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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.
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Adhemerval Zanella
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Jan 13, 2015
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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/>. */ | ||
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| #include <sysdep.h> | ||
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| #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) | ||
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| #undef END | ||
| #define END(name) \ | ||
| cfi_endproc; \ | ||
| TRACEBACK(__stpcpy_power8) \ | ||
| END_2(__stpcpy_power8) | ||
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| #undef libc_hidden_builtin_def | ||
| #define libc_hidden_builtin_def(name) | ||
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| #include <sysdeps/powerpc/powerpc64/power8/stpcpy.S> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| /* Optimized strcpy 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/>. */ | ||
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| #include <sysdep.h> | ||
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| #undef EALIGN | ||
| #define EALIGN(name, alignt, words) \ | ||
| .section ".text"; \ | ||
| ENTRY_2(__strcpy_power8) \ | ||
| .align ALIGNARG(alignt); \ | ||
| EALIGN_W_##words; \ | ||
| BODY_LABEL(__strcpy_power8): \ | ||
| cfi_startproc; \ | ||
| LOCALENTRY(__strcpy_power8) | ||
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| #undef END | ||
| #define END(name) \ | ||
| cfi_endproc; \ | ||
| TRACEBACK(__strcpy_power8) \ | ||
| END_2(__strcpy_power8) | ||
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| #undef libc_hidden_builtin_def | ||
| #define libc_hidden_builtin_def(name) | ||
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| #include <sysdeps/powerpc/powerpc64/power8/strcpy.S> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| /* Optimized stpcpy implementation for PowerPC64/POWER8. | ||
| 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/>. */ | ||
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| #define USE_AS_STPCPY | ||
| #include <sysdeps/powerpc/powerpc64/power8/strcpy.S> | ||
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| weak_alias (__stpcpy, stpcpy) | ||
| libc_hidden_def (__stpcpy) | ||
| libc_hidden_builtin_def (stpcpy) |
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