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emit_x64_vector: Special-case table_size == 1 in EmitVectorTableLookup

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This commit is contained in:
MerryMage 2018-08-19 09:29:41 +01:00
parent a4e1f8a63a
commit e68bd3c6c1
1 changed files with 32 additions and 4 deletions
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36
src/backend_x64/emit_x64_vector.cpp
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@ -2708,11 +2708,41 @@ void EmitX64::EmitVectorTableLookup(EmitContext& ctx, IR::Inst* inst) {
auto table = ctx.reg_alloc.GetArgumentInfo(inst->GetArg(1).GetInst());
const size_t table_size = std::count_if(table.begin(), table.end(), [](const auto& elem){ return !elem.IsVoid(); });
const bool is_defaults_zero = !inst->GetArg(0).IsImmediate() && inst->GetArg(0).GetInst()->GetOpcode() == IR::Opcode::ZeroVector;
if (code.DoesCpuSupport(Xbyak::util::Cpu::tSSSE3) && is_defaults_zero && table_size == 1) {
const Xbyak::Xmm indicies = ctx.reg_alloc.UseScratchXmm(args[2]);
const Xbyak::Xmm xmm_table0 = ctx.reg_alloc.UseScratchXmm(table[0]);
code.paddusb(indicies, code.MConst(xword, 0x7070707070707070, 0x7070707070707070));
code.pshufb(xmm_table0, indicies);
ctx.reg_alloc.DefineValue(inst, xmm_table0);
return;
}
if (code.DoesCpuSupport(Xbyak::util::Cpu::tSSE41) && table_size == 1) {
const Xbyak::Xmm indicies = ctx.reg_alloc.UseXmm(args[2]);
const Xbyak::Xmm defaults = ctx.reg_alloc.UseXmm(args[0]);
const Xbyak::Xmm xmm_table0 = ctx.reg_alloc.UseScratchXmm(table[0]);
if (code.DoesCpuSupport(Xbyak::util::Cpu::tAVX)) {
code.vpaddusb(xmm0, indicies, code.MConst(xword, 0x7070707070707070, 0x7070707070707070));
} else {
code.movaps(xmm0, indicies);
code.paddusb(xmm0, code.MConst(xword, 0x7070707070707070, 0x7070707070707070));
}
code.pshufb(xmm_table0, indicies);
code.pblendvb(xmm_table0, defaults);
ctx.reg_alloc.DefineValue(inst, xmm_table0);
return;
}
if (code.DoesCpuSupport(Xbyak::util::Cpu::tSSE41)) {
const Xbyak::Xmm indicies = ctx.reg_alloc.UseXmm(args[2]);
const Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
const Xbyak::Xmm masked = table_size == 1 ? xmm0 : ctx.reg_alloc.ScratchXmm();
const Xbyak::Xmm masked = ctx.reg_alloc.ScratchXmm();
code.movaps(masked, code.MConst(xword, 0xF0F0F0F0F0F0F0F0, 0xF0F0F0F0F0F0F0F0));
code.pand(masked, indicies);
@ -2726,9 +2756,7 @@ void EmitX64::EmitVectorTableLookup(EmitContext& ctx, IR::Inst* inst) {
for (size_t i = 0; i < table_size; ++i) {
const u64 max_index = Common::Replicate<u64>(i * 16, 8);
if (table_size == 1) {
code.pcmpeqb(masked, code.MConst(xword, max_index, max_index));
} else if (code.DoesCpuSupport(Xbyak::util::Cpu::tAVX)) {
if (code.DoesCpuSupport(Xbyak::util::Cpu::tAVX)) {
code.vpcmpeqb(xmm0, masked, code.MConst(xword, max_index, max_index));
} else {
code.movaps(xmm0, masked);