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PowerPC: llround/llroundf POWER8 optimization

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This patch add a optimized llround/llroundf implementation for POWER8
using the new Move From VSR Doubleword instruction to gains some
cycles from FP to GRP register move.
This commit is contained in:
Adhemerval Zanella 2014-02-17 10:44:08 -06:00
parent 1ad8950a3e
commit fe13a20c37
5 changed files with 97 additions and 5 deletions
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11
ChangeLog
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@ -1,3 +1,14 @@
2014-02-27 Adhemerval Zanella <azanella@linux.vnet.ibm.com>
* sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile: Add llround power8
implementation.
* sysdeps/powerpc/powerpc64/fpu/multiarch/s_llround-power8.S: New file:
POWER8 llround ifunc implementation.
* sysdeps/powerpc/powerpc64/fpu/multiarch/s_llround.c (__lllround): Add
POWER8 implementation.
* sysdeps/powerpc/powerpc64/power8/fpu/s_llround.S: New file:
POWER8 llround implementation.
2014-02-27 Adhemerval Zanella <azanella@linux.vnet.ibm.com>
* sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile: Add llrint power8

2
sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
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@ -24,7 +24,7 @@ libm-sysdep_routines += s_isnan-power7 s_isnan-power6x s_isnan-power6 \
s_modff-power5+ s_modff-ppc64 e_hypot-ppc64 \
e_hypot-power7 e_hypotf-ppc64 e_hypotf-power7 \
s_isnan-power8 s_isinf-power8 s_finite-power8 \
s_llrint-power8
s_llrint-power8 s_llround-power8
CFLAGS-s_logbf-power7.c = -mcpu=power7
CFLAGS-s_logbl-power7.c = -mcpu=power7

31
sysdeps/powerpc/powerpc64/fpu/multiarch/s_llround-power8.S Normal file
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@ -0,0 +1,31 @@
/* llround(). PowerPC64 default version.
Copyright (C) 2014 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/>. */
#include <sysdep.h>
#include <math_ldbl_opt.h>
#undef weak_alias
#define weak_alias(name, alias)
#undef strong_alias
#define strong_alias(name, alias)
#undef compat_symbol
#define compat_symbol(lib, name, alias, ver)
#define __llround __llround_power8
#include <sysdeps/powerpc/powerpc64/power8/fpu/s_llround.S>

11
sysdeps/powerpc/powerpc64/fpu/multiarch/s_llround.c
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@ -27,12 +27,15 @@
extern __typeof (__llround) __llround_ppc64 attribute_hidden;
extern __typeof (__llround) __llround_power5plus attribute_hidden;
extern __typeof (__llround) __llround_power6x attribute_hidden;
extern __typeof (__llround) __llround_power8 attribute_hidden;
libc_ifunc (__llround,
(hwcap & PPC_FEATURE_POWER6_EXT)
? __llround_power6x :
(hwcap & PPC_FEATURE_POWER5_PLUS)
? __llround_power5plus
(hwcap2 & PPC_FEATURE2_ARCH_2_07)
? __llround_power8 :
(hwcap & PPC_FEATURE_POWER6_EXT)
? __llround_power6x :
(hwcap & PPC_FEATURE_POWER5_PLUS)
? __llround_power5plus
: __llround_ppc64);
weak_alias (__llround, llround)

47
sysdeps/powerpc/powerpc64/power8/fpu/s_llround.S Normal file
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@ -0,0 +1,47 @@
/* llround function. POWER8 PowerPC64 version.
Copyright (C) 2014 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/>. */
#include <sysdep.h>
#include <math_ldbl_opt.h>
#define MFVSRD_R3_V1 .byte 0x7c,0x23,0x00,0x66 /* mfvsrd r3,vs1 */
/* long long [r3] llround (float x [fp1]) */
ENTRY (__llround)
CALL_MCOUNT 0
frin fp1,fp1 /* Round to nearest +-0.5. */
fctidz fp1,fp1 /* Convert To Integer DW round toward 0. */
MFVSRD_R3_V1
blr
END (__llround)
strong_alias (__llround, __lround)
weak_alias (__llround, llround)
weak_alias (__lround, lround)
#ifdef NO_LONG_DOUBLE
weak_alias (__llround, llroundl)
strong_alias (__llround, __llroundl)
weak_alias (__lround, lroundl)
strong_alias (__lround, __lroundl)
#endif
#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1)
compat_symbol (libm, __llround, llroundl, GLIBC_2_1)
compat_symbol (libm, __lround, lroundl, GLIBC_2_1)
#endif