aboutsummaryrefslogtreecommitdiff
path: root/math
diff options
context:
space:
mode:
authorJoseph Myers <joseph@codesourcery.com>2016-10-28 21:15:26 +0000
committerJoseph Myers <joseph@codesourcery.com>2016-10-28 21:16:58 +0000
commitf82a4bdb73328bc53bdcc344622acbd96522a83c (patch)
tree4e5eddb2c0335ee5655a2014949e6e6f1f7d9b45 /math
parent739e14f9009ff91e4a8d01776e7269fc8cbd0293 (diff)
downloadglibc-f82a4bdb73328bc53bdcc344622acbd96522a83c.tar
glibc-f82a4bdb73328bc53bdcc344622acbd96522a83c.tar.gz
glibc-f82a4bdb73328bc53bdcc344622acbd96522a83c.tar.bz2
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')
-rw-r--r--math/libm-test.inc2
-rw-r--r--math/math.h9
-rw-r--r--math/test-double.h1
-rw-r--r--math/test-float.h1
-rw-r--r--math/test-ldouble.h1
5 files changed, 14 insertions, 0 deletions
diff --git a/math/libm-test.inc b/math/libm-test.inc
index 710633842c..88420ee613 100644
--- a/math/libm-test.inc
+++ b/math/libm-test.inc
@@ -8901,6 +8901,8 @@ static const struct test_f_i_data issignaling_test_data[] =
TEST_f_b (issignaling, -qnan_value, 0, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_f_b (issignaling, snan_value, 1, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_f_b (issignaling, -snan_value, 1, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+ TEST_f_b (issignaling, snan_value_MACRO, 1, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
+ TEST_f_b (issignaling, -snan_value_MACRO, 1, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
};
static void
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:
diff --git a/math/test-double.h b/math/test-double.h
index b9e8cd840c..e172b8fb4d 100644
--- a/math/test-double.h
+++ b/math/test-double.h
@@ -27,3 +27,4 @@
#define TYPE_STR "double"
#define LITM(x) x
#define FTOSTR snprintf
+#define snan_value_MACRO SNAN
diff --git a/math/test-float.h b/math/test-float.h
index e783c094c9..ea096c8aaa 100644
--- a/math/test-float.h
+++ b/math/test-float.h
@@ -28,3 +28,4 @@
/* Use the double variants of macro constants. */
#define LITM(x) x
#define FTOSTR snprintf
+#define snan_value_MACRO SNANF
diff --git a/math/test-ldouble.h b/math/test-ldouble.h
index b877711758..62c9eb8859 100644
--- a/math/test-ldouble.h
+++ b/math/test-ldouble.h
@@ -27,3 +27,4 @@
#define LIT(x) (x ## L)
#define LITM(x) x ## l
#define FTOSTR snprintf
+#define snan_value_MACRO SNANL