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Add optimized nearbyint{,f} for x86-64

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Ulrich Drepper 2011-10-18 09:13:23 -04:00
parent d38f1dba00
commit 581d30e386
7 changed files with 114 additions and 1 deletions
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9
ChangeLog
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@ -1,5 +1,14 @@
2011-10-18 Ulrich Drepper <drepper@gmail.com>
* sysdeps/x86_64/fpu/multiarch/Makefile [math] (libm-sysdep-routines):
Add s_nearbyint-c and s_nearbyintf-c.
* sysdeps/x86_64/fpu/bits/mathinline.h: Define nearbyint and
nearbyintf inlines.
* sysdeps/x86_64/fpu/multiarch/s_nearbyint-c.c: New file.
* sysdeps/x86_64/fpu/multiarch/s_nearbyint.S: New file.
* sysdeps/x86_64/fpu/multiarch/s_nearbyintf-c.c: New file.
* sysdeps/x86_64/fpu/multiarch/s_nearbyintf.S: New file.
* math/math_private.h: Define defaults for libc_fegetround,
libc_fegetroundf, libc_fegetroundl, libc_fesetround, libc_fesetroundf,
libc_fesetroundl, libc_feholdexcept, libc_feholdexceptf,

18
sysdeps/x86_64/fpu/bits/mathinline.h
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@ -167,6 +167,24 @@ __NTH (rintf (float __x))
return __res;
}
#ifdef __USE_ISOC99
/* Round to nearest integer without raising inexact exception. */
__MATH_INLINE double
__NTH (nearbyint (double __x))
{
double __res;
__asm ("roundsd $0xc, %1, %0" : "=x" (__res) : "xm" (__x));
return __res;
}
__MATH_INLINE float
__NTH (nearbyintf (float __x))
{
float __res;
__asm ("roundss $0xc, %1, %0" : "=x" (__res) : "xm" (__x));
return __res;
}
#endif
__END_NAMESPACE_C99
# endif

2
sysdeps/x86_64/fpu/multiarch/Makefile
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@ -1,4 +1,4 @@
ifeq ($(subdir),math)
libm-sysdep_routines += s_floor-c s_ceil-c s_floorf-c s_ceilf-c \
s_rint-c s_rintf-c
s_rint-c s_rintf-c s_nearbyint-c s_nearbyintf-c
endif

3
sysdeps/x86_64/fpu/multiarch/s_nearbyint-c.c Normal file
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@ -0,0 +1,3 @@
#undef __nearbyint
#define __nearbyint __nearbyint_c
#include <sysdeps/ieee754/dbl-64/wordsize-64/s_nearbyint.c>

40
sysdeps/x86_64/fpu/multiarch/s_nearbyint.S Normal file
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@ -0,0 +1,40 @@
/* Copyright (C) 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gmail.come>, 2011.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <machine/asm.h>
#include <init-arch.h>
ENTRY(__nearbyint)
.type __nearbyint, @gnu_indirect_function
call __get_cpu_features@plt
movq %rax, %rdx
leaq __nearbyint_sse41(%rip), %rax
testl $bit_SSE4_1, CPUID_OFFSET+index_SSE4_1(%rdx)
jnz 2f
leaq __nearbyint_c(%rip), %rax
2: ret
END(__nearbyint)
weak_alias (__nearbyint, nearbyint)
ENTRY(__nearbyint_sse41)
roundsd $0xc, %xmm0, %xmm0
ret
END(__nearbyint_sse41)

3
sysdeps/x86_64/fpu/multiarch/s_nearbyintf-c.c Normal file
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@ -0,0 +1,3 @@
#undef __nearbyintf
#define __nearbyintf __nearbyintf_c
#include <sysdeps/ieee754/flt-32/s_nearbyintf.c>

40
sysdeps/x86_64/fpu/multiarch/s_nearbyintf.S Normal file
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@ -0,0 +1,40 @@
/* Copyright (C) 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gmail.come>, 2011.
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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <machine/asm.h>
#include <init-arch.h>
ENTRY(__nearbyintf)
.type __nearbyintf, @gnu_indirect_function
call __get_cpu_features@plt
movq %rax, %rdx
leaq __nearbyintf_sse41(%rip), %rax
testl $bit_SSE4_1, CPUID_OFFSET+index_SSE4_1(%rdx)
jnz 2f
leaq __nearbyintf_c(%rip), %rax
2: ret
END(__nearbyintf)
weak_alias (__nearbyintf, nearbyintf)
ENTRY(__nearbyintf_sse41)
roundss $0xc, %xmm0, %xmm0
ret
END(__nearbyintf_sse41)