diff options
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 5c97369f20d..12a75ab943c 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -5344,6 +5344,9 @@ extract_muldiv_1 (tree t, tree c, enum tree_code code, tree wide_type) } break; } + /* If the constant is negative, we cannot simplify this. */ + if (tree_int_cst_sgn (c) == -1) + break; /* FALLTHROUGH */ case NEGATE_EXPR: if ((t1 = extract_muldiv (op0, c, code, wide_type)) != 0) @@ -6302,12 +6305,16 @@ fold_widened_comparison (enum tree_code code, tree type, tree arg0, tree arg1) if (TYPE_PRECISION (TREE_TYPE (arg0)) <= TYPE_PRECISION (shorter_type)) return NULL_TREE; - arg1_unw = get_unwidened (arg1, shorter_type); + arg1_unw = get_unwidened (arg1, NULL_TREE); /* If possible, express the comparison in the shorter mode. */ if ((code == EQ_EXPR || code == NE_EXPR || TYPE_UNSIGNED (TREE_TYPE (arg0)) == TYPE_UNSIGNED (shorter_type)) && (TREE_TYPE (arg1_unw) == shorter_type + || ((TYPE_PRECISION (shorter_type) + >= TYPE_PRECISION (TREE_TYPE (arg1_unw))) + && (TYPE_UNSIGNED (shorter_type) + == TYPE_UNSIGNED (TREE_TYPE (arg1_unw)))) || (TREE_CODE (arg1_unw) == INTEGER_CST && (TREE_CODE (shorter_type) == INTEGER_TYPE || TREE_CODE (shorter_type) == BOOLEAN_TYPE) |