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Diffstat (limited to 'sysdeps/powerpc/powerpc32/power7/rawmemchr.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/power7/rawmemchr.S | 110 |
1 files changed, 0 insertions, 110 deletions
diff --git a/sysdeps/powerpc/powerpc32/power7/rawmemchr.S b/sysdeps/powerpc/powerpc32/power7/rawmemchr.S deleted file mode 100644 index 22edcfb209..0000000000 --- a/sysdeps/powerpc/powerpc32/power7/rawmemchr.S +++ /dev/null @@ -1,110 +0,0 @@ -/* Optimized rawmemchr 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] rawmemchr (void *s [r3], int c [r4]) */ - .machine power7 -ENTRY (__rawmemchr) - CALL_MCOUNT - dcbt 0,r3 - clrrwi r8,r3,2 /* Align the address to word boundary. */ - - /* Replicate byte to word. */ - insrwi r4,r4,8,16 - insrwi r4,r4,16,0 - - /* Now r4 has a word of c bytes. */ - - rlwinm r6,r3,3,27,28 /* Calculate padding. */ - lwz r12,0(r8) /* Load word from memory. */ - cmpb r5,r12,r4 /* Compare each byte against c byte. */ -#ifdef __LITTLE_ENDIAN__ - srw r5,r5,r6 - slw r5,r5,r6 -#else - slw r5,r5,r6 /* Move left to discard ignored bits. */ - srw r5,r5,r6 /* Bring the bits back as zeros. */ -#endif - cmpwi cr7,r5,0 /* If r5 == 0, no c 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. */ - - bt 29,L(loop) - - /* Handle WORD2 of pair. */ - lwzu r12,4(r8) - cmpb r5,r12,r4 - cmpwi cr7,r5,0 - bne cr7,L(done) - b L(loop) /* We branch here (rather than falling through) - to skip the nops due to heavy alignment - of the loop below. */ - - /* Main loop to look for the end of the string. Since it's a - small loop (< 8 instructions), align it to 32-bytes. */ - .p2align 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. */ - lwz r12,4(r8) - lwzu r11,8(r8) - cmpb r5,r12,r4 - cmpb r6,r11,r4 - or r7,r5,r6 - cmpwi cr7,r7,0 - beq cr7,L(loop) - - /* OK, one (or both) of the words contains a 'c' byte. Check - the first word and decrement the address in case the first - word really contains a c byte. */ - - cmpwi cr6,r5,0 - addi r8,r8,-4 - bne cr6,L(done) - - /* The 'c' byte must be in the second word. Adjust the address - again and move the result of cmpb to r10 so we can calculate the - pointer. */ - mr r5,r6 - addi r8,r8,4 - - /* r5 has the output of the cmpb instruction, that is, it contains - 0xff in the same position as the 'c' byte in the original - word from the string. Use that fact to find out what is - the position of the byte inside the string. */ -L(done): -#ifdef __LITTLE_ENDIAN__ - addi r0,r5,-1 - andc r0,r0,r5 - popcntw r0,r0 -#else - cntlzw r0,r5 /* Count leading zeros before the match. */ -#endif - srwi r0,r0,3 /* Convert leading zeros to bytes. */ - add r3,r8,r0 /* Return address of the matching char. */ - blr -END (__rawmemchr) -weak_alias (__rawmemchr,rawmemchr) -libc_hidden_builtin_def (__rawmemchr) |