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* [gcc r12-6859] libfortran: Provide fallback __issignalingl for IBM extended long double
@ 2022-01-25 11:50 Jakub Jelinek
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From: Jakub Jelinek @ 2022-01-25 11:50 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:480caa1f4ab1f138435239d67ffe3126c5e27b2b
commit r12-6859-g480caa1f4ab1f138435239d67ffe3126c5e27b2b
Author: Jakub Jelinek <jakub@redhat.com>
Date: Tue Jan 25 12:48:35 2022 +0100
libfortran: Provide fallback __issignalingl for IBM extended long double
On Mon, Jan 17, 2022 at 12:11:59AM +0100, FX via Gcc-patches wrote:
> This patch is the third in my “signaling NaN” series.
> For targets with IEEE support but without the issignaling macro in libc
> (i.e., everywhere except glibc), this allows us to provide a fallback
> implementation.
This doesn't seem to handle the powerpc* IBM double double long double.
__LDBL_IS_IEC_60559__ isn't defined for this type, because it is far from
an IEEE754 type, but it has signaling NaNs - as can be seen in glibc
libc/sysdeps/ieee754/ldbl-128ibm/s_issignalingl.c
the type is a pair of doubles and whether it is a sNaN or qNaN is determined
by whether the first double is a sNaN or qNaN.
2022-01-25 Jakub Jelinek <jakub@redhat.com>
* ieee/issignaling_fallback.h (__issignalingl): Define for
IBM extended long double are returning __issignaling on the
first double.
Diff:
---
libgfortran/ieee/issignaling_fallback.h | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/libgfortran/ieee/issignaling_fallback.h b/libgfortran/ieee/issignaling_fallback.h
index 4632bc510f7..5b9e1c88d6f 100644
--- a/libgfortran/ieee/issignaling_fallback.h
+++ b/libgfortran/ieee/issignaling_fallback.h
@@ -137,6 +137,19 @@ __issignalingl (long double x)
return ret || (((exi & 0x7fff) == 0x7fff) && (hxi > 0xc0000000));
}
+#elif (__LDBL_DIG__ == 31)
+
+/* Long double is 128-bit IBM extended type. */
+
+static inline int
+__issignalingl (long double x)
+{
+ union { long double value; double parts[2]; } u;
+
+ u.value = x;
+ return __issignaling (u.parts[0]);
+}
+
#elif (__LDBL_DIG__ == 33) && __LDBL_IS_IEC_60559__
/* Long double is 128-bit type. */
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