From f360f94a05570045be615649e9a411cefba2e210 Mon Sep 17 00:00:00 2001 From: Vidya Ranganathan Date: Mon, 5 May 2014 19:10:45 -0500 Subject: PowerPC: strncpy/stpncpy optimization for PPC64/POWER7 The optimization is achieved by following techniques: > data alignment [gain from aligned memory access on read/write] > POWER7 gains performance with loop unrolling/unwinding [gain by reduction of branch penalty]. > zero padding done by calling optimized memset --- sysdeps/powerpc/powerpc64/power7/stpncpy.S | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 sysdeps/powerpc/powerpc64/power7/stpncpy.S (limited to 'sysdeps/powerpc/powerpc64/power7/stpncpy.S') diff --git a/sysdeps/powerpc/powerpc64/power7/stpncpy.S b/sysdeps/powerpc/powerpc64/power7/stpncpy.S new file mode 100644 index 0000000000..a539093920 --- /dev/null +++ b/sysdeps/powerpc/powerpc64/power7/stpncpy.S @@ -0,0 +1,24 @@ +/* Optimized stpncpy implementation for PowerPC64/POWER7. + Copyright (C) 2014 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 + . */ + +#define USE_AS_STPNCPY +#include + +weak_alias (__stpncpy, stpncpy) +libc_hidden_def (__stpncpy) +libc_hidden_builtin_def (stpncpy) -- cgit v1.2.1