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* [gcc r13-2742] frange::maybe_isnan() should return FALSE for undefined ranges.
@ 2022-09-20 18:22 Aldy Hernandez
0 siblings, 0 replies; only message in thread
From: Aldy Hernandez @ 2022-09-20 18:22 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:2438b6a4c8df0d1870881e123cc74cc62b7e58e8
commit r13-2742-g2438b6a4c8df0d1870881e123cc74cc62b7e58e8
Author: Aldy Hernandez <aldyh@redhat.com>
Date: Tue Sep 20 16:09:31 2022 +0200
frange::maybe_isnan() should return FALSE for undefined ranges.
Undefined ranges have undefined NAN bits. We can't depend on them,
as they may contain garbage. This patch returns false from
maybe_isnan() for undefined ranges (the empty set).
gcc/ChangeLog:
* value-range.h (frange::maybe_isnan): Return false for
undefined ranges.
Diff:
---
gcc/value-range.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/gcc/value-range.h b/gcc/value-range.h
index 7d5584a9294..325ed08f290 100644
--- a/gcc/value-range.h
+++ b/gcc/value-range.h
@@ -1210,6 +1210,8 @@ frange::known_isinf () const
inline bool
frange::maybe_isnan () const
{
+ if (undefined_p ())
+ return false;
return m_pos_nan || m_neg_nan;
}
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