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* [gcc(refs/users/aldyh/heads/ranger-relational)] Andrew: Implement operator_minus::op1_op2_relation_effect.
@ 2021-04-21 15:02 Aldy Hernandez
0 siblings, 0 replies; only message in thread
From: Aldy Hernandez @ 2021-04-21 15:02 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:d9b9b6e6d6991884fc53c5fef63b8cbc9d630ae1
commit d9b9b6e6d6991884fc53c5fef63b8cbc9d630ae1
Author: Aldy Hernandez <aldyh@redhat.com>
Date: Tue Apr 20 16:15:41 2021 +0200
Andrew: Implement operator_minus::op1_op2_relation_effect.
Diff:
---
gcc/range-op.cc | 41 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/gcc/range-op.cc b/gcc/range-op.cc
index 62c031e9049..15be669f228 100644
--- a/gcc/range-op.cc
+++ b/gcc/range-op.cc
@@ -1212,6 +1212,11 @@ public:
const wide_int &lh_ub,
const wide_int &rh_lb,
const wide_int &rh_ub) 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_minus;
void
@@ -1226,6 +1231,42 @@ operator_minus::wi_fold (irange &r, tree type,
value_range_with_overflow (r, type, new_lb, new_ub, ov_lb, ov_ub);
}
+bool
+operator_minus::op1_op2_relation_effect (irange &lhs_range, tree type,
+ const irange &op1_range ATTRIBUTE_UNUSED,
+ const irange &op2_range ATTRIBUTE_UNUSED,
+ relation_kind rel) const
+{
+ if (rel == VREL_NONE)
+ return false;
+
+ int_range<2> rel_range;
+ unsigned prec = TYPE_PRECISION (type);
+ signop sgn = TYPE_SIGN (type);
+
+ switch (rel)
+ {
+ // op1 > op2, op1 - op2 can be restricted to [1, max]
+ case GT_EXPR:
+ rel_range = int_range<2> (type, wi::one (prec),
+ wi::max_value (prec, sgn));
+ break;
+ // op1 >= op2, op1 - op2 can be restricted to [0, max]
+ case GE_EXPR:
+ rel_range = int_range<2> (type, wi::zero (prec),
+ wi::max_value (prec, sgn));
+ break;
+ // op1 == op2, op1 - op2 can be restricted to [0, 0]
+ case EQ_EXPR:
+ rel_range = int_range<2> (type, wi::zero (prec), wi::zero (prec));
+ break;
+ default:
+ return false;
+ }
+ lhs_range.intersect (rel_range);
+ return true;
+}
+
bool
operator_minus::op1_range (irange &r, tree type,
const irange &lhs,
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