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ARM: Optimize IEEE-754 sqrt implementation 

Use the vsqrt.f64 and vsqrt.f32 instructions if available.
This commit is contained in:
Sebastian Huber 2017-03-21 08:49:00 +01:00 committed by Corinna Vinschen
parent 33297d810d
commit baf32fb85f
4 changed files with 108 additions and 1 deletions
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2
newlib/libm/machine/arm/Makefile.am
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@ -6,6 +6,8 @@ INCLUDES = -I $(newlib_basedir)/../newlib/libm/common $(NEWLIB_CFLAGS) \
$(CROSS_CFLAGS) $(TARGET_CFLAGS)
LIB_SOURCES = \
e_sqrt.c \
ef_sqrt.c \
s_ceil.c \
s_floor.c \
s_nearbyint.c \

17
newlib/libm/machine/arm/Makefile.in
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@ -70,7 +70,8 @@ LIBRARIES = $(noinst_LIBRARIES)
ARFLAGS = cru
lib_a_AR = $(AR) $(ARFLAGS)
lib_a_LIBADD =
am__objects_1 = lib_a-s_ceil.$(OBJEXT) lib_a-s_floor.$(OBJEXT) \
am__objects_1 = lib_a-e_sqrt.$(OBJEXT) lib_a-ef_sqrt.$(OBJEXT) \
lib_a-s_ceil.$(OBJEXT) lib_a-s_floor.$(OBJEXT) \
lib_a-s_nearbyint.$(OBJEXT) lib_a-s_rint.$(OBJEXT) \
lib_a-s_round.$(OBJEXT) lib_a-s_trunc.$(OBJEXT) \
lib_a-sf_ceil.$(OBJEXT) lib_a-sf_floor.$(OBJEXT) \
@ -202,6 +203,8 @@ INCLUDES = -I $(newlib_basedir)/../newlib/libm/common $(NEWLIB_CFLAGS) \
$(CROSS_CFLAGS) $(TARGET_CFLAGS)
LIB_SOURCES = \
e_sqrt.c \
ef_sqrt.c \
s_ceil.c \
s_floor.c \
s_nearbyint.c \
@ -291,6 +294,18 @@ distclean-compile:
.c.obj:
$(COMPILE) -c `$(CYGPATH_W) '$<'`
lib_a-e_sqrt.o: e_sqrt.c
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-e_sqrt.o `test -f 'e_sqrt.c' || echo '$(srcdir)/'`e_sqrt.c
lib_a-e_sqrt.obj: e_sqrt.c
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-e_sqrt.obj `if test -f 'e_sqrt.c'; then $(CYGPATH_W) 'e_sqrt.c'; else $(CYGPATH_W) '$(srcdir)/e_sqrt.c'; fi`
lib_a-ef_sqrt.o: ef_sqrt.c
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-ef_sqrt.o `test -f 'ef_sqrt.c' || echo '$(srcdir)/'`ef_sqrt.c
lib_a-ef_sqrt.obj: ef_sqrt.c
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-ef_sqrt.obj `if test -f 'ef_sqrt.c'; then $(CYGPATH_W) 'ef_sqrt.c'; else $(CYGPATH_W) '$(srcdir)/ef_sqrt.c'; fi`
lib_a-s_ceil.o: s_ceil.c
$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-s_ceil.o `test -f 's_ceil.c' || echo '$(srcdir)/'`s_ceil.c

45
newlib/libm/machine/arm/e_sqrt.c Normal file
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@ -0,0 +1,45 @@
/*-
* Copyright (c) 2017 embedded brains GmbH
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if __ARM_FP & 0x8
#include <math.h>
double
__ieee754_sqrt(double x)
{
double result;
#if __ARM_ARCH >= 6
asm ("vsqrt.f64 %P0, %P1" : "=w" (result) : "w" (x));
#else
/* VFP9 Erratum 760019, see GCC sources "gcc/config/arm/vfp.md" */
asm ("vsqrt.f64 %P0, %P1" : "=&w" (result) : "w" (x));
#endif
return result;
}
#else
#include "../../math/e_sqrt.c"
#endif

45
newlib/libm/machine/arm/ef_sqrt.c Normal file
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@ -0,0 +1,45 @@
/*-
* Copyright (c) 2017 embedded brains GmbH
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if __ARM_FP & 0x4
#include <math.h>
float
__ieee754_sqrtf(float x)
{
float result;
#if __ARM_ARCH >= 6
asm ("vsqrt.f32 %0, %1" : "=w" (result) : "w" (x));
#else
/* VFP9 Erratum 760019, see GCC sources "gcc/config/arm/vfp.md" */
asm ("vsqrt.f32 %0, %1" : "=&w" (result) : "w" (x));
#endif
return result;
}
#else
#include "../../math/ef_sqrt.c"
#endif