https://gcc.gnu.org/g:3ef3de7a7329d5c76bed31e8b49a2a661c45f72f
commit r15-10185-g3ef3de7a7329d5c76bed31e8b49a2a661c45f72f
Author: Richard Biener <rguent...@suse.de>
Date: Thu Jul 31 13:06:36 2025 +0200
tree-optimization/121320 - UBSAN error in ao_ref_init_from_vn_reference
The multiplication by BITS_PER_UNIT should be done in poly_offset_int.
PR tree-optimization/121320
* tree-ssa-sccvn.cc (ao_ref_init_from_vn_reference): Convert
op->off to poly_offset_int before multiplying by
BITS_PER_UNIT.
(cherry picked from commit ff6f7d8e005ae94ffd55f1dba727e28531c3daf3)
Diff:
---
gcc/tree-ssa-sccvn.cc | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/gcc/tree-ssa-sccvn.cc b/gcc/tree-ssa-sccvn.cc
index 7f2500e5d591..9bf25c67dc95 100644
--- a/gcc/tree-ssa-sccvn.cc
+++ b/gcc/tree-ssa-sccvn.cc
@@ -1219,7 +1219,7 @@ ao_ref_init_from_vn_reference (ao_ref *ref,
offset = 0;
}
else
- offset += pop->off * BITS_PER_UNIT;
+ offset += poly_offset_int (pop->off) * BITS_PER_UNIT;
op0_p = NULL;
break;
}
@@ -1270,7 +1270,7 @@ ao_ref_init_from_vn_reference (ao_ref *ref,
if (maybe_eq (op->off, -1))
max_size = -1;
else
- offset += op->off * BITS_PER_UNIT;
+ offset += poly_offset_int (op->off) * BITS_PER_UNIT;
break;
case REALPART_EXPR:
