diff options
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 7180662..d444769 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -10831,6 +10831,19 @@ fold_binary_loc (location_t loc, if (tmp) return fold_build2_loc (loc, PLUS_EXPR, type, tmp, arg01); } + /* PTR0 - (PTR1 p+ A) -> (PTR0 - PTR1) - A, assuming PTR0 - PTR1 + simplifies. */ + else if (TREE_CODE (arg1) == POINTER_PLUS_EXPR) + { + tree arg10 = fold_convert_loc (loc, type, + TREE_OPERAND (arg1, 0)); + tree arg11 = fold_convert_loc (loc, type, + TREE_OPERAND (arg1, 1)); + tree tmp = fold_binary_loc (loc, MINUS_EXPR, type, arg0, + fold_convert_loc (loc, type, arg10)); + if (tmp) + return fold_build2_loc (loc, MINUS_EXPR, type, tmp, arg11); + } } /* A - (-B) -> A + B */ if (TREE_CODE (arg1) == NEGATE_EXPR) |