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SPU LLVM: Microfixes

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- Avoid vpermb path in shufb when op.ra == op.rb
- Reverse indices with (c ^ 0xf) rather than (~c) in vpermb path, vpternlogd is a 3 input operation and requires needless mov instructions to avoid destroying inputs
This commit is contained in:
Malcolm Jestadt 2022-06-07 22:32:41 -04:00 committed by Ivan
parent 004d9b09b8
commit 64616f1408
1 changed files with 6 additions and 6 deletions
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12
rpcs3/Emu/Cell/SPURecompiler.cpp
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@ -7695,7 +7695,7 @@ public:
if (auto [ok, bs] = match_expr(b, byteswap(match<u8[16]>())); ok)
{
// Undo endian swapping, and rely on pshufb/vperm2b to re-reverse endianness
if (m_use_avx512_icl)
if (m_use_avx512_icl && (op.ra != op.rb))
{
if (perm_only)
{
@ -7757,19 +7757,19 @@ public:
}
}
if (m_use_avx512_icl)
if (m_use_avx512_icl && (op.ra != op.rb))
{
if (perm_only)
{
set_vr(op.rt4, vperm2b256to128(b, a, eval(~c)));
set_vr(op.rt4, vperm2b256to128(a, b, eval(c ^ 0xf)));
return;
}
const auto m = gf2p8affineqb(c, build<u8[16]>(0x40, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x40, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20), 0x7f);
const auto mm = select(noncast<s8[16]>(m) >= 0, splat<u8[16]>(0), m);
const auto cr = eval(~c);
const auto ab = vperm2b256to128(b, a, cr);
set_vr(op.rt4, select(noncast<s8[16]>(cr) >= 0, mm, ab));
const auto cr = eval(c ^ 0xf);
const auto ab = vperm2b256to128(a, b, cr);
set_vr(op.rt4, select(noncast<s8[16]>(c) >= 0, ab, mm));
return;
}