From f82a4bdb73328bc53bdcc344622acbd96522a83c Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Fri, 28 Oct 2016 21:15:26 +0000 Subject: 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 (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. --- math/math.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'math/math.h') diff --git a/math/math.h b/math/math.h index 7c0c709..70d9b86 100644 --- a/math/math.h +++ b/math/math.h @@ -45,6 +45,15 @@ __BEGIN_DECLS # include #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: -- cgit v1.1