Implement Math.random() purely in JavaScript.

src/arm/lithium-codegen-arm.cc

 // Copyright 2012 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 3889 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 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;
-  __ ldr(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;
-  __ ldr(state, FieldMemOperand(native_context, kRandomSeedOffset));
-
-  // Load state[0].
-  Register state0 = ToRegister(instr->scratch());
-  __ ldr(state0, FieldMemOperand(state, ByteArray::kHeaderSize));
-  // Load state[1].
-  Register state1 = ToRegister(instr->scratch2());
-  __ ldr(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));
-  __ mov(scratch4, Operand(18273));
-  __ mul(scratch3, scratch3, scratch4);
-  __ add(state0, scratch3, Operand(state0, LSR, 16));
-  // Save state[0].
-  __ str(state0, FieldMemOperand(state, ByteArray::kHeaderSize));
-
-  // state[1] = 36969 * (state[1] & 0xFFFF) + (state[1] >> 16)
-  __ and_(scratch3, state1, Operand(0xFFFF));
-  __ mov(scratch4, Operand(36969));
-  __ mul(scratch3, scratch3, scratch4);
-  __ add(state1, scratch3, Operand(state1, LSR, 16));
-  // Save state[1].
-  __ str(state1, FieldMemOperand(state, ByteArray::kHeaderSize + kSeedSize));
-
-  // Random bit pattern = (state[0] << 14) + (state[1] & 0x3FFFF)
-  Register random = scratch4;
-  __ and_(random, state1, Operand(0x3FFFF));
-  __ add(random, random, Operand(state0, LSL, 14));
-
-  // 0x41300000 is the top half of 1.0 x 2^20 as a double.
-  // Create this constant using mov/orr to avoid PC relative load.
-  __ mov(scratch3, Operand(0x41000000));
-  __ orr(scratch3, scratch3, Operand(0x300000));
-  // Move 0x41300000xxxxxxxx (x = random bits) to VFP.
-  DwVfpRegister result = ToDoubleRegister(instr->result());
-  __ vmov(result, random, scratch3);
-  // Move 0x4130000000000000 to VFP.
-  __ mov(scratch4, Operand::Zero());
-  DwVfpRegister scratch5 = double_scratch0();
-  __ vmov(scratch5, scratch4, scratch3);
-  __ vsub(result, result, scratch5);
-}
-
-
 void LCodeGen::DoMathExp(LMathExp* instr) {
   DwVfpRegister input = ToDoubleRegister(instr->value());
   DwVfpRegister result = ToDoubleRegister(instr->result());
   DwVfpRegister double_scratch1 = ToDoubleRegister(instr->double_temp());
   DwVfpRegister double_scratch2 = double_scratch0();
   Register temp1 = ToRegister(instr->temp1());
   Register temp2 = ToRegister(instr->temp2());
 
   MathExpGenerator::EmitMathExp(
       masm(), input, result, double_scratch1, double_scratch2,
@@ skipping 1893 matching lines @@
   __ sub(scratch, result, Operand::PointerOffsetFromSmiKey(index));
   __ ldr(result, FieldMemOperand(scratch,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal