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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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3844 MathPowStub stub(MathPowStub::INTEGER); | 3844 MathPowStub stub(MathPowStub::INTEGER); |
3845 __ CallStub(&stub); | 3845 __ CallStub(&stub); |
3846 } else { | 3846 } else { |
3847 ASSERT(exponent_type.IsDouble()); | 3847 ASSERT(exponent_type.IsDouble()); |
3848 MathPowStub stub(MathPowStub::DOUBLE); | 3848 MathPowStub stub(MathPowStub::DOUBLE); |
3849 __ CallStub(&stub); | 3849 __ CallStub(&stub); |
3850 } | 3850 } |
3851 } | 3851 } |
3852 | 3852 |
3853 | 3853 |
| 3854 void LCodeGen::DoRandom(LRandom* instr) { |
| 3855 // Assert that the register size is indeed the size of each seed. |
| 3856 static const int kSeedSize = sizeof(uint32_t); |
| 3857 STATIC_ASSERT(kPointerSize == kSeedSize); |
| 3858 |
| 3859 // Load native context. |
| 3860 Register global_object = ToRegister(instr->global_object()); |
| 3861 Register native_context = global_object; |
| 3862 __ lw(native_context, FieldMemOperand( |
| 3863 global_object, GlobalObject::kNativeContextOffset)); |
| 3864 |
| 3865 // Load state (FixedArray of the native context's random seeds). |
| 3866 static const int kRandomSeedOffset = |
| 3867 FixedArray::kHeaderSize + Context::RANDOM_SEED_INDEX * kPointerSize; |
| 3868 Register state = native_context; |
| 3869 __ lw(state, FieldMemOperand(native_context, kRandomSeedOffset)); |
| 3870 |
| 3871 // Load state[0]. |
| 3872 Register state0 = ToRegister(instr->scratch()); |
| 3873 __ lw(state0, FieldMemOperand(state, ByteArray::kHeaderSize)); |
| 3874 // Load state[1]. |
| 3875 Register state1 = ToRegister(instr->scratch2()); |
| 3876 __ lw(state1, FieldMemOperand(state, ByteArray::kHeaderSize + kSeedSize)); |
| 3877 |
| 3878 // state[0] = 18273 * (state[0] & 0xFFFF) + (state[0] >> 16) |
| 3879 Register scratch3 = ToRegister(instr->scratch3()); |
| 3880 Register scratch4 = scratch0(); |
| 3881 __ And(scratch3, state0, Operand(0xFFFF)); |
| 3882 __ li(scratch4, Operand(18273)); |
| 3883 __ Mul(scratch3, scratch3, scratch4); |
| 3884 __ srl(state0, state0, 16); |
| 3885 __ Addu(state0, scratch3, state0); |
| 3886 // Save state[0]. |
| 3887 __ sw(state0, FieldMemOperand(state, ByteArray::kHeaderSize)); |
| 3888 |
| 3889 // state[1] = 36969 * (state[1] & 0xFFFF) + (state[1] >> 16) |
| 3890 __ And(scratch3, state1, Operand(0xFFFF)); |
| 3891 __ li(scratch4, Operand(36969)); |
| 3892 __ Mul(scratch3, scratch3, scratch4); |
| 3893 __ srl(state1, state1, 16), |
| 3894 __ Addu(state1, scratch3, state1); |
| 3895 // Save state[1]. |
| 3896 __ sw(state1, FieldMemOperand(state, ByteArray::kHeaderSize + kSeedSize)); |
| 3897 |
| 3898 // Random bit pattern = (state[0] << 14) + (state[1] & 0x3FFFF) |
| 3899 Register random = scratch4; |
| 3900 __ And(random, state1, Operand(0x3FFFF)); |
| 3901 __ sll(state0, state0, 14); |
| 3902 __ Addu(random, random, state0); |
| 3903 |
| 3904 // 0x41300000 is the top half of 1.0 x 2^20 as a double. |
| 3905 __ li(scratch3, Operand(0x41300000)); |
| 3906 // Move 0x41300000xxxxxxxx (x = random bits in v0) to FPU. |
| 3907 DoubleRegister result = ToDoubleRegister(instr->result()); |
| 3908 __ Move(result, random, scratch3); |
| 3909 // Move 0x4130000000000000 to FPU. |
| 3910 DoubleRegister scratch5 = double_scratch0(); |
| 3911 __ Move(scratch5, zero_reg, scratch3); |
| 3912 __ sub_d(result, result, scratch5); |
| 3913 } |
| 3914 |
| 3915 |
3854 void LCodeGen::DoMathExp(LMathExp* instr) { | 3916 void LCodeGen::DoMathExp(LMathExp* instr) { |
3855 DoubleRegister input = ToDoubleRegister(instr->value()); | 3917 DoubleRegister input = ToDoubleRegister(instr->value()); |
3856 DoubleRegister result = ToDoubleRegister(instr->result()); | 3918 DoubleRegister result = ToDoubleRegister(instr->result()); |
3857 DoubleRegister double_scratch1 = ToDoubleRegister(instr->double_temp()); | 3919 DoubleRegister double_scratch1 = ToDoubleRegister(instr->double_temp()); |
3858 DoubleRegister double_scratch2 = double_scratch0(); | 3920 DoubleRegister double_scratch2 = double_scratch0(); |
3859 Register temp1 = ToRegister(instr->temp1()); | 3921 Register temp1 = ToRegister(instr->temp1()); |
3860 Register temp2 = ToRegister(instr->temp2()); | 3922 Register temp2 = ToRegister(instr->temp2()); |
3861 | 3923 |
3862 MathExpGenerator::EmitMathExp( | 3924 MathExpGenerator::EmitMathExp( |
3863 masm(), input, result, double_scratch1, double_scratch2, | 3925 masm(), input, result, double_scratch1, double_scratch2, |
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5845 __ Subu(scratch, result, scratch); | 5907 __ Subu(scratch, result, scratch); |
5846 __ lw(result, FieldMemOperand(scratch, | 5908 __ lw(result, FieldMemOperand(scratch, |
5847 FixedArray::kHeaderSize - kPointerSize)); | 5909 FixedArray::kHeaderSize - kPointerSize)); |
5848 __ bind(&done); | 5910 __ bind(&done); |
5849 } | 5911 } |
5850 | 5912 |
5851 | 5913 |
5852 #undef __ | 5914 #undef __ |
5853 | 5915 |
5854 } } // namespace v8::internal | 5916 } } // namespace v8::internal |
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