diff options
Diffstat (limited to 'gcc/gimplify.c')
| -rw-r--r-- | gcc/gimplify.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/gcc/gimplify.c b/gcc/gimplify.c index 993f7c2..e491a85 100644 --- a/gcc/gimplify.c +++ b/gcc/gimplify.c @@ -3982,11 +3982,14 @@ gimplify_modify_expr_rhs (tree *expr_p, tree *from_p, tree *to_p, switch (TREE_CODE (*from_p)) { case VAR_DECL: - /* If we're assigning from a constant constructor, move the - constructor expression to the RHS of the MODIFY_EXPR. */ + /* If we're assigning from a read-only variable initialized with + a constructor, do the direct assignment from the constructor, + but only if neither source nor target are volatile since this + latter assignment might end up being done on a per-field basis. */ if (DECL_INITIAL (*from_p) && TREE_READONLY (*from_p) && !TREE_THIS_VOLATILE (*from_p) + && !TREE_THIS_VOLATILE (*to_p) && TREE_CODE (DECL_INITIAL (*from_p)) == CONSTRUCTOR) { tree old_from = *from_p; |