().node()); |
| 807 | if (mleft.left().IsComparison()) { |
| 808 | if (m.right().Is(31) && mleft.right().Is(31)) { |
| 809 | // Comparison << 31 >> 31 => 0 - Comparison |
| 810 | node->ReplaceInput(0, Int32Constant(0)); |
| 811 | node->ReplaceInput(1, mleft.left().node()); |
| 812 | NodeProperties::ChangeOp(node, machine()->Int32Sub()); |
| 813 | Reduction const reduction = ReduceInt32Sub(node); |
| 814 | return reduction.Changed() ? reduction : Changed(node); |
| 815 | } |
| 816 | } else if (mleft.left().IsLoad()) { |
| 817 | LoadRepresentation const rep = |
| 818 | LoadRepresentationOf(mleft.left().node()->op()); |
| 819 | if (m.right().Is(24) && mleft.right().Is(24) && |
| 820 | rep == MachineType::Int8()) { |
| 821 | // Load[kMachInt8] << 24 >> 24 => Load[kMachInt8] |
| 822 | return Replace(mleft.left().node()); |
| 823 | } |
| 824 | if (m.right().Is(16) && mleft.right().Is(16) && |
| 825 | rep == MachineType::Int16()) { |
| 826 | // Load[kMachInt16] << 16 >> 16 => Load[kMachInt8] |
| 827 | return Replace(mleft.left().node()); |
| 828 | } |
| 829 | } |
| 830 | } |
| 831 | return ReduceWord32Shifts(node); |
| 832 | } |
| 833 | |
| 834 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 835 | Reduction MachineOperatorReducer::ReduceWord32And(Node* node) { |
| 836 | DCHECK_EQ(IrOpcode::kWord32And, node->opcode()); |
| 837 | Int32BinopMatcher m(node); |
| 838 | if (m.right().Is(0)) return Replace(m.right().node()); // x & 0 => 0 |
| 839 | if (m.right().Is(-1)) return Replace(m.left().node()); // x & -1 => x |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 840 | if (m.left().IsComparison() && m.right().Is(1)) { // CMP & 1 => CMP |
| 841 | return Replace(m.left().node()); |
| 842 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 843 | if (m.IsFoldable()) { // K & K => K |
| 844 | return ReplaceInt32(m.left().Value() & m.right().Value()); |
| 845 | } |
| 846 | if (m.LeftEqualsRight()) return Replace(m.left().node()); // x & x => x |
| 847 | if (m.left().IsWord32And() && m.right().HasValue()) { |
| 848 | Int32BinopMatcher mleft(m.left().node()); |
| 849 | if (mleft.right().HasValue()) { // (x & K) & K => x & K |
| 850 | node->ReplaceInput(0, mleft.left().node()); |
| 851 | node->ReplaceInput( |
| 852 | 1, Int32Constant(m.right().Value() & mleft.right().Value())); |
| 853 | Reduction const reduction = ReduceWord32And(node); |
| 854 | return reduction.Changed() ? reduction : Changed(node); |
| 855 | } |
| 856 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 857 | if (m.right().IsNegativePowerOf2()) { |
| 858 | int32_t const mask = m.right().Value(); |
| 859 | if (m.left().IsWord32Shl()) { |
| 860 | Uint32BinopMatcher mleft(m.left().node()); |
| 861 | if (mleft.right().HasValue() && |
| 862 | mleft.right().Value() >= base::bits::CountTrailingZeros32(mask)) { |
| 863 | // (x << L) & (-1 << K) => x << L iff K >= L |
| 864 | return Replace(mleft.node()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 865 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 866 | } else if (m.left().IsInt32Add()) { |
| 867 | Int32BinopMatcher mleft(m.left().node()); |
| 868 | if (mleft.right().HasValue() && |
| 869 | (mleft.right().Value() & mask) == mleft.right().Value()) { |
| 870 | // (x + (K << L)) & (-1 << L) => (x & (-1 << L)) + (K << L) |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 871 | node->ReplaceInput(0, Word32And(mleft.left().node(), m.right().node())); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 872 | node->ReplaceInput(1, mleft.right().node()); |
| 873 | NodeProperties::ChangeOp(node, machine()->Int32Add()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 874 | Reduction const reduction = ReduceInt32Add(node); |
| 875 | return reduction.Changed() ? reduction : Changed(node); |
| 876 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 877 | if (mleft.left().IsInt32Mul()) { |
| 878 | Int32BinopMatcher mleftleft(mleft.left().node()); |
| 879 | if (mleftleft.right().IsMultipleOf(-mask)) { |
| 880 | // (y * (K << L) + x) & (-1 << L) => (x & (-1 << L)) + y * (K << L) |
| 881 | node->ReplaceInput(0, |
| 882 | Word32And(mleft.right().node(), m.right().node())); |
| 883 | node->ReplaceInput(1, mleftleft.node()); |
| 884 | NodeProperties::ChangeOp(node, machine()->Int32Add()); |
| 885 | Reduction const reduction = ReduceInt32Add(node); |
| 886 | return reduction.Changed() ? reduction : Changed(node); |
| 887 | } |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 888 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 889 | if (mleft.right().IsInt32Mul()) { |
| 890 | Int32BinopMatcher mleftright(mleft.right().node()); |
| 891 | if (mleftright.right().IsMultipleOf(-mask)) { |
| 892 | // (x + y * (K << L)) & (-1 << L) => (x & (-1 << L)) + y * (K << L) |
| 893 | node->ReplaceInput(0, |
| 894 | Word32And(mleft.left().node(), m.right().node())); |
| 895 | node->ReplaceInput(1, mleftright.node()); |
| 896 | NodeProperties::ChangeOp(node, machine()->Int32Add()); |
| 897 | Reduction const reduction = ReduceInt32Add(node); |
| 898 | return reduction.Changed() ? reduction : Changed(node); |
| 899 | } |
| 900 | } |
| 901 | if (mleft.left().IsWord32Shl()) { |
| 902 | Int32BinopMatcher mleftleft(mleft.left().node()); |
| 903 | if (mleftleft.right().Is(base::bits::CountTrailingZeros32(mask))) { |
| 904 | // (y << L + x) & (-1 << L) => (x & (-1 << L)) + y << L |
| 905 | node->ReplaceInput(0, |
| 906 | Word32And(mleft.right().node(), m.right().node())); |
| 907 | node->ReplaceInput(1, mleftleft.node()); |
| 908 | NodeProperties::ChangeOp(node, machine()->Int32Add()); |
| 909 | Reduction const reduction = ReduceInt32Add(node); |
| 910 | return reduction.Changed() ? reduction : Changed(node); |
| 911 | } |
| 912 | } |
| 913 | if (mleft.right().IsWord32Shl()) { |
| 914 | Int32BinopMatcher mleftright(mleft.right().node()); |
| 915 | if (mleftright.right().Is(base::bits::CountTrailingZeros32(mask))) { |
| 916 | // (x + y << L) & (-1 << L) => (x & (-1 << L)) + y << L |
| 917 | node->ReplaceInput(0, |
| 918 | Word32And(mleft.left().node(), m.right().node())); |
| 919 | node->ReplaceInput(1, mleftright.node()); |
| 920 | NodeProperties::ChangeOp(node, machine()->Int32Add()); |
| 921 | Reduction const reduction = ReduceInt32Add(node); |
| 922 | return reduction.Changed() ? reduction : Changed(node); |
| 923 | } |
| 924 | } |
| 925 | } else if (m.left().IsInt32Mul()) { |
| 926 | Int32BinopMatcher mleft(m.left().node()); |
| 927 | if (mleft.right().IsMultipleOf(-mask)) { |
| 928 | // (x * (K << L)) & (-1 << L) => x * (K << L) |
| 929 | return Replace(mleft.node()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 930 | } |
| 931 | } |
| 932 | } |
| 933 | return NoChange(); |
| 934 | } |
| 935 | |
| 936 | |
| 937 | Reduction MachineOperatorReducer::ReduceWord32Or(Node* node) { |
| 938 | DCHECK_EQ(IrOpcode::kWord32Or, node->opcode()); |
| 939 | Int32BinopMatcher m(node); |
| 940 | if (m.right().Is(0)) return Replace(m.left().node()); // x | 0 => x |
| 941 | if (m.right().Is(-1)) return Replace(m.right().node()); // x | -1 => -1 |
| 942 | if (m.IsFoldable()) { // K | K => K |
| 943 | return ReplaceInt32(m.left().Value() | m.right().Value()); |
| 944 | } |
| 945 | if (m.LeftEqualsRight()) return Replace(m.left().node()); // x | x => x |
| 946 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 947 | Node* shl = nullptr; |
| 948 | Node* shr = nullptr; |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 949 | // Recognize rotation, we are matching either: |
| 950 | // * x << y | x >>> (32 - y) => x ror (32 - y), i.e x rol y |
| 951 | // * x << (32 - y) | x >>> y => x ror y |
| 952 | // as well as their commuted form. |
| 953 | if (m.left().IsWord32Shl() && m.right().IsWord32Shr()) { |
| 954 | shl = m.left().node(); |
| 955 | shr = m.right().node(); |
| 956 | } else if (m.left().IsWord32Shr() && m.right().IsWord32Shl()) { |
| 957 | shl = m.right().node(); |
| 958 | shr = m.left().node(); |
| 959 | } else { |
| 960 | return NoChange(); |
| 961 | } |
| 962 | |
| 963 | Int32BinopMatcher mshl(shl); |
| 964 | Int32BinopMatcher mshr(shr); |
| 965 | if (mshl.left().node() != mshr.left().node()) return NoChange(); |
| 966 | |
| 967 | if (mshl.right().HasValue() && mshr.right().HasValue()) { |
| 968 | // Case where y is a constant. |
| 969 | if (mshl.right().Value() + mshr.right().Value() != 32) return NoChange(); |
| 970 | } else { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 971 | Node* sub = nullptr; |
| 972 | Node* y = nullptr; |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 973 | if (mshl.right().IsInt32Sub()) { |
| 974 | sub = mshl.right().node(); |
| 975 | y = mshr.right().node(); |
| 976 | } else if (mshr.right().IsInt32Sub()) { |
| 977 | sub = mshr.right().node(); |
| 978 | y = mshl.right().node(); |
| 979 | } else { |
| 980 | return NoChange(); |
| 981 | } |
| 982 | |
| 983 | Int32BinopMatcher msub(sub); |
| 984 | if (!msub.left().Is(32) || msub.right().node() != y) return NoChange(); |
| 985 | } |
| 986 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 987 | node->ReplaceInput(0, mshl.left().node()); |
| 988 | node->ReplaceInput(1, mshr.right().node()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 989 | NodeProperties::ChangeOp(node, machine()->Word32Ror()); |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 990 | return Changed(node); |
| 991 | } |
| 992 | |
| 993 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 994 | Reduction MachineOperatorReducer::ReduceFloat64InsertLowWord32(Node* node) { |
| 995 | DCHECK_EQ(IrOpcode::kFloat64InsertLowWord32, node->opcode()); |
| 996 | Float64Matcher mlhs(node->InputAt(0)); |
| 997 | Uint32Matcher mrhs(node->InputAt(1)); |
| 998 | if (mlhs.HasValue() && mrhs.HasValue()) { |
| 999 | return ReplaceFloat64(bit_cast<double>( |
| 1000 | (bit_cast<uint64_t>(mlhs.Value()) & V8_UINT64_C(0xFFFFFFFF00000000)) | |
| 1001 | mrhs.Value())); |
| 1002 | } |
| 1003 | return NoChange(); |
| 1004 | } |
| 1005 | |
| 1006 | |
| 1007 | Reduction MachineOperatorReducer::ReduceFloat64InsertHighWord32(Node* node) { |
| 1008 | DCHECK_EQ(IrOpcode::kFloat64InsertHighWord32, node->opcode()); |
| 1009 | Float64Matcher mlhs(node->InputAt(0)); |
| 1010 | Uint32Matcher mrhs(node->InputAt(1)); |
| 1011 | if (mlhs.HasValue() && mrhs.HasValue()) { |
| 1012 | return ReplaceFloat64(bit_cast<double>( |
| 1013 | (bit_cast<uint64_t>(mlhs.Value()) & V8_UINT64_C(0xFFFFFFFF)) | |
| 1014 | (static_cast<uint64_t>(mrhs.Value()) << 32))); |
| 1015 | } |
| 1016 | return NoChange(); |
| 1017 | } |
| 1018 | |
| 1019 | |
| 1020 | namespace { |
| 1021 | |
| 1022 | bool IsFloat64RepresentableAsFloat32(const Float64Matcher& m) { |
| 1023 | if (m.HasValue()) { |
| 1024 | double v = m.Value(); |
| 1025 | float fv = static_cast<float>(v); |
| 1026 | return static_cast<double>(fv) == v; |
| 1027 | } |
| 1028 | return false; |
| 1029 | } |
| 1030 | |
| 1031 | } // namespace |
| 1032 | |
| 1033 | |
| 1034 | Reduction MachineOperatorReducer::ReduceFloat64Compare(Node* node) { |
| 1035 | DCHECK((IrOpcode::kFloat64Equal == node->opcode()) || |
| 1036 | (IrOpcode::kFloat64LessThan == node->opcode()) || |
| 1037 | (IrOpcode::kFloat64LessThanOrEqual == node->opcode())); |
| 1038 | // As all Float32 values have an exact representation in Float64, comparing |
| 1039 | // two Float64 values both converted from Float32 is equivalent to comparing |
| 1040 | // the original Float32s, so we can ignore the conversions. We can also reduce |
| 1041 | // comparisons of converted Float64 values against constants that can be |
| 1042 | // represented exactly as Float32. |
| 1043 | Float64BinopMatcher m(node); |
| 1044 | if ((m.left().IsChangeFloat32ToFloat64() && |
| 1045 | m.right().IsChangeFloat32ToFloat64()) || |
| 1046 | (m.left().IsChangeFloat32ToFloat64() && |
| 1047 | IsFloat64RepresentableAsFloat32(m.right())) || |
| 1048 | (IsFloat64RepresentableAsFloat32(m.left()) && |
| 1049 | m.right().IsChangeFloat32ToFloat64())) { |
| 1050 | switch (node->opcode()) { |
| 1051 | case IrOpcode::kFloat64Equal: |
| 1052 | NodeProperties::ChangeOp(node, machine()->Float32Equal()); |
| 1053 | break; |
| 1054 | case IrOpcode::kFloat64LessThan: |
| 1055 | NodeProperties::ChangeOp(node, machine()->Float32LessThan()); |
| 1056 | break; |
| 1057 | case IrOpcode::kFloat64LessThanOrEqual: |
| 1058 | NodeProperties::ChangeOp(node, machine()->Float32LessThanOrEqual()); |
| 1059 | break; |
| 1060 | default: |
| 1061 | return NoChange(); |
| 1062 | } |
| 1063 | node->ReplaceInput( |
| 1064 | 0, m.left().HasValue() |
| 1065 | ? Float32Constant(static_cast<float>(m.left().Value())) |
| 1066 | : m.left().InputAt(0)); |
| 1067 | node->ReplaceInput( |
| 1068 | 1, m.right().HasValue() |
| 1069 | ? Float32Constant(static_cast<float>(m.right().Value())) |
| 1070 | : m.right().InputAt(0)); |
| 1071 | return Changed(node); |
| 1072 | } |
| 1073 | return NoChange(); |
| 1074 | } |
| 1075 | |
| 1076 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1077 | CommonOperatorBuilder* MachineOperatorReducer::common() const { |
| 1078 | return jsgraph()->common(); |
| 1079 | } |
| 1080 | |
| 1081 | |
| 1082 | MachineOperatorBuilder* MachineOperatorReducer::machine() const { |
| 1083 | return jsgraph()->machine(); |
| 1084 | } |
| 1085 | |
| 1086 | |
| 1087 | Graph* MachineOperatorReducer::graph() const { return jsgraph()->graph(); } |
| 1088 | |
| 1089 | } // namespace compiler |
| 1090 | } // namespace internal |
| 1091 | } // namespace v8 |