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arm: Use sqrt{f} builtin

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Checked on arm-linux-gnueabi and armv7-linux-gnueabihf
This commit is contained in:
Adhemerval Zanella 2020-06-05 15:08:44 +00:00
parent 9dbb3fdfb7
commit cbf3571f49
3 changed files with 9 additions and 92 deletions
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46
sysdeps/arm/e_sqrt.c
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@ -1,46 +0,0 @@
/* Compute square root for double. ARM version.
Copyright (C) 2016-2020 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
<https://www.gnu.org/licenses/>. */
#ifdef __SOFTFP__
/* Use architecture-indendent sqrt implementation. */
# include <sysdeps/ieee754/dbl-64/e_sqrt.c>
#else
/* Use VFP square root instruction. */
# include <math.h>
# include <sysdep.h>
# include <libm-alias-finite.h>
double
__ieee754_sqrt (double x)
{
double ret;
# if __ARM_ARCH >= 6
asm ("vsqrt.f64 %P0, %P1" : "=w" (ret) : "w" (x));
# else
/* As in GCC, for VFP9 Erratum 760019 avoid overwriting the
input. */
asm ("vsqrt.f64 %P0, %P1" : "=&w" (ret) : "w" (x));
# endif
return ret;
}
libm_alias_finite (__ieee754_sqrt, __sqrt)
#endif

46
sysdeps/arm/e_sqrtf.c
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/* Compute square root for float. ARM version.
Copyright (C) 2016-2020 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
<https://www.gnu.org/licenses/>. */
#ifdef __SOFTFP__
/* Use architecture-indendent sqrtf implementation. */
# include <sysdeps/ieee754/flt-32/e_sqrtf.c>
#else
/* Use VFP square root instruction. */
# include <math.h>
# include <sysdep.h>
# include <libm-alias-finite.h>
float
__ieee754_sqrtf (float x)
{
float ret;
# if __ARM_ARCH >= 6
asm ("vsqrt.f32 %0, %1" : "=t" (ret) : "t" (x));
# else
/* As in GCC, for VFP9 Erratum 760019 avoid overwriting the
input. */
asm ("vsqrt.f32 %0, %1" : "=&t" (ret) : "t" (x));
# endif
return ret;
}
libm_alias_finite (__ieee754_sqrtf, __sqrtf)
#endif

9
sysdeps/arm/math-use-builtins-sqrt.h Normal file
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#ifdef __SOFTFP__
# define USE_SQRT_BUILTIN 0
# define USE_SQRTF_BUILTIN 0
#else
# define USE_SQRT_BUILTIN 1
# define USE_SQRTF_BUILTIN 1
#endif
#define USE_SQRTL_BUILTIN 0
#define USE_SQRTF128_BUILTIN 0