diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc32/power7/memrchr.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/power7/memrchr.S | 196 |
1 files changed, 0 insertions, 196 deletions
diff --git a/sysdeps/powerpc/powerpc32/power7/memrchr.S b/sysdeps/powerpc/powerpc32/power7/memrchr.S deleted file mode 100644 index eb0c1bb8eb..0000000000 --- a/sysdeps/powerpc/powerpc32/power7/memrchr.S +++ /dev/null @@ -1,196 +0,0 @@ -/* Optimized memrchr implementation for PowerPC32/POWER7 using cmpb insn. - Copyright (C) 2010-2017 Free Software Foundation, Inc. - Contributed by Luis Machado <luisgpm@br.ibm.com>. - 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> - -/* int [r3] memrchr (char *s [r3], int byte [r4], int size [r5]) */ - .machine power7 -ENTRY (__memrchr) - CALL_MCOUNT - add r7,r3,r5 /* Calculate the last acceptable address. */ - neg r0,r7 - addi r7,r7,-1 - mr r10,r3 - clrrwi r6,r7,7 - li r9,3<<5 - dcbt r9,r6,16 /* Stream hint, decreasing addresses. */ - - /* Replicate BYTE to word. */ - insrwi r4,r4,8,16 - insrwi r4,r4,16,0 - li r6,-4 - li r9,-1 - rlwinm r0,r0,3,27,28 /* Calculate padding. */ - clrrwi r8,r7,2 - srw r9,r9,r0 - cmplwi r5,16 - clrrwi r0,r10,2 - ble L(small_range) - -#ifdef __LITTLE_ENDIAN__ - lwzx r12,0,r8 -#else - lwbrx r12,0,r8 /* Load reversed word from memory. */ -#endif - cmpb r3,r12,r4 /* Check for BYTE in WORD1. */ - and r3,r3,r9 - cmplwi cr7,r3,0 /* If r3 == 0, no BYTEs have been found. */ - bne cr7,L(done) - - mtcrf 0x01,r8 - /* Are we now aligned to a doubleword boundary? If so, skip to - the main loop. Otherwise, go through the alignment code. */ - bf 29,L(loop_setup) - - /* Handle WORD2 of pair. */ -#ifdef __LITTLE_ENDIAN__ - lwzx r12,r8,r6 -#else - lwbrx r12,r8,r6 -#endif - addi r8,r8,-4 - cmpb r3,r12,r4 - cmplwi cr7,r3,0 - bne cr7,L(done) - -L(loop_setup): - /* The last word we want to read in the loop below is the one - containing the first byte of the string, ie. the word at - s & ~3, or r0. The first word read is at r8 - 4, we - read 2 * cnt words, so the last word read will be at - r8 - 4 - 8 * cnt + 4. Solving for cnt gives - cnt = (r8 - r0) / 8 */ - sub r5,r8,r0 - addi r8,r8,-4 - srwi r9,r5,3 /* Number of loop iterations. */ - mtctr r9 /* Setup the counter. */ - - /* Main loop to look for BYTE backwards in the string. - FIXME: Investigate whether 32 byte align helps with this - 9 instruction loop. */ - .align 5 -L(loop): - /* Load two words, compare and merge in a - single register for speed. This is an attempt - to speed up the byte-checking process for bigger strings. */ - -#ifdef __LITTLE_ENDIAN__ - lwzx r12,0,r8 - lwzx r11,r8,r6 -#else - lwbrx r12,0,r8 - lwbrx r11,r8,r6 -#endif - cmpb r3,r12,r4 - cmpb r9,r11,r4 - or r5,r9,r3 /* Merge everything in one word. */ - cmplwi cr7,r5,0 - bne cr7,L(found) - addi r8,r8,-8 - bdnz L(loop) - - /* We may have one more word to read. */ - cmplw r8,r0 - bnelr - -#ifdef __LITTLE_ENDIAN__ - lwzx r12,0,r8 -#else - lwbrx r12,0,r8 -#endif - cmpb r3,r12,r4 - cmplwi cr7,r3,0 - bne cr7,L(done) - blr - - .align 4 -L(found): - /* OK, one (or both) of the words contains BYTE. Check - the first word. */ - cmplwi cr6,r3,0 - bne cr6,L(done) - - /* BYTE must be in the second word. Adjust the address - again and move the result of cmpb to r3 so we can calculate the - pointer. */ - - mr r3,r9 - addi r8,r8,-4 - - /* r3 has the output of the cmpb instruction, that is, it contains - 0xff in the same position as BYTE in the original - word from the string. Use that to calculate the pointer. - We need to make sure BYTE is *before* the end of the - range. */ -L(done): - cntlzw r9,r3 /* Count leading zeros before the match. */ - cmplw r8,r0 /* Are we on the last word? */ - srwi r6,r9,3 /* Convert leading zeros to bytes. */ - addi r0,r6,-3 - sub r3,r8,r0 - cmplw cr7,r3,r10 - bnelr - bgelr cr7 - li r3,0 - blr - - .align 4 -L(null): - li r3,0 - blr - -/* Deals with size <= 16. */ - .align 4 -L(small_range): - cmplwi r5,0 - beq L(null) - -#ifdef __LITTLE_ENDIAN__ - lwzx r12,0,r8 -#else - lwbrx r12,0,r8 /* Load reversed word from memory. */ -#endif - cmpb r3,r12,r4 /* Check for BYTE in WORD1. */ - and r3,r3,r9 - cmplwi cr7,r3,0 - bne cr7,L(done) - - /* Are we done already? */ - cmplw r8,r0 - addi r8,r8,-4 - beqlr - - .align 5 -L(loop_small): -#ifdef __LITTLE_ENDIAN__ - lwzx r12,0,r8 -#else - lwbrx r12,0,r8 -#endif - cmpb r3,r12,r4 - cmplw r8,r0 - cmplwi cr7,r3,0 - bne cr7,L(done) - addi r8,r8,-4 - bne L(loop_small) - blr - -END (__memrchr) -weak_alias (__memrchr, memrchr) -libc_hidden_builtin_def (memrchr) |