diff options
Diffstat (limited to 'gcc/range-op-float.cc')
| -rw-r--r-- | gcc/range-op-float.cc | 40 |
1 files changed, 35 insertions, 5 deletions
diff --git a/gcc/range-op-float.cc b/gcc/range-op-float.cc index 74ac465..2db83ae 100644 --- a/gcc/range-op-float.cc +++ b/gcc/range-op-float.cc @@ -607,6 +607,10 @@ foperator_equal::fold_range (irange &r, tree type, { if (op1 == op2) r = range_true (type); + // If one operand is -0.0 and other 0.0, they are still equal. + else if (real_iszero (&op1.lower_bound ()) + && real_iszero (&op2.lower_bound ())) + r = range_true (type); else r = range_false (type); } @@ -617,7 +621,18 @@ foperator_equal::fold_range (irange &r, tree type, frange tmp = op1; tmp.intersect (op2); if (tmp.undefined_p ()) - r = range_false (type); + { + // If one range is [whatever, -0.0] and another + // [0.0, whatever2], we don't know anything either, + // because -0.0 == 0.0. + if ((real_iszero (&op1.upper_bound ()) + && real_iszero (&op2.lower_bound ())) + || (real_iszero (&op1.lower_bound ()) + && real_iszero (&op2.upper_bound ()))) + r = range_true_and_false (type); + else + r = range_false (type); + } else r = range_true_and_false (type); } @@ -708,10 +723,14 @@ foperator_not_equal::fold_range (irange &r, tree type, // consist of a single value, and then compare them. else if (op1.singleton_p () && op2.singleton_p ()) { - if (op1 != op2) - r = range_true (type); - else + if (op1 == op2) r = range_false (type); + // If one operand is -0.0 and other 0.0, they are still equal. + else if (real_iszero (&op1.lower_bound ()) + && real_iszero (&op2.lower_bound ())) + r = range_false (type); + else + r = range_true (type); } else if (!maybe_isnan (op1, op2)) { @@ -720,7 +739,18 @@ foperator_not_equal::fold_range (irange &r, tree type, frange tmp = op1; tmp.intersect (op2); if (tmp.undefined_p ()) - r = range_true (type); + { + // If one range is [whatever, -0.0] and another + // [0.0, whatever2], we don't know anything either, + // because -0.0 == 0.0. + if ((real_iszero (&op1.upper_bound ()) + && real_iszero (&op2.lower_bound ())) + || (real_iszero (&op1.lower_bound ()) + && real_iszero (&op2.upper_bound ()))) + r = range_true_and_false (type); + else + r = range_true (type); + } else r = range_true_and_false (type); } |