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96d6fd6c40
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.
41 lines
1.3 KiB
ArmAsm
41 lines
1.3 KiB
ArmAsm
/* Optimized stpcpy implementation for POWER8/PPC64.
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Copyright (C) 2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#undef EALIGN
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#define EALIGN(name, alignt, words) \
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.section ".text"; \
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ENTRY_2(__stpcpy_power8) \
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.align ALIGNARG(alignt); \
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EALIGN_W_##words; \
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BODY_LABEL(__stpcpy_power8): \
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cfi_startproc; \
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LOCALENTRY(__stpcpy_power8)
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#undef END
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#define END(name) \
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cfi_endproc; \
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TRACEBACK(__stpcpy_power8) \
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END_2(__stpcpy_power8)
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#undef libc_hidden_builtin_def
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#define libc_hidden_builtin_def(name)
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#include <sysdeps/powerpc/powerpc64/power8/stpcpy.S>
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