[gcc r13-2228] Add set/get functions for negative infinity in real.*
Aldy Hernandez
aldyh@gcc.gnu.org
Fri Aug 26 18:45:52 GMT 2022
https://gcc.gnu.org/g:33cae277637d569d66518b6805a84444b8d66e9c
commit r13-2228-g33cae277637d569d66518b6805a84444b8d66e9c
Author: Aldy Hernandez <aldyh@redhat.com>
Date: Sat Aug 20 12:41:53 2022 +0200
Add set/get functions for negative infinity in real.*
For the frange implementation with endpoints I'm about to contribute,
we need to set REAL_VALUE_TYPEs with negative infinity. The support
is already there in real.cc, but it is awkward to get at. One could
call real_inf() and then negate the value, but I've added the ability
to pass the sign argument like many of the existing real.* functions.
I've declared the functions in such a way to avoid changes to the
existing code base:
// Unchanged function returning true for either +-INF.
bool real_isinf (const REAL_VALUE_TYPE *r);
// New overload to be able to specify the sign.
bool real_isinf (const REAL_VALUE_TYPE *r, int sign);
// Replacement function for setting INF, defaults to +INF.
void real_inf (REAL_VALUE_TYPE *, int sign = 0);
gcc/ChangeLog:
* real.cc (real_isinf): New overload.
(real_inf): Add sign argument.
* real.h (real_isinf): New overload.
(real_inf): Add sign argument.
Diff:
---
gcc/real.cc | 14 +++++++++++---
gcc/real.h | 5 ++++-
2 files changed, 15 insertions(+), 4 deletions(-)
diff --git a/gcc/real.cc b/gcc/real.cc
index 4e63b1449c5..dcf41b79f60 100644
--- a/gcc/real.cc
+++ b/gcc/real.cc
@@ -1234,6 +1234,14 @@ real_isinf (const REAL_VALUE_TYPE *r)
return (r->cl == rvc_inf);
}
+/* Determine whether a floating-point value X is infinite with SIGN. */
+
+bool
+real_isinf (const REAL_VALUE_TYPE *r, bool sign)
+{
+ return real_isinf (r) && r->sign == sign;
+}
+
/* Determine whether a floating-point value X is a NaN. */
bool
@@ -2484,12 +2492,12 @@ dconst_sqrt2_ptr (void)
return &value;
}
-/* Fills R with +Inf. */
+/* Fills R with Inf with SIGN. */
void
-real_inf (REAL_VALUE_TYPE *r)
+real_inf (REAL_VALUE_TYPE *r, bool sign)
{
- get_inf (r, 0);
+ get_inf (r, sign);
}
/* Fills R with a NaN whose significand is described by STR. If QUIET,
diff --git a/gcc/real.h b/gcc/real.h
index 845ef29e3a4..e01f9ed7282 100644
--- a/gcc/real.h
+++ b/gcc/real.h
@@ -277,6 +277,9 @@ extern bool real_compare (int, const REAL_VALUE_TYPE *, const REAL_VALUE_TYPE *)
/* Determine whether a floating-point value X is infinite. */
extern bool real_isinf (const REAL_VALUE_TYPE *);
+/* Determine whether a floating-point value X is infinite with SIGN. */
+extern bool real_isinf (const REAL_VALUE_TYPE *, bool sign);
+
/* Determine whether a floating-point value X is a NaN. */
extern bool real_isnan (const REAL_VALUE_TYPE *);
@@ -331,7 +334,7 @@ extern long real_to_target (long *, const REAL_VALUE_TYPE *, format_helper);
extern void real_from_target (REAL_VALUE_TYPE *, const long *,
format_helper);
-extern void real_inf (REAL_VALUE_TYPE *);
+extern void real_inf (REAL_VALUE_TYPE *, bool sign = false);
extern bool real_nan (REAL_VALUE_TYPE *, const char *, int, format_helper);
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