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emit_x64_vector: Don't load zero constant from memory in EmitVectorTableLookup

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This commit is contained in:
MerryMage 2018-08-19 21:33:33 +01:00
parent 3bbcca8757
commit 21df1fb539
1 changed files with 8 additions and 5 deletions
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13
src/backend_x64/emit_x64_vector.cpp
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@ -2772,13 +2772,16 @@ void EmitX64::EmitVectorTableLookup(EmitContext& ctx, IR::Inst* inst) {
for (size_t i = 0; i < table_size; ++i) {
const Xbyak::Xmm xmm_table = ctx.reg_alloc.UseScratchXmm(table[i]);
const u64 max_index = Common::Replicate<u64>(i * 16, 8);
const u64 table_index = Common::Replicate<u64>(i * 16, 8);
if (code.DoesCpuSupport(Xbyak::util::Cpu::tAVX)) {
code.vpcmpeqb(xmm0, masked, code.MConst(xword, max_index, max_index));
if (table_index == 0) {
code.pxor(xmm0, xmm0);
code.pcmpeqb(xmm0, masked);
} else if (code.DoesCpuSupport(Xbyak::util::Cpu::tAVX)) {
code.vpcmpeqb(xmm0, masked, code.MConst(xword, table_index, table_index));
} else {
code.movaps(xmm0, masked);
code.pcmpeqb(xmm0, code.MConst(xword, max_index, max_index));
code.movaps(xmm0, code.MConst(xword, table_index, table_index));
code.pcmpeqb(xmm0, masked);
}
code.pshufb(xmm_table, indicies);
code.pblendvb(result, xmm_table);