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Bug 1298747 - IonMonkey: MIPS: Uses conditional move in MacroAssembler::clampIntToUint8. r=arai

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---
 js/src/jit/mips32/MacroAssembler-mips32.cpp | 28 ++++++++--------------------
 js/src/jit/mips64/MacroAssembler-mips64.cpp | 28 ++++++++--------------------
 2 files changed, 16 insertions(+), 40 deletions(-)
This commit is contained in:
Heiher 2016-08-29 18:22:30 +08:00
parent 0d349d1164
commit 2415f073ee
2 changed files with 16 additions and 40 deletions
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28
js/src/jit/mips32/MacroAssembler-mips32.cpp
View File

@ -1067,26 +1067,14 @@ MacroAssemblerMIPSCompat::storePtr(Register src, AbsoluteAddress dest)
void
MacroAssemblerMIPSCompat::clampIntToUint8(Register reg)
{
// look at (reg >> 8) if it is 0, then src shouldn't be clamped
// if it is <0, then we want to clamp to 0,
// otherwise, we wish to clamp to 255
Label done;
ma_move(ScratchRegister, reg);
asMasm().rshiftPtrArithmetic(Imm32(8), ScratchRegister);
ma_b(ScratchRegister, ScratchRegister, &done, Assembler::Zero, ShortJump);
{
Label negative;
ma_b(ScratchRegister, ScratchRegister, &negative, Assembler::Signed, ShortJump);
{
ma_li(reg, Imm32(255));
ma_b(&done, ShortJump);
}
bind(&negative);
{
ma_move(reg, zero);
}
}
bind(&done);
// If reg is < 0, then we want to clamp to 0.
as_slti(ScratchRegister, reg, 0);
as_movn(reg, zero, ScratchRegister);
// If reg is >= 255, then we want to clamp to 255.
ma_li(SecondScratchReg, Imm32(255));
as_slti(ScratchRegister, reg, 255);
as_movz(reg, SecondScratchReg, ScratchRegister);
}
// Note: this function clobbers the input register.

28
js/src/jit/mips64/MacroAssembler-mips64.cpp
View File

@ -1214,26 +1214,14 @@ MacroAssemblerMIPS64Compat::storePtr(Register src, AbsoluteAddress dest)
void
MacroAssemblerMIPS64Compat::clampIntToUint8(Register reg)
{
// look at (reg >> 8) if it is 0, then src shouldn't be clamped
// if it is <0, then we want to clamp to 0,
// otherwise, we wish to clamp to 255
Label done;
ma_move(ScratchRegister, reg);
asMasm().rshiftPtrArithmetic(Imm32(8), ScratchRegister);
ma_b(ScratchRegister, ScratchRegister, &done, Assembler::Zero, ShortJump);
{
Label negative;
ma_b(ScratchRegister, ScratchRegister, &negative, Assembler::Signed, ShortJump);
{
ma_li(reg, Imm32(255));
ma_b(&done, ShortJump);
}
bind(&negative);
{
ma_move(reg, zero);
}
}
bind(&done);
// If reg is < 0, then we want to clamp to 0.
as_slti(ScratchRegister, reg, 0);
as_movn(reg, zero, ScratchRegister);
// If reg is >= 255, then we want to clamp to 255.
ma_li(SecondScratchReg, Imm32(255));
as_slti(ScratchRegister, reg, 255);
as_movz(reg, SecondScratchReg, ScratchRegister);
}
// Note: this function clobbers the input register.