GNU C Library master sources branch master updated. glibc-2.24-281-g0f04fc0

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=0f04fc07f6a36e761ec76100043798ea5c7a590c

commit 0f04fc07f6a36e761ec76100043798ea5c7a590c
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Thu Oct 20 23:24:44 2016 +0000

    Use VSQRT instruction for ARM sqrt (bug 20660).
    
    This patch makes ARM sqrt and sqrtf use the VSQRT VFP square root
    instruction when available, instead of much larger generic code for
    computing square roots.
    
    Now, GCC will normally inline sqrt calls except for negative arguments
    where errno needs to be set, and because the benchtests fail to use
    -fno-builtin that means no significant difference in benchmark results
    for sqrt (note, however, there are lots of __ieee754_sqrt calls
    internally in libm, which are *not* inlined - although some
    architectures define __ieee754_sqrt in their math_private.h for that
    purpose, ARM doesn't - so improving out-of-line sqrt performance is
    still relevant to those other functions, if not for most ordinary
    direct users of sqrt).  With the benchtests changed to use
    -fno-builtin for sqrt tests, typical performance results before the
    change are ("max" is wildly varying in any case):
    
        "duration": 9.88358e+09,
        "iterations": 4.8783e+07,
        "max": 457.764,
        "min": 183.105,
        "mean": 202.603
    
    and after it are:
    
        "duration": 9.45663e+09,
        "iterations": 2.24385e+08,
        "max": 274.659,
        "min": 30.517,
        "mean": 42.1447
    
    Tested for ARM (hard-float and soft-float).
    
    	[BZ #20660]
    	* sysdeps/arm/e_sqrt.c: New file.
    	* sysdeps/arm/e_sqrtf.c: Likewise.

diff --git a/ChangeLog b/ChangeLog
index 49436bc..ef710b4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2016-10-20  Joseph Myers  <joseph@codesourcery.com>
+
+	[BZ #20660]
+	* sysdeps/arm/e_sqrt.c: New file.
+	* sysdeps/arm/e_sqrtf.c: Likewise.
+
 2016-10-19  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #20718]
diff --git a/sysdeps/arm/e_sqrt.c b/sysdeps/arm/e_sqrt.c
new file mode 100644
index 0000000..8ba85ed
--- /dev/null
+++ b/sysdeps/arm/e_sqrt.c
@@ -0,0 +1,45 @@
+/* Compute square root for double.  ARM version.
+   Copyright (C) 2016 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/>.  */
+
+#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>
+
+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;
+}
+strong_alias (__ieee754_sqrt, __sqrt_finite)
+
+#endif
diff --git a/sysdeps/arm/e_sqrtf.c b/sysdeps/arm/e_sqrtf.c
new file mode 100644
index 0000000..282f7c3
--- /dev/null
+++ b/sysdeps/arm/e_sqrtf.c
@@ -0,0 +1,45 @@
+/* Compute square root for float.  ARM version.
+   Copyright (C) 2016 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/>.  */
+
+#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>
+
+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;
+}
+strong_alias (__ieee754_sqrtf, __sqrtf_finite)
+
+#endif

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                               |    6 +++++
 sysdeps/{sparc/sparc32 => arm}/e_sqrt.c |   32 +++++++++++++++++++++---------
 sysdeps/{x86_64/fpu => arm}/e_sqrtf.c   |   32 ++++++++++++++++++++++--------
 3 files changed, 51 insertions(+), 19 deletions(-)
 copy sysdeps/{sparc/sparc32 => arm}/e_sqrt.c (59%)
 copy sysdeps/{x86_64/fpu => arm}/e_sqrtf.c (59%)


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