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nir: Fix constant folding for non-32-bit ifind_msb and clz

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Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16348>
This commit is contained in:
Jason Ekstrand
2022-04-12 12:41:14 -05:00
committed by Marge Bot
parent d98b82a103
commit 4b67d70d22
1 changed files with 2 additions and 2 deletions
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4
src/compiler/nir/nir_opcodes.py
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@@ -480,12 +480,12 @@ for (bit = bit_size - 1; bit >= 0; bit--) {
if ((src0 & (1u << bit)) != 0) if ((src0 & (1u << bit)) != 0)
break; break;
} }
dst = (unsigned)(31 - bit); dst = (unsigned)(bit_size - bit - 1);
""") """)
unop("ifind_msb", tint32, """ unop("ifind_msb", tint32, """
dst = -1; dst = -1;
for (int bit = 31; bit >= 0; bit--) { for (int bit = bit_size - 1; bit >= 0; bit--) {
/* If src0 < 0, we're looking for the first 0 bit. /* If src0 < 0, we're looking for the first 0 bit.
* if src0 >= 0, we're looking for the first 1 bit. * if src0 >= 0, we're looking for the first 1 bit.
*/ */