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[x64] Add AVX512 optimization for `OPCODE_VECTOR_SUB`(saturated) 

Passes the `vsubuws` and `vsubsws` unit-tests from https://github.com/xenia-project/xenia/pull/1348
This commit is contained in:
Wunkolo 2022-09-18 08:10:19 -07:00 committed by Rick Gibbed
parent cdb40ddb28
commit d73088e5ca
1 changed files with 28 additions and 0 deletions
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28
src/xenia/cpu/backend/x64/x64_seq_vector.cc
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@ -679,6 +679,19 @@ struct VECTOR_SUB
// src1/src2.
e.vpsubd(e.xmm1, src1, src2);
if (e.IsFeatureEnabled(kX64EmitAVX512Ortho)) {
// If the result is less or equal to the first operand then
// we did not underflow
Opmask not_underflow = e.k1;
// _mm_cmple_epu32_mask
e.vpcmpud(not_underflow, e.xmm1, src1, 0x2);
// Copy over values that did not underflow, write zero
// everywhere else
e.vmovdqa32(dest | not_underflow | e.T_z, e.xmm1);
return;
}
// If result is greater than either of the inputs, we've
// underflowed (only need to check one input)
// if (res > src1) then underflowed
@ -690,6 +703,21 @@ struct VECTOR_SUB
} else {
e.vpsubd(e.xmm1, src1, src2);
if (e.IsFeatureEnabled(kX64EmitAVX512Ortho |
kX64EmitAVX512DQ)) {
e.vmovdqa32(e.xmm3, src1);
e.vpternlogd(e.xmm3, e.xmm1, src2, 0b00011000);
const Opmask saturate = e.k1;
e.vpmovd2m(saturate, e.xmm3);
e.vpsrad(e.xmm2, e.xmm1, 31);
e.vpxord(e.xmm2, e.xmm2, e.GetXmmConstPtr(XMMSignMaskI32));
e.vpblendmd(dest | saturate, e.xmm1, e.xmm2);
return;
}
// We can only overflow if the signs of the operands are
// opposite. If signs are opposite and result sign isn't the
// same as src1's sign, we've overflowed. if ((s32b)((src1 ^