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emit_x64_vector: GNFI implementation of EmitVectorCountLeadingZeros8

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Wunkolo 2024-02-04 12:23:29 -08:00 committed by merry
parent 1e5e7a7ae6
commit eb5eb9cdf7
1 changed files with 21 additions and 0 deletions
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21
src/dynarmic/backend/x64/emit_x64_vector.cpp
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@ -946,6 +946,27 @@ static void EmitVectorCountLeadingZeros(VectorArray<T>& result, const VectorArra
}
void EmitX64::EmitVectorCountLeadingZeros8(EmitContext& ctx, IR::Inst* inst) {
if (code.HasHostFeature(HostFeature::GFNI)) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Xmm data = ctx.reg_alloc.UseScratchXmm(args[0]);
const Xbyak::Xmm result = ctx.reg_alloc.ScratchXmm();
// Reverse bits:
code.gf2p8affineqb(data, code.BConst<64>(xword, 0x8040201008040201), 0);
// Perform a tzcnt:
// Isolate lowest set bit
code.pcmpeqb(result, result);
code.paddb(result, data);
code.pandn(result, data);
// Convert lowest set bit into an index
code.gf2p8affineqb(result, code.BConst<64>(xword, 0xaaccf0ff'00000000), 8);
ctx.reg_alloc.DefineValue(inst, result);
return;
}
if (code.HasHostFeature(HostFeature::SSSE3)) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);