diff options
Diffstat (limited to 'gcc/tree-ssa.c')
| -rw-r--r-- | gcc/tree-ssa.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/gcc/tree-ssa.c b/gcc/tree-ssa.c index 60b2c4c3ac8..a7c87332519 100644 --- a/gcc/tree-ssa.c +++ b/gcc/tree-ssa.c @@ -1342,6 +1342,18 @@ non_rewritable_lvalue_p (tree lhs) tree decl = TREE_OPERAND (TREE_OPERAND (lhs, 0), 0); if (DECL_P (decl) && DECL_SIZE (decl) == TYPE_SIZE (TREE_TYPE (lhs)) + /* If the dynamic type of the decl has larger precision than + the decl itself we can't use the decls type for SSA rewriting. */ + && ((! INTEGRAL_TYPE_P (TREE_TYPE (decl)) + || compare_tree_int (DECL_SIZE (decl), + TYPE_PRECISION (TREE_TYPE (decl))) == 0) + || (INTEGRAL_TYPE_P (TREE_TYPE (lhs)) + && (TYPE_PRECISION (TREE_TYPE (decl)) + >= TYPE_PRECISION (TREE_TYPE (lhs))))) + /* Make sure we are not re-writing non-float copying into float + copying as that can incur normalization. */ + && (! FLOAT_TYPE_P (TREE_TYPE (decl)) + || types_compatible_p (TREE_TYPE (lhs), TREE_TYPE (decl))) && (TREE_THIS_VOLATILE (decl) == TREE_THIS_VOLATILE (lhs))) return false; } |