PowerPC: modf optimization

This patch implements modf/modff optimization for POWER by focus
on FP operations instead of relying in integer ones.
This commit is contained in:
Adhemerval Zanella 2013-03-25 16:10:06 -05:00
parent ff491d14a2
commit 3c0265394d
7 changed files with 160 additions and 1 deletions

View File

@ -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]

View File

@ -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

39
benchtests/bench-modf.c Normal file
View File

@ -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"

View File

@ -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

View File

@ -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)

View File

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

View File

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