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SPU LLVM: Optimize FSM following comparison #9616

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merged 1 commit into from Jan 17, 2021
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SPU LLVM: Optimize FSM following comparison #9616

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17 changes: 17 additions & 0 deletions rpcs3/Emu/Cell/SPURecompiler.cpp
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Expand Up @@ -6463,6 +6463,23 @@ class spu_llvm_recompiler : public spu_recompiler_base, public cpu_translator

void FSM(spu_opcode_t op)
{
// FSM following a comparison instruction
if (match_vr<s8[16], s16[8], s32[4], s64[2]>(op.ra, [&](auto c, auto MP)
{
using VT = typename decltype(MP)::type;

if (auto [ok, x] = match_expr(c, sext<VT>(match<bool[std::extent_v<VT>]>())); ok)
{
set_vr(op.rt, (splat_scalar(c)));
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return true;
}

return false;
}))
{
return;
}

const auto v = extract(get_vr(op.ra), 3);
const auto m = bitcast<bool[4]>(trunc<i4>(v));
set_vr(op.rt, sext<s32[4]>(m));
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