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* [gcc r13-3245] Add method to query the sign of a NAN.
@ 2022-10-12 6:51 Aldy Hernandez
0 siblings, 0 replies; only message in thread
From: Aldy Hernandez @ 2022-10-12 6:51 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:658788f3480e95f1dda0a143b60be89099e5d3c7
commit r13-3245-g658788f3480e95f1dda0a143b60be89099e5d3c7
Author: Aldy Hernandez <aldyh@redhat.com>
Date: Tue Oct 11 19:21:14 2022 +0200
Add method to query the sign of a NAN.
In writing some range-op entries I noticed we don't have a way to
query the sign of the NAN in a range, unless the range only contains
NAN, in which case you can just use frange::signbit_p. This patch
adds a method that returns TRUE if there exists the possiblity of a
NAN and we know its sign.
gcc/ChangeLog:
* value-range.h (frange::nan_signbit_p): New.
Diff:
---
gcc/value-range.h | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/gcc/value-range.h b/gcc/value-range.h
index cb5e9d0522c..60b989b2b50 100644
--- a/gcc/value-range.h
+++ b/gcc/value-range.h
@@ -328,6 +328,7 @@ public:
bool maybe_isnan (bool sign) const;
bool maybe_isinf () const;
bool signbit_p (bool &signbit) const;
+ bool nan_signbit_p (bool &signbit) const;
private:
void verify_range ();
bool normalize_kind ();
@@ -1358,4 +1359,20 @@ frange::signbit_p (bool &signbit) const
return false;
}
+// If range has a NAN with a known sign, set it in SIGNBIT and return
+// TRUE.
+
+inline bool
+frange::nan_signbit_p (bool &signbit) const
+{
+ if (undefined_p ())
+ return false;
+
+ if (m_pos_nan == m_neg_nan)
+ return false;
+
+ signbit = m_neg_nan;
+ return true;
+}
+
#endif // GCC_VALUE_RANGE_H
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