https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106628
Bug ID: 106628
Summary: Missed folding with COMPOUND_EXPR due to C frontend
bugs
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
Target Milestone: ---
Doing
diff --git a/gcc/fold-const.cc b/gcc/fold-const.cc
index 4f4ec81c8d4..698f115507a 100644
--- a/gcc/fold-const.cc
+++ b/gcc/fold-const.cc
@@ -12595,14 +12595,9 @@ fold_binary_loc (location_t loc, enum tree_code code,
tree type,
return NULL_TREE;
case COMPOUND_EXPR:
- /* When pedantic, a compound expression can be neither an lvalue
- nor an integer constant expression. */
- if (TREE_SIDE_EFFECTS (arg0) || TREE_CONSTANT (arg1))
+ if (TREE_SIDE_EFFECTS (arg0))
return NULL_TREE;
- /* Don't let (0, 0) be null pointer constant. */
- tem = integer_zerop (arg1) ? build1_loc (loc, NOP_EXPR, type, arg1)
- : fold_convert_loc (loc, type, arg1);
- return tem;
+ return op1;
case ASSERT_EXPR:
/* An ASSERT_EXPR should never be passed to fold_binary. */
results in missed diagnostics:
FAIL: gcc.dg/array-5.c bad vla handling (test for bogus messages, line 40)
FAIL: gcc.dg/c99-const-expr-12.c (test for excess errors)
FAIL: gcc.dg/pr61096-1.c (test for errors, line 29)
FAIL: gcc.dg/pr61096-1.c (test for excess errors)
