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emit_x64_vector: SSE4.1 implementation of EmitVectorTableLookup

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MerryMage 2018-08-18 21:48:18 +01:00
parent 0c18b85c27
commit a4e1f8a63a
1 changed files with 33 additions and 0 deletions
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33
src/backend_x64/emit_x64_vector.cpp
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@ -2709,6 +2709,39 @@ void EmitX64::EmitVectorTableLookup(EmitContext& ctx, IR::Inst* inst) {
const size_t table_size = std::count_if(table.begin(), table.end(), [](const auto& elem){ return !elem.IsVoid(); });
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();
code.movaps(masked, code.MConst(xword, 0xF0F0F0F0F0F0F0F0, 0xF0F0F0F0F0F0F0F0));
code.pand(masked, indicies);
const Xbyak::Xmm xmm_table0 = ctx.reg_alloc.UseScratchXmm(table[0]);
const Xbyak::Xmm xmm_table1 = table_size > 1 ? ctx.reg_alloc.UseScratchXmm(table[1]) : Xbyak::Xmm{};
const Xbyak::Xmm xmm_table2 = table_size > 2 ? ctx.reg_alloc.UseScratchXmm(table[2]) : Xbyak::Xmm{};
const Xbyak::Xmm xmm_table3 = table_size > 3 ? ctx.reg_alloc.UseScratchXmm(table[3]) : Xbyak::Xmm{};
const std::array<Xbyak::Xmm, 4> xmm_table{xmm_table0, xmm_table1, xmm_table2, xmm_table3};
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)) {
code.vpcmpeqb(xmm0, masked, code.MConst(xword, max_index, max_index));
} else {
code.movaps(xmm0, masked);
code.pcmpeqb(xmm0, code.MConst(xword, max_index, max_index));
}
code.pshufb(xmm_table[i], indicies);
code.pblendvb(result, xmm_table[i]);
}
ctx.reg_alloc.DefineValue(inst, result);
return;
}
const u32 stack_space = static_cast<u32>((table_size + 2) * 16);
code.sub(rsp, stack_space + ABI_SHADOW_SPACE);
for (size_t i = 0; i < table_size; ++i) {