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| author | Jakub Jelinek <jakub@redhat.com> | 2022-01-25 12:48:35 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2022-01-25 12:48:35 +0100 |
| commit | 480caa1f4ab1f138435239d67ffe3126c5e27b2b (patch) | |
| tree | e3963231117ec75c9832ce8e7c33a04df15b42b7 /libgfortran | |
| parent | 2e211a02290f3b3533b56c593fc7b95edb8593b0 (diff) | |
| download | gcc-480caa1f4ab1f138435239d67ffe3126c5e27b2b.zip gcc-480caa1f4ab1f138435239d67ffe3126c5e27b2b.tar.gz gcc-480caa1f4ab1f138435239d67ffe3126c5e27b2b.tar.bz2 | |
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.
Diffstat (limited to 'libgfortran')
| -rw-r--r-- | libgfortran/ieee/issignaling_fallback.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/libgfortran/ieee/issignaling_fallback.h b/libgfortran/ieee/issignaling_fallback.h index 4632bc5..5b9e1c8 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. */ |