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SPU LLVM: Optimize FSM following comparison

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- FSM following a comparison instruction can be optimized to a single shuffle instruction
This commit is contained in:
Malcolm Jestadt 2021-01-17 03:45:56 -05:00 committed by Ivan
parent 0ac68def49
commit a2e8e3090c
1 changed files with 17 additions and 0 deletions
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17
rpcs3/Emu/Cell/SPURecompiler.cpp
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@ -6463,6 +6463,23 @@ public:
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)));
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));