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* [gcc r13-3195] The true side of x != x should set NAN.
@ 2022-10-10 12:50 Aldy Hernandez
0 siblings, 0 replies; only message in thread
From: Aldy Hernandez @ 2022-10-10 12:50 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:69988cd58becc115b236f88627fe92436baaa674
commit r13-3195-g69988cd58becc115b236f88627fe92436baaa674
Author: Aldy Hernandez <aldyh@redhat.com>
Date: Mon Oct 10 11:15:43 2022 +0200
The true side of x != x should set NAN.
gcc/ChangeLog:
* range-op-float.cc (foperator_not_equal::op1_range): Set NAN on
TRUE side for x != x.
Diff:
---
gcc/range-op-float.cc | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/gcc/range-op-float.cc b/gcc/range-op-float.cc
index 91833d3f855..5ffe38da53a 100644
--- a/gcc/range-op-float.cc
+++ b/gcc/range-op-float.cc
@@ -497,14 +497,17 @@ bool
foperator_not_equal::op1_range (frange &r, tree type,
const irange &lhs,
const frange &op2,
- relation_kind) const
+ relation_kind rel) const
{
switch (get_bool_state (r, lhs, type))
{
case BRS_TRUE:
+ // The TRUE side of op1 != op1 implies op1 is NAN.
+ if (rel == VREL_EQ)
+ r.set_nan (type);
// If the result is true, the only time we know anything is if
// OP2 is a constant.
- if (op2.singleton_p ())
+ else if (op2.singleton_p ())
{
// This is correct even if op1 is NAN, because the following
// range would be ~[tmp, tmp] with the NAN property set to
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