Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/optimize.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/tcg/optimize.c b/tcg/optimize.c
index ce065d0e22..795f1c900e 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -2287,7 +2287,7 @@ static bool fold_or(OptContext *ctx, TCGOp *op)
 
 static bool fold_orc(OptContext *ctx, TCGOp *op)
 {
-    uint64_t s_mask;
+    uint64_t z_mask, o_mask, s_mask, a_mask;
     TempOptInfo *t1, *t2;
 
     if (fold_const2(ctx, op) ||
@@ -2318,8 +2318,15 @@ static bool fold_orc(OptContext *ctx, TCGOp *op)
     }
 
     t1 = arg_info(op->args[1]);
+
+    z_mask = t1->z_mask | ~t2->o_mask;
+    o_mask = t1->o_mask | ~t2->z_mask;
     s_mask = t1->s_mask & t2->s_mask;
-    return fold_masks_s(ctx, op, s_mask);
+
+    /* Affected bits are those not known one, masked by those known one. */
+    a_mask = ~t1->o_mask & t2->o_mask;
+
+    return fold_masks_zosa(ctx, op, z_mask, o_mask, s_mask, a_mask);
 }
 
 static bool fold_qemu_ld_1reg(OptContext *ctx, TCGOp *op)
-- 
2.43.0

On 6/3/25 1:08 AM, Richard Henderson wrote:
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>   tcg/optimize.c | 11 +++++++++--
>   1 file changed, 9 insertions(+), 2 deletions(-)

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>