We didn't fold correctly in the case of 0x1 because we never let the
loop counter hit 0. Switching it to bit >= 0 solves this problem.
Reviewed-by: Bas Nieuwenhuizen <b...@basnieuwenhuizen.nl>
Reviewed-by: Connor Abbott <cwabbo...@gmail.com>
Cc: mesa-sta...@lists.freedesktop.org
---
src/compiler/nir/nir_opcodes.py | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/compiler/nir/nir_opcodes.py b/src/compiler/nir/nir_opcodes.py
index 06ae820..28a0467 100644
--- a/src/compiler/nir/nir_opcodes.py
+++ b/src/compiler/nir/nir_opcodes.py
@@ -308,7 +308,7 @@ for (unsigned bit = 0; bit < 32; bit++) {
unop_convert("ufind_msb", tint32, tuint32, """
dst = -1;
-for (int bit = 31; bit > 0; bit--) {
+for (int bit = 31; bit >= 0; bit--) {
if ((src0 >> bit) & 1) {
dst = bit;
break;
--
2.5.0.400.gff86faf
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