This patch adds infrastructure for addition of SIMD

declarations for math functions in math.h. Added new headers math-vector.h
(only generic version for now) and libm-simd-decl-stubs.h with empty
definitions required for proper unfolding of new macros __MATHCALL_VEC which
will be used for declaration of vector math functions.

2015-05-14  Andrew Senkevich  <andrew.senkevich@intel.com>

    * bits/math-vector.h: New file.
    * bits/libm-simd-decl-stubs.h: New header.
    * math/Makefile (headers): Added new header libm-simd-decl-stubs.h.
    * math/math.h (__MATHCALL_VEC): New macro.

ChangeLog

@@ -1,5 +1,11 @@
 2015-05-14  Andrew Senkevich  <andrew.senkevich@intel.com>
 
+	* bits/math-vector.h: New file.
+	* bits/libm-simd-decl-stubs.h: New header.
+	* math/Makefile (headers): Added new header
+	libm-simd-decl-stubs.h.
+	* math/math.h (__MATHCALL_VEC): New macro.
+
 	* math/gen-libm-have-vector-test.sh: Script generates series of macros
 	for conditions in testing functions.
 	* math/Makefile: Added call of libm-have-vector-test.sh.

bits/libm-simd-decl-stubs.h

@@ -0,0 +1,40 @@
+/* Empty definitions required for __MATHCALL_VEC unfolding in mathcalls.h.
+   Copyright (C) 2014-2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _MATH_H
+# error "Never include <bits/libm-simd-decl-stubs.h> directly;\
+ include <math.h> instead."
+#endif
+
+/* Needed definitions could be generated with:
+   for func in $(grep __MATHCALL_VEC math/bits/mathcalls.h |\
+		 sed -r "s|__MATHCALL_VEC.?\(||; s|,.*||"); do
+     echo "#define __DECL_SIMD_${func}";
+     echo "#define __DECL_SIMD_${func}f";
+     echo "#define __DECL_SIMD_${func}l";
+   done
+ */
+
+#ifndef _BITS_LIBM_SIMD_DECL_STUBS_H
+#define _BITS_LIBM_SIMD_DECL_STUBS_H 1
+
+#define __DECL_SIMD_cos
+#define __DECL_SIMD_cosf
+#define __DECL_SIMD_cosl
+
+#endif

bits/math-vector.h

@@ -0,0 +1,27 @@
+/* Platform-specific SIMD declarations of math functions.
+   Copyright (C) 2014-2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License  published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _MATH_H
+# error "Never include <bits/math-vector.h> directly;\
+ include <math.h> instead."
+#endif
+
+/* Get default empty definitions required for __MATHCALL_VEC unfolding.
+   Plaform-specific analogue of this header should redefine them with specific
+   SIMD declarations.  */
+#include <bits/libm-simd-decl-stubs.h>

math/Makefile

@@ -26,7 +26,8 @@ headers		:= math.h bits/mathcalls.h bits/mathinline.h bits/huge_val.h \
 		   bits/huge_valf.h bits/huge_vall.h bits/inf.h bits/nan.h \
 		   fpu_control.h complex.h bits/cmathcalls.h fenv.h \
 		   bits/fenv.h bits/fenvinline.h bits/mathdef.h tgmath.h \
-		   bits/math-finite.h
+		   bits/math-finite.h bits/math-vector.h \
+		   bits/libm-simd-decl-stubs.h
 
 # FPU support code.
 aux		:= setfpucw fpu_control

math/math.h

@@ -27,6 +27,9 @@
 
 __BEGIN_DECLS
 
+/* Get machine-dependent vector math functions declarations.  */
+#include <bits/math-vector.h>
+
 /* Get machine-dependent HUGE_VAL value (returned on overflow).
    On all IEEE754 machines, this is +Infinity.  */
 #include <bits/huge_val.h>
@@ -49,6 +52,12 @@ __BEGIN_DECLS
    so we can easily declare each function as both `name' and `__name',
    and can declare the float versions `namef' and `__namef'.  */
 
+#define __SIMD_DECL(function) __CONCAT (__DECL_SIMD_, function)
+
+#define __MATHCALL_VEC(function, suffix, args) 	\
+  __SIMD_DECL (__MATH_PRECNAME (function, suffix)) \
+  __MATHCALL (function, suffix, args)
+
 #define __MATHCALL(function,suffix, args)	\
   __MATHDECL (_Mdouble_,function,suffix, args)
 #define __MATHDECL(type, function,suffix, args) \