PowerPC: modf optimization

This patch implements modf/modff optimization for POWER by focus
on FP operations instead of relying in integer ones.

ChangeLog

@@ -1,3 +1,15 @@
+2013-04-23  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>
+
+	* sysdeps/powerpc/power5/fpu/s_modf.c: New file: modf optimization for
+	POWER.
+	* sysdeps/powerpc/power5/fpu/s_modff.c: New file: modff optimization
+	for POWER.
+	* sysdeps/powerpc/powerpc64/power5/Implies: Add powerpc/power5 and
+	powerpc/power5/fpu folders.
+	* sysdeps/powerpc/powerpc32/power5/Implies: Likewise.
+	* benchtests/Makefile: Add modf testcase.
+	* benchtests/bench-modf.c: New file: Benchmark test for mo
+
 2013-04-23  Siddhesh Poyarekar  <siddhesh@redhat.com>
 
 	[BZ #14888]

benchtests/Makefile

@@ -45,7 +45,7 @@
 #   See pow-inputs for an example.
 
 subdir := benchtests
-bench := exp pow rint sin cos tan atan \
+bench := exp pow rint sin cos tan atan modf \
 	 slowexp slowpow slowsin slowcos slowtan slowatan
 
 # exp function fast path

benchtests/bench-modf.c

@@ -0,0 +1,39 @@
+/* Copyright (C) 2013 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/>.  */
+
+extern double modf (double, double *);
+
+#define CALL_BENCH_FUNC(j, i) modf ( in[j].arg0, &i);
+
+struct args
+{
+  double arg0;
+} in[] =
+{
+  {  42.42 },
+  { -42.42 }
+};
+
+#define NUM_SAMPLES (sizeof (in) / sizeof (struct args))
+
+static volatile double ret = 0.0;
+#define BENCH_FUNC(j) ({double iptr; ret =  CALL_BENCH_FUNC (j, iptr);})
+
+#define ITER 250000000
+#define FUNCNAME "modf"
+
+#include "bench-skeleton.c"

sysdeps/powerpc/power5/fpu/s_modf.c

@@ -0,0 +1,58 @@
+/* Copyright (C) 2013 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#include <math.h>
+#include <math_private.h>
+#include <math_ldbl_opt.h>
+
+double
+__modf (double x, double *iptr)
+{
+  if (__builtin_isinf (x))
+    {
+      *iptr = x;
+      return __copysign (0.0, x);
+    }
+  else if (__builtin_isnan (x))
+    {
+      *iptr = NAN;
+      return NAN;
+    }
+
+  if (x >= 0.0)
+    {
+      *iptr = __floor (x);
+      return (x - *iptr);
+    }
+  else
+    {
+      *iptr = __ceil (x);
+      return (x - *iptr);
+    }
+}
+weak_alias (__modf, modf)
+#ifdef NO_LONG_DOUBLE
+strong_alias (__modf, __modfl)
+weak_alias (__modf, modfl)
+#endif
+#ifdef IS_IN_libm
+# if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
+compat_symbol (libm, __modf, modfl, GLIBC_2_0);
+# endif
+#elif LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
+compat_symbol (libc, __modf, modfl, GLIBC_2_0);
+#endif

sysdeps/powerpc/power5/fpu/s_modff.c

@@ -0,0 +1,46 @@
+/* Copyright (C) 2013 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#include <math.h>
+#include <math_private.h>
+
+float
+__modff (float x, float *iptr)
+{
+  if (__builtin_isinff (x))
+    {
+      *iptr = x;
+      return __copysignf (0.0, x);
+    }
+  else if (__builtin_isnanf (x))
+    {
+      *iptr = NAN;
+      return NAN;
+    }
+
+  if (x >= 0.0)
+    {
+      *iptr = __floorf (x);
+      return (x - *iptr);
+    }
+  else
+    {
+      *iptr = __ceilf (x);
+      return (x - *iptr);
+    }
+}
+weak_alias (__modff, modff)

sysdeps/powerpc/powerpc32/power5/Implies

@@ -1,2 +1,4 @@
+powerpc/power5/fpu
+powerpc/power5
 powerpc/powerpc32/power4/fpu
 powerpc/powerpc32/power4

sysdeps/powerpc/powerpc64/power5/Implies

@@ -1,2 +1,4 @@
+powerpc/power5/fpu
+powerpc/power5
 powerpc/powerpc64/power4/fpu
 powerpc/powerpc64/power4