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| author | Joseph Myers <joseph@codesourcery.com> | 2016-10-28 21:15:26 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2016-10-28 21:16:58 +0000 |
| commit | f82a4bdb73328bc53bdcc344622acbd96522a83c (patch) | |
| tree | 4e5eddb2c0335ee5655a2014949e6e6f1f7d9b45 /math/math.h | |
| parent | 739e14f9009ff91e4a8d01776e7269fc8cbd0293 (diff) | |
| download | glibc-f82a4bdb73328bc53bdcc344622acbd96522a83c.tar.gz glibc-f82a4bdb73328bc53bdcc344622acbd96522a83c.tar.xz glibc-f82a4bdb73328bc53bdcc344622acbd96522a83c.zip | |
Add SNAN, SNANF, SNANL macros.
TS 18661-1 defines SNAN macros for signaling NaN values, suitable for use in static initializers. This patch adds them to glibc's <math.h> (provided you are building with GCC 3.3 or later; no attempt is made to provide any kind of nonconforming fallback for older compilers without the __builtin_nans functions). Tested for x86_64 and x86. * math/math.h [__GLIBC_USE (IEC_60559_BFP_EXT) && __GNUC_PREREQ (3, 3)] (SNANF): New macro. [__GLIBC_USE (IEC_60559_BFP_EXT) && __GNUC_PREREQ (3, 3)] (SNAN): Likewise. [__GLIBC_USE (IEC_60559_BFP_EXT) && __GNUC_PREREQ (3, 3)] (SNANL): Likewise. * manual/arith.texi (Infinity and NaN): Document SNANF, SNAN and SNANL. * math/test-double.h (snan_value_MACRO): New macro. * math/test-float.h (snan_value_MACRO): Likewise. * math/test-ldouble.h (snan_value_MACRO): Likewise. * math/libm-test.inc (issignaling_test_data): Add tests of snan_value_MACRO.
Diffstat (limited to 'math/math.h')
| -rw-r--r-- | math/math.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/math/math.h b/math/math.h index 7c0c709523..70d9b864e8 100644 --- a/math/math.h +++ b/math/math.h @@ -45,6 +45,15 @@ __BEGIN_DECLS # include <bits/nan.h> #endif /* __USE_ISOC99 */ +#if __GLIBC_USE (IEC_60559_BFP_EXT) +/* Signaling NaN macros, if supported. */ +# if __GNUC_PREREQ (3, 3) +# define SNANF (__builtin_nansf ("")) +# define SNAN (__builtin_nans ("")) +# define SNANL (__builtin_nansl ("")) +# endif +#endif + /* Get the architecture specific values describing the floating-point evaluation. The following symbols will get defined: |