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Remove splat + perm_only & safer single source

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Removed the ARM `is_single_splat && perm_only` path due to it being too niche.

Changed the single source logic to use a `std::optional` rather than a (always set) value + boolean.
This commit is contained in:
Walter 2026-06-26 18:01:51 +10:00
parent d58de9c8c9
commit 7f66f2d8c7
1 changed files with 10 additions and 11 deletions
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21
rpcs3/Emu/Cell/SPULLVMRecompiler.cpp
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@ -7081,7 +7081,7 @@ public:
const auto known_idx = get_known_bits(c);
const bool perm_only = known_idx.Zero[7];
const bool perm_or_zero_only = known_idx.Zero[6];
const bool is_single_source = known_idx.extractBits(1, 4).isConstant() || (op.ra == op.rb && !m_interp_magn);
const bool idx_selects_single = known_idx.extractBits(1, 4).isConstant();
const auto a = get_vr<u8[16]>(op.ra);
const auto b = get_vr<u8[16]>(op.rb);
@ -7127,7 +7127,10 @@ public:
}
// When single source, either indicated by KnownBits or both are the same
const auto only_src = known_idx.One[4] ? bv : av;
const std::optional<value_t<u8[16]>> single_src = (idx_selects_single || (op.ra == op.rb && !m_interp_magn))
? std::make_optional(known_idx.One[4] ? bv : av)
: std::nullopt;
const bool only_src_is_splat = known_idx.One[4] ? b_is_splat : a_is_splat;
// Can combine the special index constants + splat selection into one LUT
@ -7140,13 +7143,9 @@ public:
// NOTE: LLVM doesn't emit BCAX (llvm-project/issues/200699)
// Verify if `(x ^ 0x0F) & 0x?F` is reassociated when upstreamed
if (is_single_source)
if (single_src)
{
if (only_src_is_splat && perm_only)
{
set_vr(op.rt4, only_src);
return;
}
const auto only_src = single_src.value();
if (only_src_is_splat && perm_or_zero_only)
{
@ -7206,15 +7205,15 @@ public:
bool shuf_zero_when_msb = false;
value_t<u8[16]> ab_shuf;
if (is_single_source)
if (single_src)
{
if (only_src_is_splat)
{
ab_shuf = only_src;
ab_shuf = single_src.value();
}
else
{
ab_shuf = eval(pshufb(only_src, cv));
ab_shuf = eval(pshufb(single_src.value(), cv));
shuf_zero_when_msb = true;
}
}