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[CPU] Replace x86 SSE intrinsics with portable code in Value::Permute

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This commit is contained in:
Herman S.
2026-03-15 22:06:55 +09:00
parent 5e636ac335
commit 56ac1c3f4b
1 changed files with 16 additions and 13 deletions
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29
src/xenia/cpu/hir/value.cc
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@@ -869,17 +869,20 @@ void Value::Permute(Value* src1, Value* src2, TypeName type) {
perm.u8[i * 2] = v * 2;
perm.u8[i * 2 + 1] = v * 2 + 1;
}
auto lod = [](const vec128_t& v) {
return _mm_loadu_si128((const __m128i*)&v);
};
auto sto = [](vec128_t& v, __m128i x) {
return _mm_storeu_si128((__m128i*)&v, x);
// Shuffle bytes: for each byte in perm, select from src
// (equivalent to _mm_shuffle_epi8)
auto shuffle_bytes = [](const vec128_t& src, const vec128_t& idx,
vec128_t& out) {
for (int i = 0; i < 16; i++) {
uint8_t sel = idx.u8[i];
out.u8[i] = (sel & 0x80) ? 0 : src.u8[sel & 0xF];
}
};
__m128i xmm1 = lod(src1->constant.v128);
__m128i xmm2 = lod(src2->constant.v128);
xmm1 = _mm_shuffle_epi8(xmm1, lod(perm));
xmm2 = _mm_shuffle_epi8(xmm2, lod(perm));
vec128_t shuf1, shuf2;
shuffle_bytes(src1->constant.v128, perm, shuf1);
shuffle_bytes(src2->constant.v128, perm, shuf2);
uint8_t mask = 0;
for (int i = 0; i < 8; i++) {
if (perm_ctrl.i16[i] == 0) {
@@ -887,15 +890,15 @@ void Value::Permute(Value* src1, Value* src2, TypeName type) {
}
}
vec128_t unp_mask = vec128b(0);
// Blend: select from shuf1 where mask bit is set, shuf2 otherwise
for (int i = 0; i < 8; i++) {
if (mask & (1 << i)) {
unp_mask.u16[i] = 0xFFFF;
constant.v128.u16[i] = shuf1.u16[i];
} else {
constant.v128.u16[i] = shuf2.u16[i];
}
}
sto(constant.v128, _mm_blendv_epi8(xmm1, xmm2, lod(unp_mask)));
} else {
assert_unhandled_case(type);
}