Implement Math.random() purely in JavaScript.

src/x64/lithium-codegen-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3713 matching lines @@
     MathPowStub stub(MathPowStub::INTEGER);
     __ CallStub(&stub);
   } else {
     ASSERT(exponent_type.IsDouble());
     MathPowStub stub(MathPowStub::DOUBLE);
     __ CallStub(&stub);
   }
 }
 
 
-void LCodeGen::DoRandom(LRandom* instr) {
-  // Assert that register size is twice the size of each seed.
-  static const int kSeedSize = sizeof(uint32_t);
-  STATIC_ASSERT(kPointerSize == 2 * kSeedSize);
-
-  // Load native context
-  Register global_object = ToRegister(instr->global_object());
-  Register native_context = global_object;
-  __ movq(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;
-  __ movq(state, FieldOperand(native_context, kRandomSeedOffset));
-
-  // Load state[0].
-  Register state0 = ToRegister(instr->scratch());
-  __ movl(state0, FieldOperand(state, ByteArray::kHeaderSize));
-  // Load state[1].
-  Register state1 = ToRegister(instr->scratch2());
-  __ movl(state1, FieldOperand(state, ByteArray::kHeaderSize + kSeedSize));
-
-  // state[0] = 18273 * (state[0] & 0xFFFF) + (state[0] >> 16)
-  Register scratch3 = ToRegister(instr->scratch3());
-  __ movzxwl(scratch3, state0);
-  __ imull(scratch3, scratch3, Immediate(18273));
-  __ shrl(state0, Immediate(16));
-  __ addl(state0, scratch3);
-  // Save state[0].
-  __ movl(FieldOperand(state, ByteArray::kHeaderSize), state0);
-
-  // state[1] = 36969 * (state[1] & 0xFFFF) + (state[1] >> 16)
-  __ movzxwl(scratch3, state1);
-  __ imull(scratch3, scratch3, Immediate(36969));
-  __ shrl(state1, Immediate(16));
-  __ addl(state1, scratch3);
-  // Save state[1].
-  __ movl(FieldOperand(state, ByteArray::kHeaderSize + kSeedSize), state1);
-
-  // Random bit pattern = (state[0] << 14) + (state[1] & 0x3FFFF)
-  Register random = state0;
-  __ shll(random, Immediate(14));
-  __ andl(state1, Immediate(0x3FFFF));
-  __ addl(random, state1);
-
-  // Convert 32 random bits in rax 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();
-  __ movq(scratch3, V8_INT64_C(0x4130000000000000));  // 1.0 x 2^20 as double
-  __ movq(scratch4, scratch3);
-  __ movd(result, random);
-  __ xorps(result, scratch4);
-  __ subsd(result, scratch4);
-}
-
-
 void LCodeGen::DoMathExp(LMathExp* instr) {
   XMMRegister input = ToDoubleRegister(instr->value());
   XMMRegister result = ToDoubleRegister(instr->result());
   XMMRegister temp0 = double_scratch0();
   Register temp1 = ToRegister(instr->temp1());
   Register temp2 = ToRegister(instr->temp2());
 
   MathExpGenerator::EmitMathExp(masm(), input, result, temp0, temp1, temp2);
 }
 
@@ skipping 1888 matching lines @@
                                FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64