Utilize x86_64 vector math functions w/o -fopenmp.

This patch allows to use x86_64 vector math functions with GCC 6.* without OpenMP SIMD constructs. For additional details please visit <https://sourceware.org/glibc/wiki/libmvec#Example_2>. * sysdeps/x86/fpu/bits/math-vector.h: W/o -fopenmp declare vector math functions with GCC 6.* __attribute__ ((__simd__)).
git-mirror · Dec 7, 2015 · 377ed00 · 377ed00
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diff --git a/ChangeLog b/ChangeLog
@@ -1,3 +1,8 @@
+2015-12-07  Andrew Senkevich  <andrew.senkevich@intel.com>
+
+	* sysdeps/x86/fpu/bits/math-vector.h: W/o -fopenmp use GCC 6.*
+	__attribute__ ((__simd__)) for vector math function declarations.
+
 2015-12-04  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Fix typo in strncat, wcsncat manual entries

diff --git a/sysdeps/x86/fpu/bits/math-vector.h b/sysdeps/x86/fpu/bits/math-vector.h
@@ -28,6 +28,12 @@
 # if defined _OPENMP && _OPENMP >= 201307
 /* OpenMP case.  */
 #  define __DECL_SIMD_x86_64 _Pragma ("omp declare simd notinbranch")
+# elif __GNUC_PREREQ (6,0)
+/* W/o OpenMP use GCC 6.* __attribute__ ((__simd__)).  */
+#  define __DECL_SIMD_x86_64 __attribute__ ((__simd__ ("notinbranch")))
+# endif
+
+# ifdef __DECL_SIMD_x86_64
 #  undef __DECL_SIMD_cos
 #  define __DECL_SIMD_cos __DECL_SIMD_x86_64
 #  undef __DECL_SIMD_cosf