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Bug 1290812 - Part 23: Implement the 64bit variant of Shift on mips32. r=bbouvier 

---
 js/src/jit/MacroAssembler.h                   |  11 ++-
 js/src/jit/mips32/MacroAssembler-mips32-inl.h | 134 ++++++++++++++++++++++++--
 2 files changed, 133 insertions(+), 12 deletions(-)
This commit is contained in:
Shi Dan 2016-10-10 17:08:18 +08:00
Родитель 4774be61d9
Коммит 4fe80d7e0a
2 изменённых файлов: 133 добавлений и 12 удалений
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11
js/src/jit/MacroAssembler.h
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@ -875,17 +875,20 @@ class MacroAssembler : public MacroAssemblerSpecific
inline void lshift64(Imm32 imm, Register64 dest) PER_ARCH;
inline void rshift64(Imm32 imm, Register64 dest) PER_ARCH;
inline void rshift64Arithmetic(Imm32 imm, Register64 dest) DEFINED_ON(x86, x64, arm, mips64);
inline void rshift64Arithmetic(Imm32 imm, Register64 dest)
DEFINED_ON(x86, x64, arm, mips32, mips64);
// On x86_shared these have the constraint that shift must be in CL.
inline void lshift32(Register shift, Register srcDest) PER_SHARED_ARCH;
inline void rshift32(Register shift, Register srcDest) PER_SHARED_ARCH;
inline void rshift32Arithmetic(Register shift, Register srcDest) PER_SHARED_ARCH;
inline void lshift64(Register shift, Register64 srcDest) DEFINED_ON(x86, x64, arm, mips64);
inline void rshift64(Register shift, Register64 srcDest) DEFINED_ON(x86, x64, arm, mips64);
inline void lshift64(Register shift, Register64 srcDest)
DEFINED_ON(x86, x64, arm, mips32, mips64);
inline void rshift64(Register shift, Register64 srcDest)
DEFINED_ON(x86, x64, arm, mips32, mips64);
inline void rshift64Arithmetic(Register shift, Register64 srcDest)
DEFINED_ON(x86, x64, arm, mips64);
DEFINED_ON(x86, x64, arm, mips32, mips64);
// ===============================================================
// Rotation functions

134
js/src/jit/mips32/MacroAssembler-mips32-inl.h
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@ -239,10 +239,46 @@ MacroAssembler::lshift64(Imm32 imm, Register64 dest)
{
MOZ_ASSERT(0 <= imm.value && imm.value < 64);
ScratchRegisterScope scratch(*this);
as_sll(dest.high, dest.high, imm.value);
as_srl(scratch, dest.low, 32 - imm.value);
as_or(dest.high, dest.high, scratch);
as_sll(dest.low, dest.low, imm.value);
if (imm.value == 0) {
return;
} else if (imm.value < 32) {
as_sll(dest.high, dest.high, imm.value);
as_srl(scratch, dest.low, 32 - imm.value);
as_or(dest.high, dest.high, scratch);
as_sll(dest.low, dest.low, imm.value);
} else {
as_sll(dest.high, dest.low, imm.value - 32);
move32(Imm32(0), dest.low);
}
}
void
MacroAssembler::lshift64(Register unmaskedShift, Register64 dest)
{
Label done, less;
ScratchRegisterScope shift(*this);
ma_and(shift, unmaskedShift, Imm32(0x3f));
ma_b(shift, Imm32(0), &done, Equal);
ma_sll(dest.high, dest.high, shift);
ma_subu(shift, shift, Imm32(32));
ma_b(shift, Imm32(0), &less, LessThan);
ma_sll(dest.high, dest.low, shift);
move32(Imm32(0), dest.low);
ma_b(&done);
bind(&less);
ma_li(SecondScratchReg, Imm32(0));
as_subu(shift, SecondScratchReg, shift);
ma_srl(SecondScratchReg, dest.low, shift);
as_or(dest.high, dest.high, SecondScratchReg);
ma_and(shift, unmaskedShift, Imm32(0x3f));
ma_sll(dest.low, dest.low, shift);
bind(&done);
}
void
@ -264,10 +300,92 @@ MacroAssembler::rshift64(Imm32 imm, Register64 dest)
{
MOZ_ASSERT(0 <= imm.value && imm.value < 64);
ScratchRegisterScope scratch(*this);
as_srl(dest.low, dest.low, imm.value);
as_sll(scratch, dest.high, 32 - imm.value);
as_or(dest.low, dest.low, scratch);
as_srl(dest.high, dest.high, imm.value);
if (imm.value < 32) {
as_srl(dest.low, dest.low, imm.value);
as_sll(scratch, dest.high, 32 - imm.value);
as_or(dest.low, dest.low, scratch);
as_srl(dest.high, dest.high, imm.value);
} else if (imm.value == 32) {
ma_move(dest.low, dest.high);
move32(Imm32(0), dest.high);
} else {
ma_srl(dest.low, dest.high, Imm32(imm.value - 32));
move32(Imm32(0), dest.high);
}
}
void
MacroAssembler::rshift64(Register unmaskedShift, Register64 dest)
{
Label done, less;
ScratchRegisterScope shift(*this);
ma_and(shift, unmaskedShift, Imm32(0x3f));
ma_srl(dest.low, dest.low, shift);
ma_subu(shift, shift, Imm32(32));
ma_b(shift, Imm32(0), &less, LessThan);
ma_srl(dest.low, dest.high, shift);
move32(Imm32(0), dest.high);
ma_b(&done);
bind(&less);
ma_li(SecondScratchReg, Imm32(0));
as_subu(shift, SecondScratchReg, shift);
ma_sll(SecondScratchReg, dest.high, shift);
as_or(dest.low, dest.low, SecondScratchReg);
ma_and(shift, unmaskedShift, Imm32(0x3f));
ma_srl(dest.high, dest.high, shift);
bind(&done);
}
void
MacroAssembler::rshift64Arithmetic(Imm32 imm, Register64 dest)
{
MOZ_ASSERT(0 <= imm.value && imm.value < 64);
ScratchRegisterScope scratch(*this);
if (imm.value < 32) {
as_srl(dest.low, dest.low, imm.value);
as_sll(scratch, dest.high, 32 - imm.value);
as_or(dest.low, dest.low, scratch);
as_sra(dest.high, dest.high, imm.value);
} else if (imm.value == 32) {
ma_move(dest.low, dest.high);
as_sra(dest.high, dest.high, 31);
} else {
as_sra(dest.low, dest.high, imm.value - 32);
as_sra(dest.high, dest.high, 31);
}
}
void
MacroAssembler::rshift64Arithmetic(Register unmaskedShift, Register64 dest)
{
Label done, less;
ScratchRegisterScope shift(*this);
ma_and(shift, unmaskedShift, Imm32(0x3f));
ma_srl(dest.low, dest.low, shift);
ma_subu(shift, shift, Imm32(32));
ma_b(shift, Imm32(0), &less, LessThan);
ma_sra(dest.low, dest.high, shift);
as_sra(dest.high, dest.high, 31);
ma_b(&done);
bind(&less);
ma_li(SecondScratchReg, Imm32(0));
as_subu(shift, SecondScratchReg, shift);
ma_sll(SecondScratchReg, dest.high, shift);
as_or(dest.low, dest.low, SecondScratchReg);
ma_and(shift, unmaskedShift, Imm32(0x3f));
ma_sra(dest.high, dest.high, shift);
bind(&done);
}
// ===============================================================