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emit_x64: Make ZeroIfNaN64 branchless

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This commit is contained in:
MerryMage 2016-08-26 15:23:08 +01:00
parent 9901ed0f51
commit 065c53ebfc
1 changed files with 13 additions and 13 deletions
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26
src/backend_x64/emit_x64.cpp
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@ -1300,13 +1300,10 @@ static void DefaultNaN64(BlockOfCode* code, Xbyak::Xmm xmm_value) {
code->L(end);
}
static void ZeroIfNaN64(BlockOfCode* code, Xbyak::Xmm xmm_value) {
Xbyak::Label end;
code->ucomisd(xmm_value, xmm_value);
code->jnp(end);
code->pxor(xmm_value, xmm_value);
code->L(end);
static void ZeroIfNaN64(BlockOfCode* code, Xbyak::Xmm xmm_value, Xbyak::Xmm xmm_scratch) {
code->pxor(xmm_scratch, xmm_scratch);
code->cmpordsd(xmm_scratch, xmm_value); // true mask when ordered (i.e.: when not an NaN)
code->pand(xmm_value, xmm_scratch);
}
static void FPThreeOp32(BlockOfCode* code, RegAlloc& reg_alloc, IR::Block& block, IR::Inst* inst, void (Xbyak::CodeGenerator::*fn)(const Xbyak::Xmm&, const Xbyak::Operand&)) {
@ -1532,6 +1529,7 @@ void EmitX64::EmitFPSingleToS32(IR::Block& block, IR::Inst* inst) {
Xbyak::Xmm from = reg_alloc.UseScratchXmm(a);
Xbyak::Xmm to = reg_alloc.DefXmm(inst);
Xbyak::Reg32 gpr_scratch = reg_alloc.ScratchGpr().cvt32();
Xbyak::Xmm xmm_scratch = reg_alloc.ScratchXmm();
// ARM saturates on conversion; this differs from x64 which returns a sentinel value.
// Conversion to double is lossless, and allows for clamping.
@ -1547,7 +1545,7 @@ void EmitX64::EmitFPSingleToS32(IR::Block& block, IR::Inst* inst) {
code->cvtsd2si(gpr_scratch, from); // 32 bit gpr
}
// Clamp to output range
ZeroIfNaN64(code, from);
ZeroIfNaN64(code, from, xmm_scratch);
code->minsd(from, code->MFloatMaxS32());
code->maxsd(from, code->MFloatMinS32());
// Second time is for real
@ -1566,6 +1564,7 @@ void EmitX64::EmitFPSingleToU32(IR::Block& block, IR::Inst* inst) {
Xbyak::Xmm from = reg_alloc.UseScratchXmm(a);
Xbyak::Xmm to = reg_alloc.DefXmm(inst);
Xbyak::Reg32 gpr_scratch = reg_alloc.ScratchGpr().cvt32();
Xbyak::Xmm xmm_scratch = reg_alloc.ScratchXmm();
// ARM saturates on conversion; this differs from x64 which returns a sentinel value.
// Conversion to double is lossless, and allows for accurate clamping.
@ -1579,7 +1578,7 @@ void EmitX64::EmitFPSingleToU32(IR::Block& block, IR::Inst* inst) {
DenormalsAreZero32(code, from, gpr_scratch);
}
code->cvtss2sd(from, from);
ZeroIfNaN64(code, from);
ZeroIfNaN64(code, from, xmm_scratch);
// Bring into SSE range
code->addsd(from, code->MFloatMinS32());
// First time is to set flags
@ -1600,7 +1599,7 @@ void EmitX64::EmitFPSingleToU32(IR::Block& block, IR::Inst* inst) {
DenormalsAreZero32(code, from, gpr_scratch);
}
code->cvtss2sd(from, from);
ZeroIfNaN64(code, from);
ZeroIfNaN64(code, from, xmm_scratch);
// Generate masks if out-of-signed-range
code->movaps(xmm_mask, code->MFloatMaxS32());
code->cmpltsd(xmm_mask, from);
@ -1629,6 +1628,7 @@ void EmitX64::EmitFPDoubleToS32(IR::Block& block, IR::Inst* inst) {
Xbyak::Xmm from = reg_alloc.UseScratchXmm(a);
Xbyak::Xmm to = reg_alloc.DefXmm(inst);
Xbyak::Reg32 gpr_scratch = reg_alloc.ScratchGpr().cvt32();
Xbyak::Xmm xmm_scratch = reg_alloc.ScratchXmm();
// ARM saturates on conversion; this differs from x64 which returns a sentinel value.
@ -1642,7 +1642,7 @@ void EmitX64::EmitFPDoubleToS32(IR::Block& block, IR::Inst* inst) {
code->cvtsd2si(gpr_scratch, from); // 32 bit gpr
}
// Clamp to output range
ZeroIfNaN64(code, from);
ZeroIfNaN64(code, from, xmm_scratch);
code->minsd(from, code->MFloatMaxS32());
code->maxsd(from, code->MFloatMinS32());
// Second time is for real
@ -1671,7 +1671,7 @@ void EmitX64::EmitFPDoubleToU32(IR::Block& block, IR::Inst* inst) {
if (block.Location().FPSCR().FTZ()) {
DenormalsAreZero64(code, from, gpr_scratch.cvt64());
}
ZeroIfNaN64(code, from);
ZeroIfNaN64(code, from, xmm_scratch);
// Bring into SSE range
code->addsd(from, code->MFloatMinS32());
// First time is to set flags
@ -1691,7 +1691,7 @@ void EmitX64::EmitFPDoubleToU32(IR::Block& block, IR::Inst* inst) {
if (block.Location().FPSCR().FTZ()) {
DenormalsAreZero64(code, from, gpr_scratch.cvt64());
}
ZeroIfNaN64(code, from);
ZeroIfNaN64(code, from, xmm_scratch);
// Generate masks if out-of-signed-range
code->movaps(xmm_mask, code->MFloatMaxS32());
code->cmpltsd(xmm_mask, from);