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nir: Avoid UB of (int)0xff << 24 evaluating usadd_4x8_vc4.

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Caught by UBSan on introduction of nir_opt_algebraic_pattern_test.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39184>
This commit is contained in:
Emma Anholt 2025-12-23 15:57:03 -08:00 • committed by Marge Bot
parent a8224e3e00
commit feffd0e445
1 changed files with 1 additions and 1 deletions
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2
src/compiler/nir/nir_opcodes.py
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@ -1502,7 +1502,7 @@ if (!isnormal(dst))
binop("usadd_4x8_vc4", tint32, _2src_commutative + associative, """
dst = 0;
for (int i = 0; i < 32; i += 8) {
dst |= MIN2(((src0 >> i) & 0xff) + ((src1 >> i) & 0xff), 0xff) << i;
dst |= (uint32_t)MIN2(((src0 >> i) & 0xff) + ((src1 >> i) & 0xff), 0xff) << i;
}
""")