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[PATCH v2] float128: Extend __MATH_TG for float128 support
- From: "Gabriel F. T. Gomes" <gftg at linux dot vnet dot ibm dot com>
- To: libc-alpha at sourceware dot org
- Date: Wed, 17 May 2017 17:04:35 -0300
- Subject: [PATCH v2] float128: Extend __MATH_TG for float128 support
- Authentication-results: sourceware.org; auth=none
Changes since v1:
- Add the new macro __HAVE_GENERIC_SELECTION to sys/cdefs.h to control if
the current compiler invocation has support for _Generic.
- Use the macro above in place of __USE_ISOC11 (which was wrong).
2017-02-23 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
* math/math.h (__MATH_TG): Extend the conditions to add
_Float128 support.
* misc/sys/cdefs.h (__HAVE_GENERIC_SELECTION): New macro.
---
math/math.h | 21 +++++++++++++++++++++
misc/sys/cdefs.h | 16 ++++++++++++++++
2 files changed, 37 insertions(+)
diff --git a/math/math.h b/math/math.h
index 2d1508e..e217080 100644
--- a/math/math.h
+++ b/math/math.h
@@ -343,6 +343,27 @@ extern int signgam;
#ifdef __NO_LONG_DOUBLE_MATH
# define __MATH_TG(TG_ARG, FUNC, ARGS) \
(sizeof (TG_ARG) == sizeof (float) ? FUNC ## f ARGS : FUNC ARGS)
+#elif __HAVE_DISTINCT_FLOAT128
+# if __HAVE_GENERIC_SELECTION
+# define __MATH_TG(TG_ARG, FUNC, ARGS) \
+ _Generic ((TG_ARG), \
+ float: FUNC ## f ARGS, \
+ default: FUNC ARGS, \
+ long double: FUNC ## l ARGS, \
+ _Float128: FUNC ## f128 ARGS)
+# else
+# define __MATH_TG(TG_ARG, FUNC, ARGS) \
+ __builtin_choose_expr \
+ (__builtin_types_compatible_p (__typeof (TG_ARG), float), \
+ FUNC ## f ARGS, \
+ __builtin_choose_expr \
+ (__builtin_types_compatible_p (__typeof (TG_ARG), double), \
+ FUNC ARGS, \
+ __builtin_choose_expr \
+ (__builtin_types_compatible_p (__typeof (TG_ARG), long double), \
+ FUNC ## l ARGS, \
+ FUNC ## f128 ARGS)))
+# endif
#else
# define __MATH_TG(TG_ARG, FUNC, ARGS) \
(sizeof (TG_ARG) == sizeof (float) \
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index 74f9a49..06523bf 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -464,4 +464,20 @@
# define __glibc_macro_warning(msg)
#endif
+/* Support for generic selection (ISO C11) is available in GCC since
+ version 4.9. Previous versions do not provide generic selection,
+ even though they might set __STDC_VERSION__ to 201112L, when in
+ -std=c11 mode. Thus, we must check for !defined __GNUC__ when
+ testing __STDC_VERSION__ for generic selection support.
+ On the other hand, Clang also defines __GNUC__, so a clang-specific
+ check is required to enable the use of generic selection. */
+#if __GNUC_PREREQ (4, 9) \
+ || __glibc_clang_has_extension (c_generic_selections) \
+ || (!defined __GNUC__ && defined __STDC_VERSION__ \
+ && __STDC_VERSION__ >= 201112L)
+# define __HAVE_GENERIC_SELECTION 1
+#else
+# define __HAVE_GENERIC_SELECTION 0
+#endif
+
#endif /* sys/cdefs.h */
--
2.4.11