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implement more accurately inaccurate frsqrte

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This commit is contained in:
disjtqz
2023-10-01 15:06:33 -04:00
committed by Radosław Gliński
parent 79465708aa
commit 67f16c4e31
3 changed files with 141 additions and 7 deletions
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10
src/xenia/cpu/backend/x64/x64_sequences.cc
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@@ -2110,13 +2110,9 @@ struct RSQRT_F64 : Sequence<RSQRT_F64, I<OPCODE_RSQRT, F64Op, F64Op>> {
static void Emit(X64Emitter& e, const EmitArgType& i) {
e.ChangeMxcsrMode(MXCSRMode::Fpu);
Xmm src1 = GetInputRegOrConstant(e, i.src1, e.xmm3);
if (e.IsFeatureEnabled(kX64EmitAVX512Ortho)) {
e.vrsqrt14sd(i.dest, src1, src1);
} else {
e.vmovapd(e.xmm0, e.GetXmmConstPtr(XMMOnePD));
e.vsqrtsd(e.xmm1, src1, src1);
e.vdivsd(i.dest, e.xmm0, e.xmm1);
}
e.vmovsd(e.xmm0, src1);
e.call(e.backend()->frsqrtefp_helper);
e.vmovsd(i.dest, e.xmm0);
}
};
struct RSQRT_V128 : Sequence<RSQRT_V128, I<OPCODE_RSQRT, V128Op, V128Op>> {