[glibc] arm: Use sqrt{f} builtin

[glibc] arm: Use sqrt{f} builtin

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=cbf3571f49134388bc589b74445b5d6bdd21ef02

commit cbf3571f49134388bc589b74445b5d6bdd21ef02
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Fri Jun 5 15:08:44 2020 +0000

    arm: Use sqrt{f} builtin
    
    Checked on arm-linux-gnueabi and armv7-linux-gnueabihf

Diff:
---
 sysdeps/arm/e_sqrt.c                 | 46 ------------------------------------
 sysdeps/arm/e_sqrtf.c                | 46 ------------------------------------
 sysdeps/arm/math-use-builtins-sqrt.h |  9 +++++++
 3 files changed, 9 insertions(+), 92 deletions(-)

diff --git a/sysdeps/arm/e_sqrt.c b/sysdeps/arm/e_sqrt.c
deleted file mode 100644
index d264c4263b..0000000000
--- a/sysdeps/arm/e_sqrt.c
+++ /dev/null
@@ -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
diff --git a/sysdeps/arm/e_sqrtf.c b/sysdeps/arm/e_sqrtf.c
deleted file mode 100644
index c3f31119a3..0000000000
--- a/sysdeps/arm/e_sqrtf.c
+++ /dev/null
@@ -1,46 +0,0 @@
-/* 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
diff --git a/sysdeps/arm/math-use-builtins-sqrt.h b/sysdeps/arm/math-use-builtins-sqrt.h
new file mode 100644
index 0000000000..e765e7c49d
--- /dev/null
+++ b/sysdeps/arm/math-use-builtins-sqrt.h
@@ -0,0 +1,9 @@
+#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