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authorAdhemerval Zanella <azanella@linux.vnet.ibm.com>2014-12-23 05:59:44 -0600
committerAdhemerval Zanella <azanella@linux.vnet.ibm.com>2015-01-13 11:28:30 -0500
commit96d6fd6c4060d739abb1822e7ad633af749532b2 (patch)
tree3958c551f6b4e375b62cf08e3e30fd472a94acf7 /sysdeps/powerpc/powerpc64/multiarch/stpcpy-power8.S
parent0f9e585480edcdf1e30dc3d79e24b84aeee516fa (diff)
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powerpc: Optimized st{r,p}cpy for POWER8/PPC64
This patch adds an optimized POWER8 strcpy using unaligned accesses. For strings up to 16 bytes the implementation first calculate the string size, like strlen, and issues a memcpy. For larger strings, source is first aligned to 16 bytes and then tested over a loop that reads 16 bytes am combine the cmpb results for speedup. Special case is added for page cross reads. It shows 30%-60% improvement over the optimized POWER7 one that uses only aligned accesses.
Diffstat (limited to 'sysdeps/powerpc/powerpc64/multiarch/stpcpy-power8.S')
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1 files changed, 40 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/multiarch/stpcpy-power8.S b/sysdeps/powerpc/powerpc64/multiarch/stpcpy-power8.S
new file mode 100644
index 0000000000..66e6f708bd
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/stpcpy-power8.S
@@ -0,0 +1,40 @@
+/* Optimized stpcpy implementation for POWER8/PPC64.
+ Copyright (C) 2015 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/>. */
+
+#include <sysdep.h>
+
+#undef EALIGN
+#define EALIGN(name, alignt, words) \
+ .section ".text"; \
+ ENTRY_2(__stpcpy_power8) \
+ .align ALIGNARG(alignt); \
+ EALIGN_W_##words; \
+ BODY_LABEL(__stpcpy_power8): \
+ cfi_startproc; \
+ LOCALENTRY(__stpcpy_power8)
+
+#undef END
+#define END(name) \
+ cfi_endproc; \
+ TRACEBACK(__stpcpy_power8) \
+ END_2(__stpcpy_power8)
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
+#include <sysdeps/powerpc/powerpc64/power8/stpcpy.S>