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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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3927 MathPowStub stub(MathPowStub::INTEGER); | 3927 MathPowStub stub(MathPowStub::INTEGER); |
3928 __ CallStub(&stub); | 3928 __ CallStub(&stub); |
3929 } else { | 3929 } else { |
3930 ASSERT(exponent_type.IsDouble()); | 3930 ASSERT(exponent_type.IsDouble()); |
3931 MathPowStub stub(MathPowStub::DOUBLE); | 3931 MathPowStub stub(MathPowStub::DOUBLE); |
3932 __ CallStub(&stub); | 3932 __ CallStub(&stub); |
3933 } | 3933 } |
3934 } | 3934 } |
3935 | 3935 |
3936 | 3936 |
| 3937 void LCodeGen::DoRandom(LRandom* instr) { |
| 3938 // Assert that the register size is indeed the size of each seed. |
| 3939 static const int kSeedSize = sizeof(uint32_t); |
| 3940 STATIC_ASSERT(kPointerSize == kSeedSize); |
| 3941 |
| 3942 // Load native context |
| 3943 Register global_object = ToRegister(instr->global_object()); |
| 3944 Register native_context = global_object; |
| 3945 __ ldr(native_context, FieldMemOperand( |
| 3946 global_object, GlobalObject::kNativeContextOffset)); |
| 3947 |
| 3948 // Load state (FixedArray of the native context's random seeds) |
| 3949 static const int kRandomSeedOffset = |
| 3950 FixedArray::kHeaderSize + Context::RANDOM_SEED_INDEX * kPointerSize; |
| 3951 Register state = native_context; |
| 3952 __ ldr(state, FieldMemOperand(native_context, kRandomSeedOffset)); |
| 3953 |
| 3954 // Load state[0]. |
| 3955 Register state0 = ToRegister(instr->scratch()); |
| 3956 __ ldr(state0, FieldMemOperand(state, ByteArray::kHeaderSize)); |
| 3957 // Load state[1]. |
| 3958 Register state1 = ToRegister(instr->scratch2()); |
| 3959 __ ldr(state1, FieldMemOperand(state, ByteArray::kHeaderSize + kSeedSize)); |
| 3960 |
| 3961 // state[0] = 18273 * (state[0] & 0xFFFF) + (state[0] >> 16) |
| 3962 Register scratch3 = ToRegister(instr->scratch3()); |
| 3963 Register scratch4 = scratch0(); |
| 3964 __ and_(scratch3, state0, Operand(0xFFFF)); |
| 3965 __ mov(scratch4, Operand(18273)); |
| 3966 __ mul(scratch3, scratch3, scratch4); |
| 3967 __ add(state0, scratch3, Operand(state0, LSR, 16)); |
| 3968 // Save state[0]. |
| 3969 __ str(state0, FieldMemOperand(state, ByteArray::kHeaderSize)); |
| 3970 |
| 3971 // state[1] = 36969 * (state[1] & 0xFFFF) + (state[1] >> 16) |
| 3972 __ and_(scratch3, state1, Operand(0xFFFF)); |
| 3973 __ mov(scratch4, Operand(36969)); |
| 3974 __ mul(scratch3, scratch3, scratch4); |
| 3975 __ add(state1, scratch3, Operand(state1, LSR, 16)); |
| 3976 // Save state[1]. |
| 3977 __ str(state1, FieldMemOperand(state, ByteArray::kHeaderSize + kSeedSize)); |
| 3978 |
| 3979 // Random bit pattern = (state[0] << 14) + (state[1] & 0x3FFFF) |
| 3980 Register random = scratch4; |
| 3981 __ and_(random, state1, Operand(0x3FFFF)); |
| 3982 __ add(random, random, Operand(state0, LSL, 14)); |
| 3983 |
| 3984 // 0x41300000 is the top half of 1.0 x 2^20 as a double. |
| 3985 // Create this constant using mov/orr to avoid PC relative load. |
| 3986 __ mov(scratch3, Operand(0x41000000)); |
| 3987 __ orr(scratch3, scratch3, Operand(0x300000)); |
| 3988 // Move 0x41300000xxxxxxxx (x = random bits) to VFP. |
| 3989 DwVfpRegister result = ToDoubleRegister(instr->result()); |
| 3990 __ vmov(result, random, scratch3); |
| 3991 // Move 0x4130000000000000 to VFP. |
| 3992 __ mov(scratch4, Operand::Zero()); |
| 3993 DwVfpRegister scratch5 = double_scratch0(); |
| 3994 __ vmov(scratch5, scratch4, scratch3); |
| 3995 __ vsub(result, result, scratch5); |
| 3996 } |
| 3997 |
| 3998 |
3937 void LCodeGen::DoMathExp(LMathExp* instr) { | 3999 void LCodeGen::DoMathExp(LMathExp* instr) { |
3938 DwVfpRegister input = ToDoubleRegister(instr->value()); | 4000 DwVfpRegister input = ToDoubleRegister(instr->value()); |
3939 DwVfpRegister result = ToDoubleRegister(instr->result()); | 4001 DwVfpRegister result = ToDoubleRegister(instr->result()); |
3940 DwVfpRegister double_scratch1 = ToDoubleRegister(instr->double_temp()); | 4002 DwVfpRegister double_scratch1 = ToDoubleRegister(instr->double_temp()); |
3941 DwVfpRegister double_scratch2 = double_scratch0(); | 4003 DwVfpRegister double_scratch2 = double_scratch0(); |
3942 Register temp1 = ToRegister(instr->temp1()); | 4004 Register temp1 = ToRegister(instr->temp1()); |
3943 Register temp2 = ToRegister(instr->temp2()); | 4005 Register temp2 = ToRegister(instr->temp2()); |
3944 | 4006 |
3945 MathExpGenerator::EmitMathExp( | 4007 MathExpGenerator::EmitMathExp( |
3946 masm(), input, result, double_scratch1, double_scratch2, | 4008 masm(), input, result, double_scratch1, double_scratch2, |
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5856 __ sub(scratch, result, Operand::PointerOffsetFromSmiKey(index)); | 5918 __ sub(scratch, result, Operand::PointerOffsetFromSmiKey(index)); |
5857 __ ldr(result, FieldMemOperand(scratch, | 5919 __ ldr(result, FieldMemOperand(scratch, |
5858 FixedArray::kHeaderSize - kPointerSize)); | 5920 FixedArray::kHeaderSize - kPointerSize)); |
5859 __ bind(&done); | 5921 __ bind(&done); |
5860 } | 5922 } |
5861 | 5923 |
5862 | 5924 |
5863 #undef __ | 5925 #undef __ |
5864 | 5926 |
5865 } } // namespace v8::internal | 5927 } } // namespace v8::internal |
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