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emit_x64_floating_point: DenormalsAreZero is redundant as hardware already does DAZ

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Exceptions: F{MIN,MAX}{,NM}
This commit is contained in:
MerryMage 2018-07-31 18:03:59 +01:00
parent de9d8c461c
commit 8ef195db3c
1 changed files with 15 additions and 44 deletions
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59
src/backend_x64/emit_x64_floating_point.cpp
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@ -205,11 +205,7 @@ void FPTwoOp(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, Function fn) {
Xbyak::Label end;
Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
Xbyak::Reg64 gpr_scratch = ctx.reg_alloc.ScratchGpr();
if (ctx.FPSCR_FTZ()) {
DenormalsAreZero<fsize>(code, result, gpr_scratch);
}
if (ctx.AccurateNaN() && !ctx.FPSCR_DN()) {
end = ProcessNaN<fsize>(code, result);
}
@ -228,8 +224,13 @@ void FPTwoOp(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, Function fn) {
ctx.reg_alloc.DefineValue(inst, result);
}
enum class CallDenormalsAreZero {
Yes,
No,
};
template <size_t fsize, typename PreprocessFunction, typename Function>
void FPThreeOp(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, [[maybe_unused]] PreprocessFunction preprocess, Function fn) {
void FPThreeOp(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, [[maybe_unused]] PreprocessFunction preprocess, Function fn, CallDenormalsAreZero call_denormals_are_zero = CallDenormalsAreZero::No) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
Xbyak::Label end;
@ -238,7 +239,7 @@ void FPThreeOp(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, [[maybe_unus
Xbyak::Xmm operand = ctx.reg_alloc.UseScratchXmm(args[1]);
Xbyak::Reg64 gpr_scratch = ctx.reg_alloc.ScratchGpr();
if (ctx.FPSCR_FTZ()) {
if (ctx.FPSCR_FTZ() && call_denormals_are_zero == CallDenormalsAreZero::Yes) {
DenormalsAreZero<fsize>(code, result, gpr_scratch);
DenormalsAreZero<fsize>(code, operand, gpr_scratch);
}
@ -264,38 +265,8 @@ void FPThreeOp(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, [[maybe_unus
}
template <size_t fsize, typename Function>
void FPThreeOp(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, Function fn) {
FPThreeOp<fsize>(code, ctx, inst, nullptr, fn);
}
template <size_t fsize, typename Function, typename NaNHandler>
void FPFourOp(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, Function fn, NaNHandler nan_handler) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
Xbyak::Label end;
Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
Xbyak::Xmm operand2 = ctx.reg_alloc.UseScratchXmm(args[1]);
Xbyak::Xmm operand3 = ctx.reg_alloc.UseScratchXmm(args[2]);
Xbyak::Reg64 gpr_scratch = ctx.reg_alloc.ScratchGpr();
if (ctx.FPSCR_FTZ()) {
DenormalsAreZero<fsize>(code, result, gpr_scratch);
DenormalsAreZero<fsize>(code, operand2, gpr_scratch);
DenormalsAreZero<fsize>(code, operand3, gpr_scratch);
}
if (ctx.AccurateNaN() && !ctx.FPSCR_DN()) {
PreProcessNaNs<fsize>(code, ctx, result, operand2, operand3, end, nan_handler);
}
fn(result, operand2, operand3);
if (ctx.FPSCR_DN()) {
DefaultNaN<fsize>(code, result);
} else if (ctx.AccurateNaN()) {
PostProcessNaNs<fsize>(code, result, operand2);
}
code.L(end);
ctx.reg_alloc.DefineValue(inst, result);
void FPThreeOp(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, Function fn, CallDenormalsAreZero call_denormals_are_zero = CallDenormalsAreZero::No) {
FPThreeOp<fsize>(code, ctx, inst, nullptr, fn, call_denormals_are_zero);
}
} // anonymous namespace
@ -400,7 +371,7 @@ static void EmitFPMax(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
code.L(equal);
code.andps(result, operand);
code.L(end);
});
}, CallDenormalsAreZero::Yes);
}
void EmitX64::EmitFPMax32(EmitContext& ctx, IR::Inst* inst) {
@ -442,7 +413,7 @@ void EmitX64::EmitFPMaxNumeric32(EmitContext& ctx, IR::Inst* inst) {
code.jnz(normal);
code.andps(operand, result);
code.L(normal);
}, &Xbyak::CodeGenerator::maxss);
}, &Xbyak::CodeGenerator::maxss, CallDenormalsAreZero::Yes);
}
void EmitX64::EmitFPMaxNumeric64(EmitContext& ctx, IR::Inst* inst) {
@ -476,7 +447,7 @@ void EmitX64::EmitFPMaxNumeric64(EmitContext& ctx, IR::Inst* inst) {
code.jnz(normal);
code.andps(operand, result);
code.L(normal);
}, &Xbyak::CodeGenerator::maxsd);
}, &Xbyak::CodeGenerator::maxsd, CallDenormalsAreZero::Yes);
}
template<size_t fsize>
@ -527,7 +498,7 @@ static void EmitFPMin(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
code.L(equal);
code.orps(result, operand);
code.L(end);
});
}, CallDenormalsAreZero::Yes);
}
void EmitX64::EmitFPMin32(EmitContext& ctx, IR::Inst* inst) {
@ -569,7 +540,7 @@ void EmitX64::EmitFPMinNumeric32(EmitContext& ctx, IR::Inst* inst) {
code.jnz(normal);
code.orps(operand, result);
code.L(normal);
}, &Xbyak::CodeGenerator::minss);
}, &Xbyak::CodeGenerator::minss, CallDenormalsAreZero::Yes);
}
void EmitX64::EmitFPMinNumeric64(EmitContext& ctx, IR::Inst* inst) {
@ -603,7 +574,7 @@ void EmitX64::EmitFPMinNumeric64(EmitContext& ctx, IR::Inst* inst) {
code.jnz(normal);
code.orps(operand, result);
code.L(normal);
}, &Xbyak::CodeGenerator::minsd);
}, &Xbyak::CodeGenerator::minsd, CallDenormalsAreZero::Yes);
}
void EmitX64::EmitFPMul32(EmitContext& ctx, IR::Inst* inst) {