This patch adjusts XORing of ranges where the operands are known to be
equal or not equal.
We should probably do the same thing for the op[12]_range methods.
Tested on x86-64 Linux.
gcc/ChangeLog:
* range-op.cc (operator_bitwise_xor::op1_op2_relation_effect):
New.
---
gcc/range-op.cc | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/gcc/range-op.cc b/gcc/range-op.cc
index 4bdd14dd6f7..b1fb25c77f8 100644
--- a/gcc/range-op.cc
+++ b/gcc/range-op.cc
@@ -3101,6 +3101,11 @@ public:
const irange &lhs,
const irange &op1,
relation_kind rel = VREL_NONE) const;
+ virtual bool op1_op2_relation_effect (irange &lhs_range,
+ tree type,
+ const irange &op1_range,
+ const irange &op2_range,
+ relation_kind rel) const;
} op_bitwise_xor;
void
@@ -3134,6 +3139,34 @@ operator_bitwise_xor::wi_fold (irange &r, tree type,
r.set_varying (type);
}
+bool
+operator_bitwise_xor::op1_op2_relation_effect (irange &lhs_range,
+ tree type,
+ const irange &,
+ const irange &,
+ relation_kind rel) const
+{
+ if (rel == VREL_NONE)
+ return false;
+
+ int_range<2> rel_range;
+
+ switch (rel)
+ {
+ case EQ_EXPR:
+ rel_range.set_zero (type);
+ break;
+ case NE_EXPR:
+ rel_range.set_nonzero (type);
+ break;
+ default:
+ return false;
+ }
+
+ lhs_range.intersect (rel_range);
+ return true;
+}
+
bool
operator_bitwise_xor::op1_range (irange &r, tree type,
const irange &lhs,
--
2.31.1
