PATCH: Add 32bit FMA support

["H.J. Lu" <hongjiu dot lu at intel dot com>]

Hi,

This patch adds 32bit FMA support.


H.J.
---
2010-04-14  H.J. Lu  <hongjiu.lu@intel.com>

	* sysdeps/x86_64/elf/configure.in: Move AVX test to ....
	* sysdeps/i386/configure.in: Here.
	* sysdeps/i386/configure: Regenerated.
	* sysdeps/x86_64/elf/configure: Likewise.

	* sysdeps/i386/i686/multiarch/Makefile (libm-sysdep_routines): New.
	(CFLAGS-s_fma-fma.c): Likewise.
	(CFLAGS-s_fmaf-fma.c): Likewise.

	* sysdeps/i386/i686/multiarch/Versions: New.
	* sysdeps/i386/i686/multiarch/s_fma-fma.c: Likewise.
	* sysdeps/i386/i686/multiarch/s_fma.c: Likewise.
	* sysdeps/i386/i686/multiarch/s_fmaf-fma.c: Likewise.
	* sysdeps/i386/i686/multiarch/s_fmaf.c: Likewise.

diff --git a/sysdeps/i386/configure b/sysdeps/i386/configure
index 7814b3b..21225cd 100644
--- a/sysdeps/i386/configure
+++ b/sysdeps/i386/configure
@@ -656,3 +656,28 @@ fi
 fi
 { $as_echo "$as_me:$LINENO: result: $libc_cv_as_i686" >&5
 $as_echo "$libc_cv_as_i686" >&6; }
+
+{ $as_echo "$as_me:$LINENO: checking for AVX support" >&5
+$as_echo_n "checking for AVX support... " >&6; }
+if test "${libc_cv_cc_avx+set}" = set; then
+  $as_echo_n "(cached) " >&6
+else
+  if { ac_try='${CC-cc} -mavx -xc /dev/null -S -o /dev/null'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  libc_cv_cc_avx=yes
+else
+  libc_cv_cc_avx=no
+fi
+fi
+{ $as_echo "$as_me:$LINENO: result: $libc_cv_cc_avx" >&5
+$as_echo "$libc_cv_cc_avx" >&6; }
+if test $libc_cv_cc_avx = yes; then
+  cat >>confdefs.h <<\_ACEOF
+#define HAVE_AVX_SUPPORT 1
+_ACEOF
+
+fi
diff --git a/sysdeps/i386/configure.in b/sysdeps/i386/configure.in
index 9fc7fa5..d8dd648 100644
--- a/sysdeps/i386/configure.in
+++ b/sysdeps/i386/configure.in
@@ -55,3 +55,14 @@ if AC_TRY_COMMAND([${CC-cc} -Wa,-mtune=i686 -xc /dev/null -S -o /dev/null]); the
 else
   libc_cv_as_i686=no
 fi])
+
+dnl Check if -mavx works.
+AC_CACHE_CHECK(for AVX support, libc_cv_cc_avx, [dnl
+if AC_TRY_COMMAND([${CC-cc} -mavx -xc /dev/null -S -o /dev/null]); then
+  libc_cv_cc_avx=yes
+else
+  libc_cv_cc_avx=no
+fi])
+if test $libc_cv_cc_avx = yes; then
+  AC_DEFINE(HAVE_AVX_SUPPORT)
+fi
diff --git a/sysdeps/i386/i686/multiarch/Makefile b/sysdeps/i386/i686/multiarch/Makefile
index e8847d6..1245950 100644
--- a/sysdeps/i386/i686/multiarch/Makefile
+++ b/sysdeps/i386/i686/multiarch/Makefile
@@ -19,3 +19,9 @@ CFLAGS-strstr.c += -msse4
 CFLAGS-strcasestr.c += -msse4
 endif
 endif
+
+ifeq (mathyes,$(subdir)$(config-cflags-avx))
+libm-sysdep_routines += s_fma-fma s_fmaf-fma
+CFLAGS-s_fma-fma.c += -mavx -mfpmath=sse
+CFLAGS-s_fmaf-fma.c += -mavx -mfpmath=sse
+endif
diff --git a/sysdeps/i386/i686/multiarch/Versions b/sysdeps/i386/i686/multiarch/Versions
new file mode 100644
index 0000000..59b185a
--- /dev/null
+++ b/sysdeps/i386/i686/multiarch/Versions
@@ -0,0 +1,5 @@
+libc {
+  GLIBC_PRIVATE {
+    __get_cpu_features;
+  }
+}
diff --git a/sysdeps/i386/i686/multiarch/s_fma-fma.c b/sysdeps/i386/i686/multiarch/s_fma-fma.c
new file mode 100644
index 0000000..e6f77ae
--- /dev/null
+++ b/sysdeps/i386/i686/multiarch/s_fma-fma.c
@@ -0,0 +1,30 @@
+/* FMA version of fma.
+   Copyright (C) 2010 Free Software Foundation, Inc.
+   Contributed by Intel Corporation.
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA. */
+
+#include <config.h>
+
+#ifdef HAVE_AVX_SUPPORT
+double
+__fma_fma (double x, double y, double z)
+{
+  asm ("vfmadd213sd %3, %2, %0" : "=x" (x) : "0" (x), "x" (y), "xm" (z));
+  return x;
+}
+#endif
diff --git a/sysdeps/i386/i686/multiarch/s_fma.c b/sysdeps/i386/i686/multiarch/s_fma.c
new file mode 100644
index 0000000..d9291b0
--- /dev/null
+++ b/sysdeps/i386/i686/multiarch/s_fma.c
@@ -0,0 +1,36 @@
+/* Multiple versions of fma.
+   Copyright (C) 2010 Free Software Foundation, Inc.
+   Contributed by Intel Corporation.
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA. */
+
+#include <config.h>
+
+#ifdef HAVE_AVX_SUPPORT
+#include <math.h>
+#include <init-arch.h>
+
+extern double __fma_ia32 (double x, double y, double z) attribute_hidden;
+extern double __fma_fma (double x, double y, double z) attribute_hidden;
+
+libm_ifunc (__fma, HAS_FMA ? __fma_fma : __fma_ia32);
+weak_alias (__fma, fma)
+
+# define __fma __fma_ia32
+#endif
+
+#include <math/s_fma.c>
diff --git a/sysdeps/i386/i686/multiarch/s_fmaf-fma.c b/sysdeps/i386/i686/multiarch/s_fmaf-fma.c
new file mode 100644
index 0000000..887e9c3
--- /dev/null
+++ b/sysdeps/i386/i686/multiarch/s_fmaf-fma.c
@@ -0,0 +1,30 @@
+/* FMA version of fmaf.
+   Copyright (C) 2010 Free Software Foundation, Inc.
+   Contributed by Intel Corporation.
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA. */
+
+#include <config.h>
+
+#ifdef HAVE_AVX_SUPPORT
+float
+__fmaf_fma (float x, float y, float z)
+{
+  asm ("vfmadd213ss %3, %2, %0" : "=x" (x) : "0" (x), "x" (y), "xm" (z));
+  return x;
+}
+#endif
diff --git a/sysdeps/i386/i686/multiarch/s_fmaf.c b/sysdeps/i386/i686/multiarch/s_fmaf.c
new file mode 100644
index 0000000..4ea9be4
--- /dev/null
+++ b/sysdeps/i386/i686/multiarch/s_fmaf.c
@@ -0,0 +1,36 @@
+/* Multiple versions of fmaf.
+   Copyright (C) 2010 Free Software Foundation, Inc.
+   Contributed by Intel Corporation.
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA. */
+
+#include <config.h>
+
+#ifdef HAVE_AVX_SUPPORT
+#include <math.h>
+#include <init-arch.h>
+
+extern float __fmaf_ia32 (float x, float y, float z) attribute_hidden;
+extern float __fmaf_fma (float x, float y, float z) attribute_hidden;
+
+libm_ifunc (__fmaf, HAS_FMA ? __fmaf_fma : __fmaf_ia32);
+weak_alias (__fmaf, fmaf)
+
+# define __fmaf __fmaf_ia32
+#endif
+
+#include <math/s_fmaf.c>
diff --git a/sysdeps/x86_64/elf/configure b/sysdeps/x86_64/elf/configure
index 0b93b04..50cf2fc 100644
--- a/sysdeps/x86_64/elf/configure
+++ b/sysdeps/x86_64/elf/configure
@@ -47,28 +47,3 @@ cat >>confdefs.h <<\_ACEOF
 #define PI_STATIC_AND_HIDDEN 1
 _ACEOF
 
-
-{ $as_echo "$as_me:$LINENO: checking for AVX support" >&5
-$as_echo_n "checking for AVX support... " >&6; }
-if test "${libc_cv_cc_avx+set}" = set; then
-  $as_echo_n "(cached) " >&6
-else
-  if { ac_try='${CC-cc} -mavx -xc /dev/null -S -o /dev/null'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; }; then
-  libc_cv_cc_avx=yes
-else
-  libc_cv_cc_avx=no
-fi
-fi
-{ $as_echo "$as_me:$LINENO: result: $libc_cv_cc_avx" >&5
-$as_echo "$libc_cv_cc_avx" >&6; }
-if test $libc_cv_cc_avx = yes; then
-  cat >>confdefs.h <<\_ACEOF
-#define HAVE_AVX_SUPPORT 1
-_ACEOF
-
-fi
diff --git a/sysdeps/x86_64/elf/configure.in b/sysdeps/x86_64/elf/configure.in
index 14d1875..9cb59d0 100644
--- a/sysdeps/x86_64/elf/configure.in
+++ b/sysdeps/x86_64/elf/configure.in
@@ -32,14 +32,3 @@ fi
 dnl It is always possible to access static and hidden symbols in an
 dnl position independent way.
 AC_DEFINE(PI_STATIC_AND_HIDDEN)
-
-dnl Check if -mavx works.
-AC_CACHE_CHECK(for AVX support, libc_cv_cc_avx, [dnl
-if AC_TRY_COMMAND([${CC-cc} -mavx -xc /dev/null -S -o /dev/null]); then
-  libc_cv_cc_avx=yes
-else
-  libc_cv_cc_avx=no
-fi])
-if test $libc_cv_cc_avx = yes; then
-  AC_DEFINE(HAVE_AVX_SUPPORT)
-fi