| From 5db5f0071917cf14b454596f847fc7ff6e63e317 Mon Sep 17 00:00:00 2001 |
| From: Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> |
| Date: Wed, 24 Jun 2015 02:08:21 -0400 |
| Subject: [PATCH] powerpc: strstr optimization |
| |
| This patch optimizes strstr function for power >= 7 systems. Performance |
| gain is obtained using aligned memory access and usage of cmpb |
| instruction for quicker comparison. The average improvement of this |
| optimization is ~40%. Tested on ppc64 and ppc64le. |
| |
| 2015-07-16 Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> |
| |
| * sysdeps/powerpc/powerpc64/multiarch/Makefile: Add strstr(). |
| * sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c: Likewise. |
| * sysdeps/powerpc/powerpc64/power7/strstr.S: New File. |
| * sysdeps/powerpc/powerpc64/multiarch/strstr-power7.S: New File. |
| * sysdeps/powerpc/powerpc64/multiarch/strstr-ppc64.c: New File. |
| * sysdeps/powerpc/powerpc64/multiarch/strstr.c: New File. |
| |
| (cherry picked from commit b42f8cad52ebfbfd43ebf6e42e606b489ffbd466) |
| |
| ChangeLog | 10 + |
| sysdeps/powerpc/powerpc64/multiarch/Makefile | 2 +- |
| .../powerpc/powerpc64/multiarch/ifunc-impl-list.c | 9 + |
| .../powerpc/powerpc64/multiarch/strstr-power7.S | 44 ++ |
| sysdeps/powerpc/powerpc64/multiarch/strstr-ppc64.c | 29 ++ |
| sysdeps/powerpc/powerpc64/multiarch/strstr.c | 34 ++ |
| sysdeps/powerpc/powerpc64/power7/strstr.S | 509 +++++++++++++++++++++ |
| 7 files changed, 636 insertions(+), 1 deletion(-) |
| create mode 100644 sysdeps/powerpc/powerpc64/multiarch/strstr-power7.S |
| create mode 100644 sysdeps/powerpc/powerpc64/multiarch/strstr-ppc64.c |
| create mode 100644 sysdeps/powerpc/powerpc64/multiarch/strstr.c |
| create mode 100644 sysdeps/powerpc/powerpc64/power7/strstr.S |
| |
| diff --git a/ChangeLog b/ChangeLog |
| index 1aeb84b..8e98192 100644 |
| |
| diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile |
| index 17265bd..3b0e3a0 100644 |
| |
| |
| @@ -19,6 +19,7 @@ sysdep_routines += memcpy-power7 memcpy-a2 memcpy-power6 memcpy-cell \ |
| stpncpy-power8 stpncpy-power7 stpncpy-ppc64 \ |
| strncpy-power8 strncpy-power7 strncpy-ppc64 \ |
| strncat-power7 \ |
| + strstr-power7 strstr-ppc64 \ |
| rawmemchr-ppc64 strlen-power7 strlen-ppc64 strnlen-power7 \ |
| strnlen-ppc64 strcasecmp-power7 strcasecmp_l-power7 \ |
| strncase-power7 strncase_l-power7 \ |
| diff --git a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c |
| index f5fdea5..364385b 100644 |
| |
| |
| @@ -322,6 +322,14 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, |
| IFUNC_IMPL_ADD (array, i, strcat, 1, |
| __strcat_ppc)) |
| |
| + /* Support sysdeps/powerpc/powerpc64/multiarch/strstr.c. */ |
| + IFUNC_IMPL (i, name, strstr, |
| + IFUNC_IMPL_ADD (array, i, strstr, |
| + hwcap & PPC_FEATURE_HAS_VSX, |
| + __strstr_power7) |
| + IFUNC_IMPL_ADD (array, i, strstr, 1, |
| + __strstr_ppc)) |
| + |
| /* Support sysdeps/powerpc/powerpc64/multiarch/wcschr.c. */ |
| IFUNC_IMPL (i, name, wcschr, |
| IFUNC_IMPL_ADD (array, i, wcschr, |
| diff --git a/sysdeps/powerpc/powerpc64/multiarch/strstr-power7.S b/sysdeps/powerpc/powerpc64/multiarch/strstr-power7.S |
| new file mode 100644 |
| index 0000000..94ce95b |
| |
| |
| @@ -0,0 +1,44 @@ |
| +/* Optimized strstr implementation for POWER7. |
| + 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(__strstr_power7) \ |
| + .align ALIGNARG(alignt); \ |
| + EALIGN_W_##words; \ |
| + BODY_LABEL(__strstr_power7): \ |
| + cfi_startproc; \ |
| + LOCALENTRY(__strstr_power7) |
| + |
| +#undef END |
| +#define END(name) \ |
| + cfi_endproc; \ |
| + TRACEBACK(__strstr_power7) \ |
| + END_2(__strstr_power7) |
| + |
| +#undef libc_hidden_builtin_def |
| +#define libc_hidden_builtin_def(name) |
| + |
| +#define STRLEN __strlen_power7 |
| +#define STRNLEN __strnlen_power7 |
| +#define STRCHR __strchr_power7 |
| + |
| +#include <sysdeps/powerpc/powerpc64/power7/strstr.S> |
| diff --git a/sysdeps/powerpc/powerpc64/multiarch/strstr-ppc64.c b/sysdeps/powerpc/powerpc64/multiarch/strstr-ppc64.c |
| new file mode 100644 |
| index 0000000..7fa2ace |
| |
| |
| @@ -0,0 +1,29 @@ |
| +/* 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 <string.h> |
| + |
| +#define STRSTR __strstr_ppc |
| +#if IS_IN (libc) && defined(SHARED) |
| +# undef libc_hidden_builtin_def |
| +# define libc_hidden_builtin_def(name) \ |
| + __hidden_ver1(__strstr_ppc, __GI_strstr, __strstr_ppc); |
| +#endif |
| + |
| +extern __typeof (strstr) __strstr_ppc attribute_hidden; |
| + |
| +#include <string/strstr.c> |
| diff --git a/sysdeps/powerpc/powerpc64/multiarch/strstr.c b/sysdeps/powerpc/powerpc64/multiarch/strstr.c |
| new file mode 100644 |
| index 0000000..2be7646 |
| |
| |
| @@ -0,0 +1,34 @@ |
| +/* Multiple versions of strstr. PowerPC64 version. |
| + 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/>. */ |
| + |
| +/* Define multiple versions only for definition in libc. */ |
| +#if IS_IN (libc) |
| +# include <string.h> |
| +# include <shlib-compat.h> |
| +# include "init-arch.h" |
| + |
| +extern __typeof (strstr) __strstr_ppc attribute_hidden; |
| +extern __typeof (strstr) __strstr_power7 attribute_hidden; |
| + |
| +/* Avoid DWARF definition DIE on ifunc symbol so that GDB can handle |
| + ifunc symbol properly. */ |
| +libc_ifunc (strstr, |
| + (hwcap & PPC_FEATURE_HAS_VSX) |
| + ? __strstr_power7 |
| + : __strstr_ppc); |
| +#endif |
| diff --git a/sysdeps/powerpc/powerpc64/power7/strstr.S b/sysdeps/powerpc/powerpc64/power7/strstr.S |
| new file mode 100644 |
| index 0000000..8dca31c |
| |
| |
| @@ -0,0 +1,509 @@ |
| +/* Optimized strstr implementation for PowerPC64/POWER7. |
| + 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> |
| + |
| +/* Char * [r3] strstr (char *s [r3], char * pat[r4]) */ |
| + |
| +/* The performance gain is obtained using aligned memory access, load |
| + * doubleword and usage of cmpb instruction for quicker comparison. */ |
| + |
| +#ifndef STRLEN |
| +/* For builds with no IFUNC support, local calls should be made to internal |
| + GLIBC symbol (created by libc_hidden_builtin_def). */ |
| +# ifdef SHARED |
| +# define STRLEN __GI_strlen |
| +# else |
| +# define STRLEN strlen |
| +# endif |
| +#endif |
| + |
| +#ifndef STRNLEN |
| +/* For builds with no IFUNC support, local calls should be made to internal |
| + GLIBC symbol (created by libc_hidden_builtin_def). */ |
| +# ifdef SHARED |
| +# define STRNLEN __GI_strnlen |
| +# else |
| +# define STRNLEN strnlen |
| +# endif |
| +#endif |
| + |
| +#ifndef STRCHR |
| +# ifdef SHARED |
| +# define STRCHR __GI_strchr |
| +# else |
| +# define STRCHR strchr |
| +# endif |
| +#endif |
| + |
| +#define FRAMESIZE (FRAME_MIN_SIZE+32) |
| + .machine power7 |
| +EALIGN (strstr, 4, 0) |
| + CALL_MCOUNT 2 |
| + mflr r0 /* Load link register LR to r0. */ |
| + std r31, -8(r1) /* Save callers register r31. */ |
| + cfi_offset(r31, -8) |
| + std r30, -16(r1) /* Save callers register r30. */ |
| + cfi_offset(r30, -16) |
| + std r29, -24(r1) /* Save callers register r29. */ |
| + cfi_offset(r29, -24) |
| + std r0, 16(r1) /* Store the link register. */ |
| + cfi_offset(lr, 16) |
| + stdu r1, -FRAMESIZE(r1) /* Create the stack frame. */ |
| + cfi_adjust_cfa_offset(FRAMESIZE) |
| + |
| + dcbt 0, r3 |
| + dcbt 0, r4 |
| + |
| + cmpdi cr7, r3, 0 |
| + beq cr7, L(retnull) |
| + cmpdi cr7, r4, 0 |
| + beq cr7, L(retnull) |
| + |
| + mr r29, r3 |
| + mr r30, r4 |
| + mr r3, r4 |
| + bl STRLEN |
| + nop |
| + |
| + cmpdi cr7, r3, 0 /* If search str is null. */ |
| + beq cr7, L(ret_r3) |
| + |
| + /* Call __strstr_ppc if needle len > 2048 */ |
| + cmpdi cr7, r3, 2048 |
| + bgt cr7, L(default) |
| + |
| + mr r31, r3 |
| + mr r4, r3 |
| + mr r3, r29 |
| + bl STRNLEN |
| + nop |
| + |
| + cmpd cr7, r3, r31 /* If len(r3) < len(r4). */ |
| + blt cr7, L(retnull) |
| + mr r3, r29 |
| + lbz r4, 0(r30) |
| + bl STRCHR |
| + nop |
| + |
| + mr r11, r3 |
| + /* If first char of search str is not present. */ |
| + cmpdi cr7, r3, 0 |
| + ble cr7, L(end) |
| + |
| + rldicl r8, r3, 0, 52 /* Page cross check. */ |
| + cmpldi cr7, r8, 4096-16 |
| + bgt cr7, L(bytebybyte) |
| + |
| + rldicl r8, r30, 0, 52 |
| + cmpldi cr7, r8, 4096-16 |
| + bgt cr7, L(bytebybyte) |
| + |
| + /* If len(r4) < 8 handle in a different way. */ |
| + /* Shift position based on null and use cmpb. */ |
| + cmpdi cr7, r31, 8 |
| + blt cr7, L(lessthan8) |
| + |
| + /* Len(r4) >= 8 reaches here. */ |
| + mr r8, r3 /* Save r3 for future use. */ |
| + mr r4, r30 /* Restore r4. */ |
| + li r0, 0 |
| + rlwinm r10, r30, 3, 26, 28 /* Calculate padding in bits. */ |
| + clrrdi r4, r4, 3 /* Make r4 aligned to 8. */ |
| + ld r6, 0(r4) |
| + addi r4, r4, 8 |
| + cmpdi cr7, r10, 0 /* Check if its already aligned? */ |
| + beq cr7, L(begin1) |
| +#ifdef __LITTLE_ENDIAN__ |
| + srd r6, r6, r10 /* Discard unwanted bits. */ |
| +#else |
| + sld r6, r6, r10 |
| +#endif |
| + ld r9, 0(r4) |
| + subfic r10, r10, 64 |
| +#ifdef __LITTLE_ENDIAN__ |
| + sld r9, r9, r10 /* Discard unwanted bits. */ |
| +#else |
| + srd r9, r9, r10 |
| +#endif |
| + or r6, r6, r9 /* Form complete search str. */ |
| +L(begin1): |
| + mr r29, r6 |
| + rlwinm r10, r3, 3, 26, 28 |
| + clrrdi r3, r3, 3 |
| + ld r5, 0(r3) |
| + cmpb r9, r0, r6 /* Check if input has null. */ |
| + cmpdi cr7, r9, 0 |
| + bne cr7, L(return3) |
| + cmpb r9, r0, r5 /* Check if input has null. */ |
| +#ifdef __LITTLE_ENDIAN__ |
| + srd r9, r9, r10 |
| +#else |
| + sld r9, r9, r10 |
| +#endif |
| + cmpdi cr7, r9, 0 |
| + bne cr7, L(retnull) |
| + |
| + li r12, -8 /* Shift values. */ |
| + li r11, 72 /* Shift values. */ |
| + cmpdi cr7, r10, 0 |
| + beq cr7, L(nextbyte1) |
| + mr r12, r10 |
| + addi r12, r12, -8 |
| + subfic r11, r12, 64 |
| + |
| +L(nextbyte1): |
| + ldu r7, 8(r3) /* Load next dw. */ |
| + addi r12, r12, 8 /* Shift one byte and compare. */ |
| + addi r11, r11, -8 |
| +#ifdef __LITTLE_ENDIAN__ |
| + srd r9, r5, r12 /* Rotate based on mask. */ |
| + sld r10, r7, r11 |
| +#else |
| + sld r9, r5, r12 |
| + srd r10, r7, r11 |
| +#endif |
| + /* Form single dw from few bytes on first load and second load. */ |
| + or r10, r9, r10 |
| + /* Check for null in the formed dw. */ |
| + cmpb r9, r0, r10 |
| + cmpdi cr7, r9, 0 |
| + bne cr7, L(retnull) |
| + /* Cmpb search str and input str. */ |
| + cmpb r9, r10, r6 |
| + cmpdi cr7, r9, -1 |
| + beq cr7, L(match) |
| + addi r8, r8, 1 |
| + b L(begin) |
| + |
| + .align 4 |
| +L(match): |
| + /* There is a match of 8 bytes, check next bytes. */ |
| + cmpdi cr7, r31, 8 |
| + beq cr7, L(return) |
| + /* Update next starting point r8. */ |
| + srdi r9, r11, 3 |
| + subf r9, r9, r3 |
| + mr r8, r9 |
| + |
| +L(secondmatch): |
| + mr r5, r7 |
| + rlwinm r10, r30, 3, 26, 28 /* Calculate padding in bits. */ |
| + ld r6, 0(r4) |
| + addi r4, r4, 8 |
| + cmpdi cr7, r10, 0 /* Check if its already aligned? */ |
| + beq cr7, L(proceed3) |
| +#ifdef __LITTLE_ENDIAN__ |
| + srd r6, r6, r10 /* Discard unwanted bits. */ |
| + cmpb r9, r0, r6 |
| + sld r9, r9, r10 |
| +#else |
| + sld r6, r6, r10 |
| + cmpb r9, r0, r6 |
| + srd r9, r9, r10 |
| +#endif |
| + cmpdi cr7, r9, 0 |
| + bne cr7, L(proceed3) |
| + ld r9, 0(r4) |
| + subfic r10, r10, 64 |
| +#ifdef __LITTLE_ENDIAN__ |
| + sld r9, r9, r10 /* Discard unwanted bits. */ |
| +#else |
| + srd r9, r9, r10 |
| +#endif |
| + or r6, r6, r9 /* Form complete search str. */ |
| + |
| +L(proceed3): |
| + li r7, 0 |
| + addi r3, r3, 8 |
| + cmpb r9, r0, r5 |
| + cmpdi cr7, r9, 0 |
| + bne cr7, L(proceed4) |
| + ld r7, 0(r3) |
| +L(proceed4): |
| +#ifdef __LITTLE_ENDIAN__ |
| + srd r9, r5, r12 |
| + sld r10, r7, r11 |
| +#else |
| + sld r9, r5, r12 |
| + srd r10, r7, r11 |
| +#endif |
| + /* Form single dw with few bytes from first and second load. */ |
| + or r10, r9, r10 |
| + cmpb r9, r0, r6 |
| + cmpdi cr7, r9, 0 |
| + bne cr7, L(return4) |
| + /* Check for null in the formed dw. */ |
| + cmpb r9, r0, r10 |
| + cmpdi cr7, r9, 0 |
| + bne cr7, L(retnull) |
| + /* If the next 8 bytes dont match, start search again. */ |
| + cmpb r9, r10, r6 |
| + cmpdi cr7, r9, -1 |
| + bne cr7, L(reset) |
| + /* If the next 8 bytes match, load and compare next 8. */ |
| + b L(secondmatch) |
| + |
| + .align 4 |
| +L(reset): |
| + /* Start the search again. */ |
| + addi r8, r8, 1 |
| + b L(begin) |
| + |
| + .align 4 |
| +L(return3): |
| + /* Count leading zeros and compare partial dw. */ |
| +#ifdef __LITTLE_ENDIAN__ |
| + addi r7, r9, -1 |
| + andc r7, r7, r9 |
| + popcntd r7, r7 |
| + subfic r7, r7, 64 |
| + sld r10, r5, r7 |
| + sld r6, r6, r7 |
| +#else |
| + cntlzd r7, r9 |
| + subfic r7, r7, 64 |
| + srd r10, r5, r7 |
| + srd r6, r6, r7 |
| +#endif |
| + cmpb r9, r10, r6 |
| + cmpdi cr7, r9, -1 |
| + addi r8, r8, 1 |
| + /* Start search again if there is no match. */ |
| + bne cr7, L(begin) |
| + /* If the words match, update return values. */ |
| + subfic r7, r7, 64 |
| + srdi r7, r7, 3 |
| + add r3, r3, r7 |
| + subf r3, r31, r3 |
| + b L(end) |
| + |
| + .align 4 |
| +L(return4): |
| + /* Count leading zeros and compare partial dw. */ |
| +#ifdef __LITTLE_ENDIAN__ |
| + addi r7, r9, -1 |
| + andc r7, r7, r9 |
| + popcntd r7, r7 |
| + subfic r7, r7, 64 |
| + sld r10, r10, r7 |
| + sld r6, r6, r7 |
| +#else |
| + cntlzd r7, r9 |
| + subfic r7, r7, 64 |
| + srd r10, r10, r7 |
| + srd r6, r6, r7 |
| +#endif |
| + cmpb r9, r10, r6 |
| + cmpdi cr7, r9, -1 |
| + addi r8, r8, 1 |
| + bne cr7, L(begin) |
| + subfic r7, r7, 64 |
| + srdi r11, r11, 3 |
| + subf r3, r11, r3 |
| + srdi r7, r7, 3 |
| + add r3, r3, r7 |
| + subf r3, r31, r3 |
| + b L(end) |
| + |
| + .align 4 |
| +L(begin): |
| + mr r3, r8 |
| + lbz r4, 0(r30) |
| + bl STRCHR |
| + nop |
| + /* If first char of search str is not present. */ |
| + cmpdi cr7, r3, 0 |
| + ble cr7, L(end) |
| + mr r8, r3 |
| + mr r4, r30 /* Restore r4. */ |
| + li r0, 0 |
| + mr r6, r29 |
| + clrrdi r4, r4, 3 |
| + addi r4, r4, 8 |
| + b L(begin1) |
| + |
| + /* Handle less than 8 search string. */ |
| + .align 4 |
| +L(lessthan8): |
| + mr r4, r3 |
| + mr r9, r30 |
| + li r0, 0 |
| + |
| + rlwinm r10, r9, 3, 26, 28 /* Calculate padding in bits. */ |
| + srdi r8, r10, 3 /* Padding in bytes. */ |
| + clrrdi r9, r9, 3 /* Make r4 aligned to 8. */ |
| + ld r6, 0(r9) |
| + cmpdi cr7, r10, 0 /* Check if its already aligned? */ |
| + beq cr7, L(proceed2) |
| +#ifdef __LITTLE_ENDIAN__ |
| + srd r6, r6, r10 /* Discard unwanted bits. */ |
| +#else |
| + sld r6, r6, r10 |
| +#endif |
| + subfic r8, r8, 8 |
| + cmpd cr7, r8, r31 /* Next load needed? */ |
| + bge cr7, L(proceed2) |
| + ld r7, 8(r9) |
| + subfic r10, r10, 64 |
| +#ifdef __LITTLE_ENDIAN__ |
| + sld r7, r7, r10 /* Discard unwanted bits. */ |
| +#else |
| + srd r7, r7, r10 |
| +#endif |
| + or r6, r6, r7 /* Form complete search str. */ |
| +L(proceed2): |
| + mr r29, r6 |
| + rlwinm r10, r3, 3, 26, 28 |
| + clrrdi r7, r3, 3 /* Make r3 aligned. */ |
| + ld r5, 0(r7) |
| + sldi r8, r31, 3 |
| + subfic r8, r8, 64 |
| +#ifdef __LITTLE_ENDIAN__ |
| + sld r6, r6, r8 |
| + cmpb r9, r0, r5 |
| + srd r9, r9, r10 |
| +#else |
| + srd r6, r6, r8 |
| + cmpb r9, r0, r5 |
| + sld r9, r9, r10 |
| +#endif |
| + cmpdi cr7, r9, 0 |
| + bne cr7, L(noload) |
| + cmpdi cr7, r10, 0 |
| + beq cr7, L(continue) |
| + ld r7, 8(r7) |
| +L(continue1): |
| + mr r12, r10 |
| + addi r12, r12, -8 |
| + subfic r11, r12, 64 |
| + b L(nextbyte) |
| + |
| + .align 4 |
| +L(continue): |
| + ld r7, 8(r7) |
| + li r12, -8 /* Shift values. */ |
| + li r11, 72 /* Shift values. */ |
| +L(nextbyte): |
| + addi r12, r12, 8 /* Mask for rotation. */ |
| + addi r11, r11, -8 |
| +#ifdef __LITTLE_ENDIAN__ |
| + srd r9, r5, r12 |
| + sld r10, r7, r11 |
| + or r10, r9, r10 |
| + sld r10, r10, r8 |
| + cmpb r9, r0, r10 |
| + srd r9, r9, r8 |
| +#else |
| + sld r9, r5, r12 |
| + srd r10, r7, r11 |
| + or r10, r9, r10 |
| + srd r10, r10, r8 |
| + cmpb r9, r0, r10 |
| + sld r9, r9, r8 |
| +#endif |
| + cmpdi cr7, r9, 0 |
| + bne cr7, L(retnull) |
| + cmpb r9, r10, r6 |
| + cmpdi cr7, r9, -1 |
| + beq cr7, L(end) |
| + addi r3, r4, 1 |
| + lbz r4, 0(r30) |
| + bl STRCHR |
| + nop |
| + /* If first char of search str is not present. */ |
| + cmpdi cr7, r3, 0 |
| + ble cr7, L(end) |
| + mr r4, r3 |
| + mr r6, r29 |
| + li r0, 0 |
| + b L(proceed2) |
| + |
| + .align 4 |
| +L(noload): |
| + /* Reached null in r3, so skip next load. */ |
| + li r7, 0 |
| + b L(continue1) |
| + |
| + .align 4 |
| +L(return): |
| + /* Update return values. */ |
| + srdi r9, r11, 3 |
| + subf r3, r9, r3 |
| + b L(end) |
| + |
| + /* Handling byte by byte. */ |
| + .align 4 |
| +L(bytebybyte): |
| + mr r8, r3 |
| + addi r8, r8, -1 |
| +L(loop1): |
| + addi r8, r8, 1 |
| + mr r3, r8 |
| + mr r4, r30 |
| + lbz r6, 0(r4) |
| + cmpdi cr7, r6, 0 |
| + beq cr7, L(updater3) |
| +L(loop): |
| + lbz r5, 0(r3) |
| + cmpdi cr7, r5, 0 |
| + beq cr7, L(retnull) |
| + cmpld cr7, r6, r5 |
| + bne cr7, L(loop1) |
| + addi r3, r3, 1 |
| + addi r4, r4, 1 |
| + lbz r6, 0(r4) |
| + cmpdi cr7, r6, 0 |
| + beq cr7, L(updater3) |
| + b L(loop) |
| + |
| + /* Handling return values. */ |
| + .align 4 |
| +L(updater3): |
| + subf r3, r31, r3 /* Reduce len of r4 from r3. */ |
| + b L(end) |
| + |
| + .align 4 |
| +L(ret_r3): |
| + mr r3, r29 /* Return r3. */ |
| + b L(end) |
| + |
| + .align 4 |
| +L(retnull): |
| + li r3, 0 /* Return NULL. */ |
| + b L(end) |
| + |
| + .align 4 |
| +L(default): |
| + mr r3, r29 |
| + mr r4, r30 |
| + bl __strstr_ppc |
| + nop |
| + |
| + .align 4 |
| +L(end): |
| + addi r1, r1, FRAMESIZE /* Restore stack pointer. */ |
| + cfi_adjust_cfa_offset(-FRAMESIZE) |
| + ld r0, 16(r1) /* Restore the saved link register. */ |
| + ld r29, -24(r1) /* Restore callers save register r29. */ |
| + ld r30, -16(r1) /* Restore callers save register r30. */ |
| + ld r31, -8(r1) /* Restore callers save register r31. */ |
| + mtlr r0 /* Branch to link register. */ |
| + blr |
| +END (strstr) |
| +libc_hidden_builtin_def (strstr) |
| -- |
| 2.1.0 |
| |