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authorJoseph Myers <joseph@codesourcery.com>2016-10-28 21:15:26 +0000
committerJoseph Myers <joseph@codesourcery.com>2016-10-28 21:16:58 +0000
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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.
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diff --git a/manual/arith.texi b/manual/arith.texi
index a5c04e475f..f0f3bb4031 100644
--- a/manual/arith.texi
+++ b/manual/arith.texi
@@ -711,6 +711,15 @@ such as by defining @code{_GNU_SOURCE}, and then you must include
@file{math.h}.)
@end deftypevr
+@comment math.h
+@comment ISO
+@deftypevr Macro float SNANF
+@deftypevrx Macro double SNAN
+@deftypevrx Macro {long double} SNANL
+These macros, defined by TS 18661-1:2014, are constant expressions for
+signaling NaNs.
+@end deftypevr
+
@w{IEEE 754} also allows for another unusual value: negative zero. This
value is produced when you divide a positive number by negative
infinity, or when a negative result is smaller than the limits of