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Unified Diff: src/mips/lithium-codegen-mips.cc

Issue 82763005: Reland "Implement Math.random() purely in JavaScript" plus fixes. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Added assertion Created 7 years, 1 month ago
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Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index 6cb8859317176f584e34064d5cf203469c7570ec..af562624c0bd8226cc3da5230e7483003c3ca9bd 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -3873,68 +3873,6 @@ void LCodeGen::DoPower(LPower* instr) {
}
-void LCodeGen::DoRandom(LRandom* instr) {
- // Assert that the register size is indeed the size of each seed.
- static const int kSeedSize = sizeof(uint32_t);
- STATIC_ASSERT(kPointerSize == kSeedSize);
-
- // Load native context.
- Register global_object = ToRegister(instr->global_object());
- Register native_context = global_object;
- __ lw(native_context, FieldMemOperand(
- global_object, GlobalObject::kNativeContextOffset));
-
- // Load state (FixedArray of the native context's random seeds).
- static const int kRandomSeedOffset =
- FixedArray::kHeaderSize + Context::RANDOM_SEED_INDEX * kPointerSize;
- Register state = native_context;
- __ lw(state, FieldMemOperand(native_context, kRandomSeedOffset));
-
- // Load state[0].
- Register state0 = ToRegister(instr->scratch());
- __ lw(state0, FieldMemOperand(state, ByteArray::kHeaderSize));
- // Load state[1].
- Register state1 = ToRegister(instr->scratch2());
- __ lw(state1, FieldMemOperand(state, ByteArray::kHeaderSize + kSeedSize));
-
- // state[0] = 18273 * (state[0] & 0xFFFF) + (state[0] >> 16)
- Register scratch3 = ToRegister(instr->scratch3());
- Register scratch4 = scratch0();
- __ And(scratch3, state0, Operand(0xFFFF));
- __ li(scratch4, Operand(18273));
- __ Mul(scratch3, scratch3, scratch4);
- __ srl(state0, state0, 16);
- __ Addu(state0, scratch3, state0);
- // Save state[0].
- __ sw(state0, FieldMemOperand(state, ByteArray::kHeaderSize));
-
- // state[1] = 36969 * (state[1] & 0xFFFF) + (state[1] >> 16)
- __ And(scratch3, state1, Operand(0xFFFF));
- __ li(scratch4, Operand(36969));
- __ Mul(scratch3, scratch3, scratch4);
- __ srl(state1, state1, 16),
- __ Addu(state1, scratch3, state1);
- // Save state[1].
- __ sw(state1, FieldMemOperand(state, ByteArray::kHeaderSize + kSeedSize));
-
- // Random bit pattern = (state[0] << 14) + (state[1] & 0x3FFFF)
- Register random = scratch4;
- __ And(random, state1, Operand(0x3FFFF));
- __ sll(state0, state0, 14);
- __ Addu(random, random, state0);
-
- // 0x41300000 is the top half of 1.0 x 2^20 as a double.
- __ li(scratch3, Operand(0x41300000));
- // Move 0x41300000xxxxxxxx (x = random bits in v0) to FPU.
- DoubleRegister result = ToDoubleRegister(instr->result());
- __ Move(result, random, scratch3);
- // Move 0x4130000000000000 to FPU.
- DoubleRegister scratch5 = double_scratch0();
- __ Move(scratch5, zero_reg, scratch3);
- __ sub_d(result, result, scratch5);
-}
-
-
void LCodeGen::DoMathExp(LMathExp* instr) {
DoubleRegister input = ToDoubleRegister(instr->value());
DoubleRegister result = ToDoubleRegister(instr->result());
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