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Diffstat (limited to 'gcc/tree-ssa-ccp.c')
| -rw-r--r-- | gcc/tree-ssa-ccp.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/gcc/tree-ssa-ccp.c b/gcc/tree-ssa-ccp.c index 05a65f6..301316d 100644 --- a/gcc/tree-ssa-ccp.c +++ b/gcc/tree-ssa-ccp.c @@ -2034,6 +2034,7 @@ fold_stmt_r (tree *expr_p, int *walk_subtrees, void *data) bool *inside_addr_expr_p = fold_stmt_r_data->inside_addr_expr_p; bool *changed_p = fold_stmt_r_data->changed_p; tree expr = *expr_p, t; + bool volatile_p = TREE_THIS_VOLATILE (expr); /* ??? It'd be nice if walk_tree had a pre-order option. */ switch (TREE_CODE (expr)) @@ -2159,6 +2160,8 @@ fold_stmt_r (tree *expr_p, int *walk_subtrees, void *data) if (t) { + /* Preserve volatileness of the original expression. */ + TREE_THIS_VOLATILE (t) = volatile_p; *expr_p = t; *changed_p = true; } |