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emit_x64_vector: Bugfix for EmitVectorReverseBits on AVX-512: Do not reverse bytes without vector

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This commit is contained in:
Merry 2021-03-27 21:32:39 +00:00
parent 4d33feb1fa
commit c28f13af97
1 changed files with 1 additions and 5 deletions
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6
src/backend/x64/emit_x64_vector.cpp
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@ -2770,12 +2770,8 @@ void EmitX64::EmitVectorReverseBits(EmitContext& ctx, IR::Inst* inst) {
const Xbyak::Xmm data = ctx.reg_alloc.UseScratchXmm(args[0]);
if (code.HasAVX512_Icelake() && code.HasSSSE3()) {
// GFNI(vgf2p8affineqb) and SSSE3(pshuf)
// Reverse bits within bytes
if (code.HasAVX512_Icelake()) {
code.vgf2p8affineqb(data, data, code.MConst(xword_b, 0x8040201008040201), 0);
// Reverse bytes within vector
code.pshufb(data, code.MConst(xword, 0x0001020304050607, 0x08090a0b0c0d0e0f));
} else {
const Xbyak::Xmm high_nibble_reg = ctx.reg_alloc.ScratchXmm();
code.movdqa(high_nibble_reg, code.MConst(xword, 0xF0F0F0F0F0F0F0F0, 0xF0F0F0F0F0F0F0F0));