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Diffstat (limited to 'gcc/tree-ssa-ccp.c')
| -rw-r--r-- | gcc/tree-ssa-ccp.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/gcc/tree-ssa-ccp.c b/gcc/tree-ssa-ccp.c index 82933f8..0908d54 100644 --- a/gcc/tree-ssa-ccp.c +++ b/gcc/tree-ssa-ccp.c @@ -2191,6 +2191,9 @@ fold_stmt_r (tree *expr_p, int *walk_subtrees, void *data) t = maybe_fold_stmt_indirect (expr, TREE_OPERAND (expr, 0), integer_zero_node); + /* Avoid folding *"abc" = 5 into 'a' = 5. */ + if (wi->is_lhs && t && TREE_CODE (t) == INTEGER_CST) + t = NULL_TREE; if (!t && TREE_CODE (TREE_OPERAND (expr, 0)) == ADDR_EXPR) /* If we had a good reason for propagating the address here, @@ -2219,8 +2222,10 @@ fold_stmt_r (tree *expr_p, int *walk_subtrees, void *data) Otherwise we'd be wasting time. */ case ARRAY_REF: /* If we are not processing expressions found within an - ADDR_EXPR, then we can fold constant array references. */ - if (!*inside_addr_expr_p) + ADDR_EXPR, then we can fold constant array references. + Don't fold on LHS either, to avoid folding "abc"[0] = 5 + into 'a' = 5. */ + if (!*inside_addr_expr_p && !wi->is_lhs) t = fold_read_from_constant_string (expr); else t = NULL; |