sparc32/sparcv9: add a VIS3 version of fdim

sparc32 passes floating point values in the integer registers. VIS3
instructions gives access to the movwtos instruction to directly
transfer a value from an integer register to a floating point register.
Therefore it makes sense to provide a VIS3 version consisting in the
generic version compiled with -mvis3.

Changelog:
	* math/s_fdim.c: Avoid alias renamed.
	* math/s_fdimf.c: Likewise.
	* sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/Makefile
	[$(subdir) = math && $(have-as-vis3) = yes] (libm-sysdep_routines):
	Add s_fdimf-vis3, s_fdim-vis3.
	(CFLAGS-s_fdimf-vis3.c): New. Set to -Wa,-Av9d -mvis3.
	(CFLAGS-s_fdim-vis3.c): Likewise.
	sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdim-vis3.c: New file.
	sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdim.c: Likewise.

8 files changed, 131 insertions, 2 deletions

diff --git a/ChangeLog b/ChangeLog
index 3927bf7..d244dcc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,17 @@
 2016-08-05  Aurelien Jarno  <aurelien@aurel32.net>
 
+	* math/s_fdim.c: Avoid alias renamed.
+	* math/s_fdimf.c: Likewise.
+	* sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/Makefile
+	[$(subdir) = math && $(have-as-vis3) = yes] (libm-sysdep_routines):
+	Add s_fdimf-vis3, s_fdim-vis3.
+	(CFLAGS-s_fdimf-vis3.c): New. Set to -Wa,-Av9d -mvis3.
+	(CFLAGS-s_fdim-vis3.c): Likewise.
+	sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdim-vis3.c: New file.
+	sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdim.c: Likewise.
+
+2016-08-05  Aurelien Jarno  <aurelien@aurel32.net>
+
 	* sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/Makefile
 	[$(subdir) = math && $(have-as-vis3) = yes] (libm-sysdep_routines):
 	Remove s_fdimf-vis3, s_fdim-vis3.
diff --git a/math/s_fdim.c b/math/s_fdim.c
index a051ed8..1786521 100644
--- a/math/s_fdim.c
+++ b/math/s_fdim.c
@@ -33,8 +33,10 @@ __fdim (double x, double y)
 
   return r;
 }
+#ifndef __fdim
 weak_alias (__fdim, fdim)
-#ifdef NO_LONG_DOUBLE
+# ifdef NO_LONG_DOUBLE
 strong_alias (__fdim, __fdiml)
 weak_alias (__fdim, fdiml)
+# endif
 #endif
diff --git a/math/s_fdimf.c b/math/s_fdimf.c
index 8aed61d..e457f9d 100644
--- a/math/s_fdimf.c
+++ b/math/s_fdimf.c
@@ -33,4 +33,6 @@ __fdimf (float x, float y)
 
   return r;
 }
+#ifndef __fdimf
 weak_alias (__fdimf, fdimf)
+#endif
diff --git a/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/Makefile b/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/Makefile
index 13d3c6d..4489b70 100644
--- a/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/Makefile
+++ b/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/Makefile
@@ -5,7 +5,10 @@ libm-sysdep_routines += m_copysignf-vis3 m_copysign-vis3 s_fabs-vis3 \
 			s_rintf-vis3 s_rint-vis3 w_sqrt-vis3 w_sqrtf-vis3 \
 			s_fminf-vis3 s_fmin-vis3 s_fmaxf-vis3 s_fmax-vis3 \
 			s_fmaf-vis3 s_fma-vis3 s_nearbyint-vis3 \
-			s_nearbyintf-vis3
+			s_nearbyintf-vis3 s_fdimf-vis3 s_fdim-vis3
 sysdep_routines += s_copysignf-vis3 s_copysign-vis3
+
+CFLAGS-s_fdimf-vis3.c += -Wa,-Av9d -mvis3
+CFLAGS-s_fdim-vis3.c += -Wa,-Av9d -mvis3
 endif
 endif
diff --git a/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdim-vis3.c b/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdim-vis3.c
new file mode 100644
index 0000000..2973b49
--- /dev/null
+++ b/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdim-vis3.c
@@ -0,0 +1,23 @@
+/* Compute positive difference, sparc 32-bit+v9+vis3.
+   Copyright (C) 2016 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/>.  */
+
+#include <math.h>
+
+#define __fdim __fdim_vis3
+
+#include <math/s_fdim.c>
diff --git a/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdim.c b/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdim.c
new file mode 100644
index 0000000..c9c7704
--- /dev/null
+++ b/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdim.c
@@ -0,0 +1,32 @@
+/* Compute positive difference, sparc 32-bit.
+   Copyright (C) 2016 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/>.  */
+
+#ifdef HAVE_AS_VIS3_SUPPORT
+# include <sparc-ifunc.h>
+# include <math.h>
+
+extern double __fdim_vis3 (double, double);
+extern double __fdim_generic (double, double);
+
+sparc_libm_ifunc(__fdim, hwcap & HWCAP_SPARC_VIS3 ? __fdim_vis3 : __fdim_generic);
+weak_alias (__fdim, fdim)
+
+# define __fdim __fdim_generic
+#endif
+
+#include <math/s_fdim.c>
diff --git a/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdimf-vis3.c b/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdimf-vis3.c
new file mode 100644
index 0000000..75997c6
--- /dev/null
+++ b/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdimf-vis3.c
@@ -0,0 +1,23 @@
+/* Float compute positive difference, sparc 32-bit+v9+vis3.
+   Copyright (C) 2016 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/>.  */
+
+#include <math.h>
+
+#define __fdimf __fdimf_vis3
+
+#include <math/s_fdimf.c>
diff --git a/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdimf.c b/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdimf.c
new file mode 100644
index 0000000..767520f
--- /dev/null
+++ b/sysdeps/sparc/sparc32/sparcv9/fpu/multiarch/s_fdimf.c
@@ -0,0 +1,32 @@
+/* Float compute positive difference, sparc 32-bit.
+   Copyright (C) 2016 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/>.  */
+
+#ifdef HAVE_AS_VIS3_SUPPORT
+# include <sparc-ifunc.h>
+# include <math.h>
+
+extern float __fdimf_vis3 (float, float);
+extern float __fdimf_generic (float, float);
+
+sparc_libm_ifunc(__fdimf, hwcap & HWCAP_SPARC_VIS3 ? __fdimf_vis3 : __fdimf_generic);
+weak_alias (__fdimf, fdimf)
+
+# define __fdimf __fdimf_generic
+#endif
+
+#include <math/s_fdimf.c>