Add support for x86-64 fma instruction.

Use it to implement fma and fmaf, if possible.

3 files changed, 90 insertions, 0 deletions

diff --git a/sysdeps/x86_64/multiarch/Versions b/sysdeps/x86_64/multiarch/Versions
new file mode 100644
index 0000000000..59b185ac8d
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/Versions
@@ -0,0 +1,5 @@
+libc {
+  GLIBC_PRIVATE {
+    __get_cpu_features;
+  }
+}
diff --git a/sysdeps/x86_64/multiarch/s_fma.c b/sysdeps/x86_64/multiarch/s_fma.c
new file mode 100644
index 0000000000..40601e9a68
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/s_fma.c
@@ -0,0 +1,43 @@
+/* FMA version of fma.
+   Copyright (C) 2009 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>
+#include <math.h>
+#include <init-arch.h>
+
+#ifdef HAVE_AVX_SUPPORT
+
+extern double __fma_sse2 (double x, double y, double z);
+
+
+double
+__fma_fma (double x, double y, double z)
+{
+  asm ("vfmadd213sd %3, %2, %0" : "=x" (x) : "0" (x), "x" (y), "xm" (z));
+  return x;
+}
+
+libm_ifunc (__fma, HAS_FMA ? __fma_fma : __fma_sse2);
+weak_alias (__fma, fma)
+
+# define __fma __fma_sse2
+#endif
+
+#include <math/s_fma.c>
diff --git a/sysdeps/x86_64/multiarch/s_fmaf.c b/sysdeps/x86_64/multiarch/s_fmaf.c
new file mode 100644
index 0000000000..f3d37f8f4a
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/s_fmaf.c
@@ -0,0 +1,42 @@
+/* FMA version of fmaf.
+   Copyright (C) 2009 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA. */
+
+#include <config.h>
+#include <math.h>
+#include <init-arch.h>
+
+#ifdef HAVE_AVX_SUPPORT
+
+extern float __fmaf_sse2 (float x, float y, float z);
+
+
+float
+__fmaf_fma (float x, float y, float z)
+{
+  asm ("vfmadd213ss %3, %2, %0" : "=x" (x) : "0" (x), "x" (y), "xm" (z));
+  return x;
+}
+
+libm_ifunc (__fmaf, HAS_FMA ? __fmaf_fma : __fmaf_sse2);
+weak_alias (__fmaf, fmaf)
+
+# define __fmaf __fmaf_sse2
+#endif
+
+#include <math/s_fmaf.c>