Merge powerpc slowpow.c into generic code

6 files changed, 29 insertions, 186 deletions

diff --git a/ChangeLog b/ChangeLog
index 75841387ff..948e9330ed 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,15 @@
 2013-03-07  Siddhesh Poyarekar  <siddhesh@redhat.com>
 
+	* sysdeps/ieee754/dbl-64/slowpow.c [USE_LONG_DOUBLE_FOR_MP]
+	(__slowpow): Use long double EXPL and LOGL functions to
+	compute POW.
+	* sysdeps/powerpc/powerpc32/power4/fpu/Makefile
+	(CPPFLAGS-slowpow.c): Define USE_LONG_DOUBLE_FOR_MP.
+	* sysdeps/powerpc/powerpc32/power4/fpu/slowpow.c: Remove.
+	* sysdeps/powerpc/powerpc64/power4/fpu/Makefile
+	(CPPFLAGS-slowpow.c): Define USE_LONG_DOUBLE_FOR_MP.
+	* sysdeps/powerpc/powerpc64/power4/fpu/slowpow.c: Remove.
+
 	* sysdeps/powerpc/powerpc32/power4/fpu/mpa.c (__mul): Use
 	intermediate variable to calculate exponent.
 	(__sqr): Likewise.
diff --git a/sysdeps/ieee754/dbl-64/slowpow.c b/sysdeps/ieee754/dbl-64/slowpow.c
index cccc7e32c2..a379728b14 100644
--- a/sysdeps/ieee754/dbl-64/slowpow.c
+++ b/sysdeps/ieee754/dbl-64/slowpow.c
@@ -59,6 +59,23 @@ __slowpow (double x, double y, double z)
   if (res >= 0)
     return res;
 
+  /* Compute pow as long double.  This is currently only used by powerpc, where
+     one may get 106 bits of accuracy.  */
+#ifdef USE_LONG_DOUBLE_FOR_MP
+  long double ldw, ldz, ldpp;
+  static const long double ldeps = 0x4.0p-96;
+
+  ldz = __ieee754_logl ((long double) x);
+  ldw = (long double) y *ldz;
+  ldpp = __ieee754_expl (ldw);
+  res = (double) (ldpp + ldeps);
+  res1 = (double) (ldpp - ldeps);
+
+  /* Return the result if it is accurate enough.  */
+  if (res == res1)
+    return res;
+#endif
+
   /* Or else, calculate using multiple precision.  P = 10 implies accuracy of
      240 bits accuracy, since MP_NO has a radix of 2^24.  */
   p = 10;
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/Makefile b/sysdeps/powerpc/powerpc32/power4/fpu/Makefile
index f487ed6014..ded9976b9d 100644
--- a/sysdeps/powerpc/powerpc32/power4/fpu/Makefile
+++ b/sysdeps/powerpc/powerpc32/power4/fpu/Makefile
@@ -2,4 +2,5 @@
 
 ifeq ($(subdir),math)
 CFLAGS-mpa.c += --param max-unroll-times=4 -funroll-loops -fpeel-loops
+CPPFLAGS-slowpow.c += -DUSE_LONG_DOUBLE_FOR_MP=1
 endif
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/slowpow.c b/sysdeps/powerpc/powerpc32/power4/fpu/slowpow.c
deleted file mode 100644
index 7c97d95817..0000000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/slowpow.c
+++ /dev/null
@@ -1,93 +0,0 @@
-/*
- * IBM Accurate Mathematical Library
- * written by International Business Machines Corp.
- * Copyright (C) 2001-2013 Free Software Foundation, Inc.
- *
- * This program 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.
- *
- * This program 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 this program; if not, see <http://www.gnu.org/licenses/>.
- */
-/*************************************************************************/
-/* MODULE_NAME:slowpow.c                                                 */
-/*                                                                       */
-/* FUNCTION:slowpow                                                      */
-/*                                                                       */
-/*FILES NEEDED:mpa.h                                                     */
-/*             mpa.c mpexp.c mplog.c halfulp.c                           */
-/*                                                                       */
-/* Given two IEEE double machine numbers y,x , routine  computes the     */
-/* correctly  rounded (to nearest) value of x^y. Result calculated  by   */
-/* multiplication (in halfulp.c) or if result isn't accurate enough      */
-/* then routine converts x and y into multi-precision doubles and        */
-/* recompute.                                                            */
-/*************************************************************************/
-
-#include "mpa.h"
-#include <math_private.h>
-
-void __mpexp (mp_no * x, mp_no * y, int p);
-void __mplog (mp_no * x, mp_no * y, int p);
-double ulog (double);
-double __halfulp (double x, double y);
-
-double
-__slowpow (double x, double y, double z)
-{
-  double res, res1;
-  long double ldw, ldz, ldpp;
-  static const long double ldeps = 0x4.0p-96;
-
-  res = __halfulp (x, y);	/* halfulp() returns -10 or x^y             */
-  if (res >= 0)
-    return res;			/* if result was really computed by halfulp */
-  /*  else, if result was not really computed by halfulp */
-
-  /* Compute pow as long double, 106 bits */
-  ldz = __ieee754_logl ((long double) x);
-  ldw = (long double) y *ldz;
-  ldpp = __ieee754_expl (ldw);
-  res = (double) (ldpp + ldeps);
-  res1 = (double) (ldpp - ldeps);
-
-  if (res != res1)		/* if result still not accurate enough */
-    {				/* use mpa for higher precision.  */
-      mp_no mpx, mpy, mpz, mpw, mpp, mpr, mpr1;
-      static const mp_no eps = { -3, {1.0, 4.0} };
-      int p;
-
-      p = 10;			/*  p=precision 240 bits  */
-      __dbl_mp (x, &mpx, p);
-      __dbl_mp (y, &mpy, p);
-      __dbl_mp (z, &mpz, p);
-      __mplog (&mpx, &mpz, p);		/* log(x) = z   */
-      __mul (&mpy, &mpz, &mpw, p);	/*  y * z =w    */
-      __mpexp (&mpw, &mpp, p);		/*  e^w =pp     */
-      __add (&mpp, &eps, &mpr, p);	/*  pp+eps =r   */
-      __mp_dbl (&mpr, &res, p);
-      __sub (&mpp, &eps, &mpr1, p);	/*  pp -eps =r1 */
-      __mp_dbl (&mpr1, &res1, p);	/*  converting into double precision */
-      if (res == res1)
-	return res;
-
-      /* if we get here result wasn't calculated exactly, continue for
-         more exact calculation using 768 bits.  */
-      p = 32;
-      __dbl_mp (x, &mpx, p);
-      __dbl_mp (y, &mpy, p);
-      __dbl_mp (z, &mpz, p);
-      __mplog (&mpx, &mpz, p);		/* log(c)=z  */
-      __mul (&mpy, &mpz, &mpw, p);	/* y*z =w    */
-      __mpexp (&mpw, &mpp, p);		/* e^w=pp    */
-      __mp_dbl (&mpp, &res, p);		/* converting into double precision */
-    }
-  return res;
-}
diff --git a/sysdeps/powerpc/powerpc64/power4/fpu/Makefile b/sysdeps/powerpc/powerpc64/power4/fpu/Makefile
index f8bb3ef04b..41f255364f 100644
--- a/sysdeps/powerpc/powerpc64/power4/fpu/Makefile
+++ b/sysdeps/powerpc/powerpc64/power4/fpu/Makefile
@@ -2,4 +2,5 @@
 
 ifeq ($(subdir),math)
 CFLAGS-mpa.c += --param max-unroll-times=4 -funroll-loops -fpeel-loops
+CPPFLAGS-slowpow.c += -DUSE_LONG_DOUBLE_FOR_MP=1
 endif
diff --git a/sysdeps/powerpc/powerpc64/power4/fpu/slowpow.c b/sysdeps/powerpc/powerpc64/power4/fpu/slowpow.c
deleted file mode 100644
index 7c97d95817..0000000000
--- a/sysdeps/powerpc/powerpc64/power4/fpu/slowpow.c
+++ /dev/null
@@ -1,93 +0,0 @@
-/*
- * IBM Accurate Mathematical Library
- * written by International Business Machines Corp.
- * Copyright (C) 2001-2013 Free Software Foundation, Inc.
- *
- * This program 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.
- *
- * This program 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 this program; if not, see <http://www.gnu.org/licenses/>.
- */
-/*************************************************************************/
-/* MODULE_NAME:slowpow.c                                                 */
-/*                                                                       */
-/* FUNCTION:slowpow                                                      */
-/*                                                                       */
-/*FILES NEEDED:mpa.h                                                     */
-/*             mpa.c mpexp.c mplog.c halfulp.c                           */
-/*                                                                       */
-/* Given two IEEE double machine numbers y,x , routine  computes the     */
-/* correctly  rounded (to nearest) value of x^y. Result calculated  by   */
-/* multiplication (in halfulp.c) or if result isn't accurate enough      */
-/* then routine converts x and y into multi-precision doubles and        */
-/* recompute.                                                            */
-/*************************************************************************/
-
-#include "mpa.h"
-#include <math_private.h>
-
-void __mpexp (mp_no * x, mp_no * y, int p);
-void __mplog (mp_no * x, mp_no * y, int p);
-double ulog (double);
-double __halfulp (double x, double y);
-
-double
-__slowpow (double x, double y, double z)
-{
-  double res, res1;
-  long double ldw, ldz, ldpp;
-  static const long double ldeps = 0x4.0p-96;
-
-  res = __halfulp (x, y);	/* halfulp() returns -10 or x^y             */
-  if (res >= 0)
-    return res;			/* if result was really computed by halfulp */
-  /*  else, if result was not really computed by halfulp */
-
-  /* Compute pow as long double, 106 bits */
-  ldz = __ieee754_logl ((long double) x);
-  ldw = (long double) y *ldz;
-  ldpp = __ieee754_expl (ldw);
-  res = (double) (ldpp + ldeps);
-  res1 = (double) (ldpp - ldeps);
-
-  if (res != res1)		/* if result still not accurate enough */
-    {				/* use mpa for higher precision.  */
-      mp_no mpx, mpy, mpz, mpw, mpp, mpr, mpr1;
-      static const mp_no eps = { -3, {1.0, 4.0} };
-      int p;
-
-      p = 10;			/*  p=precision 240 bits  */
-      __dbl_mp (x, &mpx, p);
-      __dbl_mp (y, &mpy, p);
-      __dbl_mp (z, &mpz, p);
-      __mplog (&mpx, &mpz, p);		/* log(x) = z   */
-      __mul (&mpy, &mpz, &mpw, p);	/*  y * z =w    */
-      __mpexp (&mpw, &mpp, p);		/*  e^w =pp     */
-      __add (&mpp, &eps, &mpr, p);	/*  pp+eps =r   */
-      __mp_dbl (&mpr, &res, p);
-      __sub (&mpp, &eps, &mpr1, p);	/*  pp -eps =r1 */
-      __mp_dbl (&mpr1, &res1, p);	/*  converting into double precision */
-      if (res == res1)
-	return res;
-
-      /* if we get here result wasn't calculated exactly, continue for
-         more exact calculation using 768 bits.  */
-      p = 32;
-      __dbl_mp (x, &mpx, p);
-      __dbl_mp (y, &mpy, p);
-      __dbl_mp (z, &mpz, p);
-      __mplog (&mpx, &mpz, p);		/* log(c)=z  */
-      __mul (&mpy, &mpz, &mpw, p);	/* y*z =w    */
-      __mpexp (&mpw, &mpp, p);		/* e^w=pp    */
-      __mp_dbl (&mpp, &res, p);		/* converting into double precision */
-    }
-  return res;
-}