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emit_x64_floating_point: SSE2 implementation for DenormalsAreZero

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This commit is contained in:
MerryMage 2020-04-19 14:38:38 +01:00
parent e41fef4a2a
commit 8bef1afb9a
1 changed files with 12 additions and 10 deletions
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22
src/backend/x64/emit_x64_floating_point.cpp
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@ -87,19 +87,21 @@ std::optional<int> ConvertRoundingModeToX64Immediate(FP::RoundingMode rounding_m
}
template<size_t fsize>
void DenormalsAreZero(BlockOfCode& code, EmitContext& ctx, std::initializer_list<Xbyak::Xmm> to_daz, Xbyak::Xmm tmp) {
void DenormalsAreZero(BlockOfCode& code, EmitContext& ctx, std::initializer_list<Xbyak::Xmm> to_daz) {
if (ctx.FPCR().FZ()) {
for (const Xbyak::Xmm& xmm : to_daz) {
// TODO: Optimize
code.movaps(tmp, code.MConst(xword, fsize == 32 ? f32_non_sign_mask : f64_non_sign_mask));
code.andps(tmp, xmm);
code.movaps(xmm0, code.MConst(xword, fsize == 32 ? f32_non_sign_mask : f64_non_sign_mask));
code.andps(xmm0, xmm);
if constexpr (fsize == 32) {
code.pcmpgtd(tmp, code.MConst(xword, f32_smallest_normal - 1));
code.pcmpgtd(xmm0, code.MConst(xword, f32_smallest_normal - 1));
} else if (code.DoesCpuSupport(Xbyak::util::Cpu::tSSE42)) {
code.pcmpgtq(xmm0, code.MConst(xword, f64_smallest_normal - 1));
} else {
code.pcmpgtq(tmp, code.MConst(xword, f64_smallest_normal - 1));
code.pcmpgtd(xmm0, code.MConst(xword, f64_smallest_normal - 1));
code.pshufd(xmm0, xmm0, 0b11100101);
}
code.orps(tmp, code.MConst(xword, fsize == 32 ? f32_negative_zero : f64_negative_zero));
code.andps(xmm, tmp);
code.orps(xmm0, code.MConst(xword, fsize == 32 ? f32_negative_zero : f64_negative_zero));
code.andps(xmm, xmm0);
}
}
}
@ -407,7 +409,7 @@ static void EmitFPMinMax(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
const Xbyak::Xmm tmp = ctx.reg_alloc.ScratchXmm();
const Xbyak::Reg64 gpr_scratch = ctx.reg_alloc.ScratchGpr();
DenormalsAreZero<fsize>(code, ctx, {result, operand}, tmp);
DenormalsAreZero<fsize>(code, ctx, {result, operand});
Xbyak::Label equal, end, nan;
@ -468,7 +470,7 @@ static void EmitFPMinMaxNumeric(BlockOfCode& code, EmitContext& ctx, IR::Inst* i
Xbyak::Label end, z, nan, op2_is_nan, snan, maybe_both_nan, normal;
DenormalsAreZero<fsize>(code, ctx, {op1, op2}, xmm0);
DenormalsAreZero<fsize>(code, ctx, {op1, op2});
FCODE(ucomis)(op1, op2);
code.jz(z, code.T_NEAR);
code.L(normal);