Commit 932522a9ddc ("tcg/optimize: Fold and to extract during optimize",
2025-06-30) inadvertently disabled affected bits optimizations on
operations that use fold_masks_zosa. These happen relatively often
in x86 code for extract/sextract; for example given the following:
mov %esi, %ebp
xor $0x1, %ebp
the optimizer is able to simplify the "extract_i64 rbp,tmp0,$0x0,$0x20"
produced by the second instruction to a move.
Signed-off-by: Paolo Bonzini <[email protected]>
---
tcg/optimize.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tcg/optimize.c b/tcg/optimize.c
index f69702b26e8..c546e8910ba 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -1102,7 +1102,7 @@ static bool fold_masks_zosa_int(OptContext *ctx, TCGOp
*op,
static bool fold_masks_zosa(OptContext *ctx, TCGOp *op, uint64_t z_mask,
uint64_t o_mask, int64_t s_mask, uint64_t a_mask)
{
- fold_masks_zosa_int(ctx, op, z_mask, o_mask, s_mask, -1);
+ fold_masks_zosa_int(ctx, op, z_mask, o_mask, s_mask, a_mask);
return true;
}
--
2.52.0
