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[x64] Add `BMI1`-based acceleration for `AndNot` 

In the case of having two register operands for `AndNot`, the `andn` instruction can be used when the host supports `BMI1`. `andn` only supports 32-bit and 64-bit operands, so some register up-casting is needed.
This commit is contained in:
Wunkolo 2022-01-02 16:56:04 -08:00 committed by Rick Gibbed
parent 3ab43d480d
commit 24d4e1e0e5
1 changed files with 16 additions and 6 deletions
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22
src/xenia/cpu/backend/x64/x64_sequences.cc
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@ -2656,13 +2656,23 @@ void EmitAndNotXX(X64Emitter& e, const ARGS& i) {
}
} else {
// neither are constant
if (i.dest == i.src2) {
e.not_(i.dest);
e.and_(i.dest, i.src1);
if (e.IsFeatureEnabled(kX64EmitBMI1)) {
if (i.dest.reg().getBit() == 64) {
e.andn(i.dest.reg().cvt64(), i.src2.reg().cvt64(),
i.src1.reg().cvt64());
} else {
e.andn(i.dest.reg().cvt32(), i.src2.reg().cvt32(),
i.src1.reg().cvt32());
}
} else {
e.mov(i.dest, i.src2);
e.not_(i.dest);
e.and_(i.dest, i.src1);
if (i.dest == i.src2) {
e.not_(i.dest);
e.and_(i.dest, i.src1);
} else {
e.mov(i.dest, i.src2);
e.not_(i.dest);
e.and_(i.dest, i.src1);
}
}
}
}