Trigonometric optimizations for POWER

1 files changed, 53 insertions, 0 deletions

diff --git a/sysdeps/powerpc/fpu/k_sinf.c b/sysdeps/powerpc/fpu/k_sinf.c
new file mode 100644
index 0000000000..f93a478712
--- /dev/null
+++ b/sysdeps/powerpc/fpu/k_sinf.c
@@ -0,0 +1,53 @@
+/* k_sinf.c -- float version of k_sin.c
+   Copyright (C) 2011 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Adhemerval Zanella <azanella@br.ibm.com>, 2011
+
+   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,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include "math.h"
+#include "math_private.h"
+
+
+static const float twom27 =  7.4505806000e-09;
+static const float half   =  5.0000000000e-01;
+static const float S1     = -1.6666667163e-01;
+static const float S2     =  8.3333337680e-03;
+static const float S3     = -1.9841270114e-04;
+static const float S4     =  2.7557314297e-06;
+static const float S5     = -2.5050759689e-08;
+static const float S6     =  1.5896910177e-10;
+
+
+float
+__kernel_sinf (float x, float y, int iy)
+{
+  float z, r, v;
+  float ix;
+  ix = __builtin_fabsf (x);
+  if (ix < twom27)
+    {				/* |x| < 2**-27 */
+      if (x == 0.0)
+	return x;
+    }
+  z = x * x;
+  v = z * x;
+  r = S2 + z * (S3 + z * (S4 + z * (S5 + z * S6)));
+  if (iy == 0)
+    return x + v * (S1 + z * r);
+  else
+    return x - ((z * (half * y - v * r) - y) - v * S1);
+}