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PowerPC: Optimized isnan/isnanf for POWER8

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This patch add a optimized isnan/isnanf 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 2014-02-27 09:43:51 -06:00
parent 7d92b78723
commit 487972aea5
8 changed files with 128 additions and 17 deletions
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16
ChangeLog
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@ -1,3 +1,19 @@
2014-02-27 Adhemerval Zanella <azanella@linux.vnet.ibm.com>
* sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h (INIT_ARCH):
Add hwcap2 initialization.
* sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile: Add isnan power8
implementation.
* sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan-power8.S: New file:
POWER8 isnan ifunc implementation.
* sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan.c (__isnan): Add
POWER8 implementation.
* sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnanf.c (__isnanf):
Likewise.
* sysdeps/powerpc/powerpc64/power8/fpu/s_isnan.S: New file:
POWER8 isnan implementation.
* sysdeps/powerpc/powerpc64/power8/fpu/s_isnanf.S: New file.
2014-02-27 Joey Ye <joey.ye@arm.com>
* sysdeps/arm/soft-fp/sfp-machine.h (_FP_NANFRAC_S, _FP_NANFRAC_D)

1
sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h
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@ -36,6 +36,7 @@
and fills the previous ones. */
#define INIT_ARCH() \
unsigned long int hwcap = __GLRO(dl_hwcap); \
unsigned long int __attribute__((unused)) hwcap2 = __GLRO(dl_hwcap2); \
if (hwcap & PPC_FEATURE_ARCH_2_06) \
hwcap |= PPC_FEATURE_ARCH_2_05 | \
PPC_FEATURE_POWER5_PLUS | \

5
sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
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@ -4,7 +4,7 @@ sysdep_routines += s_isnan-power7 s_isnan-power6x s_isnan-power6 \
s_copysign-ppc64 s_finite-power7 s_finite-ppc64 \
s_finitef-ppc64 s_isinff-ppc64 s_isinf-power7 \
s_isinf-ppc64 s_modf-power5+ s_modf-ppc64 \
s_modff-power5+ s_modff-ppc64
s_modff-power5+ s_modff-ppc64 s_isnan-power8
libm-sysdep_routines += s_isnan-power7 s_isnan-power6x s_isnan-power6 \
s_isnan-power5 s_isnan-ppc64 s_llround-power6x \
@ -21,7 +21,8 @@ libm-sysdep_routines += s_isnan-power7 s_isnan-power6x s_isnan-power6 \
s_logbl-power7 s_logb-ppc64 s_logbf-ppc64 \
s_logbl-ppc64 s_modf-power5+ s_modf-ppc64 \
s_modff-power5+ s_modff-ppc64 e_hypot-ppc64 \
e_hypot-power7 e_hypotf-ppc64 e_hypotf-power7
e_hypot-power7 e_hypotf-ppc64 e_hypotf-power7 \
s_isnan-power8
CFLAGS-s_logbf-power7.c = -mcpu=power7
CFLAGS-s_logbl-power7.c = -mcpu=power7

33
sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan-power8.S Normal file
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@ -0,0 +1,33 @@
/* isnan(). PowerPC64/POWER7 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 hidden_def
#define hidden_def(name)
#undef weak_alias
#define weak_alias(name, alias)
#undef strong_alias
#define strong_alias(name, alias)
#undef compat_symbol
#define compat_symbol(lib, name, symbol, ver)
#define __isnan __isnan_power8
#include <sysdeps/powerpc/powerpc64/power8/fpu/s_isnan.S>

17
sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan.c
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@ -26,16 +26,19 @@ extern __typeof (__isnan) __isnan_power5 attribute_hidden;
extern __typeof (__isnan) __isnan_power6 attribute_hidden;
extern __typeof (__isnan) __isnan_power6x attribute_hidden;
extern __typeof (__isnan) __isnan_power7 attribute_hidden;
extern __typeof (__isnan) __isnan_power8 attribute_hidden;
libc_ifunc (__isnan,
(hwcap & PPC_FEATURE_ARCH_2_06)
? __isnan_power7 :
(hwcap & PPC_FEATURE_POWER6_EXT)
(hwcap2 & PPC_FEATURE2_ARCH_2_07)
? __isnan_power8 :
(hwcap & PPC_FEATURE_ARCH_2_06)
? __isnan_power7 :
(hwcap & PPC_FEATURE_POWER6_EXT)
? __isnan_power6x :
(hwcap & PPC_FEATURE_ARCH_2_05)
? __isnan_power6 :
(hwcap & PPC_FEATURE_POWER5)
? __isnan_power5
(hwcap & PPC_FEATURE_ARCH_2_05)
? __isnan_power6 :
(hwcap & PPC_FEATURE_POWER5)
? __isnan_power5
: __isnan_ppc64);
weak_alias (__isnan, isnan)

19
sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnanf.c
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@ -25,16 +25,19 @@ extern __typeof (__isnanf) __isnan_power5 attribute_hidden;
extern __typeof (__isnanf) __isnan_power6 attribute_hidden;
extern __typeof (__isnanf) __isnan_power6x attribute_hidden;
extern __typeof (__isnanf) __isnan_power7 attribute_hidden;
extern __typeof (__isnanf) __isnan_power8 attribute_hidden;
libc_ifunc (__isnanf,
(hwcap & PPC_FEATURE_ARCH_2_06)
? __isnan_power7 :
(hwcap & PPC_FEATURE_POWER6_EXT)
? __isnan_power6x :
(hwcap & PPC_FEATURE_ARCH_2_05)
? __isnan_power6 :
(hwcap & PPC_FEATURE_POWER5)
? __isnan_power5
(hwcap2 & PPC_FEATURE2_ARCH_2_07)
? __isnan_power8 :
(hwcap & PPC_FEATURE_ARCH_2_06)
? __isnan_power7 :
(hwcap & PPC_FEATURE_POWER6_EXT)
? __isnan_power6x :
(hwcap & PPC_FEATURE_ARCH_2_05)
? __isnan_power6 :
(hwcap & PPC_FEATURE_POWER5)
? __isnan_power5
: __isnan_ppc64);
weak_alias (__isnanf, isnanf)

53
sysdeps/powerpc/powerpc64/power8/fpu/s_isnan.S Normal file
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@ -0,0 +1,53 @@
/* isnan(). PowerPC64/POWER8 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 */
/* int [r3] __isnan([f1] x) */
EALIGN (__isnan, 4, 0)
CALL_MCOUNT 0
MFVSRD_R3_V1
lis r9,0x7ff0
clrldi r3,r3,1 /* r3 = r3 & 0x8000000000000000 */
rldicr r9,r9,32,31 /* r9 = (r9 << 32) & 0xffffffff */
subf r3,r3,r9
rldicl r3,r3,1,63
blr
END (__isnan)
/* It turns out that the 'double' version will also always work for
single-precision. */
strong_alias (__isnan, __isnanf)
hidden_def (__isnanf)
weak_alias (__isnanf, isnanf)
#ifdef NO_LONG_DOUBLE
strong_alias (__isnan, __isnanl)
weak_alias (__isnan, isnanl)
#endif
#ifndef IS_IN_libm
# if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
compat_symbol (libc, isnan, isnanl, GLIBC_2_0);
# endif
#endif

1
sysdeps/powerpc/powerpc64/power8/fpu/s_isnanf.S Normal file
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@ -0,0 +1 @@
/* This function uses the same code as s_isnan.S. */