Implement Math.random() purely in JavaScript.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index fd70b7717bb493d50b1d19b8befe23a6ca156f82..fe7dc5495c72162ccde2f3d4b32bccf251a302b1 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -4200,69 +4200,6 @@ void LCodeGen::DoPower(LPower* instr) {
 }
 
 
-void LCodeGen::DoRandom(LRandom* instr) {
-  CpuFeatureScope scope(masm(), SSE2);
-
-  // 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;
-  __ mov(native_context, FieldOperand(
-          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;
-  __ mov(state, FieldOperand(native_context, kRandomSeedOffset));
-
-  // Load state[0].
-  Register state0 = ToRegister(instr->scratch());
-  __ mov(state0, FieldOperand(state, ByteArray::kHeaderSize));
-  // Load state[1].
-  Register state1 = ToRegister(instr->scratch2());
-  __ mov(state1, FieldOperand(state, ByteArray::kHeaderSize + kSeedSize));
-
-  // state[0] = 18273 * (state[0] & 0xFFFF) + (state[0] >> 16)
-  Register scratch3 = ToRegister(instr->scratch3());
-  __ movzx_w(scratch3, state0);
-  __ imul(scratch3, scratch3, 18273);
-  __ shr(state0, 16);
-  __ add(state0, scratch3);
-  // Save state[0].
-  __ mov(FieldOperand(state, ByteArray::kHeaderSize), state0);
-
-  // state[1] = 36969 * (state[1] & 0xFFFF) + (state[1] >> 16)
-  __ movzx_w(scratch3, state1);
-  __ imul(scratch3, scratch3, 36969);
-  __ shr(state1, 16);
-  __ add(state1, scratch3);
-  // Save state[1].
-  __ mov(FieldOperand(state, ByteArray::kHeaderSize + kSeedSize), state1);
-
-  // Random bit pattern = (state[0] << 14) + (state[1] & 0x3FFFF)
-  Register random = state0;
-  __ shl(random, 14);
-  __ and_(state1, Immediate(0x3FFFF));
-  __ add(random, state1);
-
-  // Convert 32 random bits in random to 0.(32 random bits) in a double
-  // by computing:
-  // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)).
-  XMMRegister result = ToDoubleRegister(instr->result());
-  XMMRegister scratch4 = double_scratch0();
-  __ mov(scratch3, Immediate(0x49800000));  // 1.0 x 2^20 as single.
-  __ movd(scratch4, scratch3);
-  __ movd(result, random);
-  __ cvtss2sd(scratch4, scratch4);
-  __ xorps(result, scratch4);
-  __ subsd(result, scratch4);
-}
-
-
 void LCodeGen::DoMathLog(LMathLog* instr) {
   CpuFeatureScope scope(masm(), SSE2);
   ASSERT(instr->value()->Equals(instr->result()));