PowerPC: modf optimization

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

2 files changed, 40 insertions, 1 deletions

diff --git a/benchtests/Makefile b/benchtests/Makefile
index c61fd87..110c5d8 100644
--- a/benchtests/Makefile
+++ b/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
diff --git a/benchtests/bench-modf.c b/benchtests/bench-modf.c
new file mode 100644
index 0000000..975a29f
--- /dev/null
+++ b/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"