diff options
Diffstat (limited to 'gcc/fold-const.c')
| -rw-r--r-- | gcc/fold-const.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/gcc/fold-const.c b/gcc/fold-const.c index 93c5816d9a7..12a8d1a7a40 100644 --- a/gcc/fold-const.c +++ b/gcc/fold-const.c @@ -3455,8 +3455,17 @@ make_range (exp, pin_p, plow, phigh) low = range_binop (PLUS_EXPR, type, n_high, 0, integer_one_node, 0); high = range_binop (MINUS_EXPR, type, n_low, 0, - integer_one_node, 0); - in_p = ! in_p; + integer_one_node, 0); + + /* If the range is of the form +/- [ x+1, x ], we won't + be able to normalize it. But then, it represents the + whole range or the empty set, so make it + +/- [ -, - ]. */ + if (tree_int_cst_equal (n_low, low) + && tree_int_cst_equal (n_high, high)) + low = high = 0; + else + in_p = ! in_p; } else low = n_low, high = n_high; |