diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc64/power7/memchr.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/power7/memchr.S | 199 |
1 files changed, 0 insertions, 199 deletions
diff --git a/sysdeps/powerpc/powerpc64/power7/memchr.S b/sysdeps/powerpc/powerpc64/power7/memchr.S deleted file mode 100644 index 5e9707aa02..0000000000 --- a/sysdeps/powerpc/powerpc64/power7/memchr.S +++ /dev/null @@ -1,199 +0,0 @@ -/* Optimized memchr implementation for PowerPC64/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] memchr (char *s [r3], int byte [r4], int size [r5]) */ - -#ifndef MEMCHR -# define MEMCHR __memchr -#endif - .machine power7 -ENTRY (MEMCHR) - CALL_MCOUNT 3 - dcbt 0,r3 - clrrdi r8,r3,3 - insrdi r4,r4,8,48 - - /* Calculate the last acceptable address and check for possible - addition overflow by using satured math: - r7 = r3 + r5 - r7 |= -(r7 < x) */ - add r7,r3,r5 - subfc r6,r3,r7 - subfe r9,r9,r9 - extsw r6,r9 - or r7,r7,r6 - - insrdi r4,r4,16,32 - cmpldi r5,32 - li r9, -1 - rlwinm r6,r3,3,26,28 /* Calculate padding. */ - insrdi r4,r4,32,0 - addi r7,r7,-1 -#ifdef __LITTLE_ENDIAN__ - sld r9,r9,r6 -#else - srd r9,r9,r6 -#endif - ble L(small_range) - - ld r12,0(r8) /* Load doubleword from memory. */ - cmpb r3,r12,r4 /* Check for BYTEs in DWORD1. */ - and r3,r3,r9 - clrldi r5,r7,61 /* Byte count - 1 in last dword. */ - clrrdi r7,r7,3 /* Address of last doubleword. */ - cmpldi cr7,r3,0 /* Does r3 indicate we got a hit? */ - bne cr7,L(done) - - mtcrf 0x01,r8 - /* Are we now aligned to a quadword boundary? If so, skip to - the main loop. Otherwise, go through the alignment code. */ - bt 28,L(loop_setup) - - /* Handle DWORD2 of pair. */ - ldu r12,8(r8) - cmpb r3,r12,r4 - cmpldi cr7,r3,0 - bne cr7,L(done) - -L(loop_setup): - /* The last dword we want to read in the loop below is the one - containing the last byte of the string, ie. the dword at - (s + size - 1) & ~7, or r7. The first dword read is at - r8 + 8, we read 2 * cnt dwords, so the last dword read will - be at r8 + 8 + 16 * cnt - 8. Solving for cnt gives - cnt = (r7 - r8) / 16 */ - sub r6,r7,r8 - srdi r6,r6,4 /* Number of loop iterations. */ - mtctr r6 /* Setup the counter. */ - - /* Main loop to look for BYTE in the string. Since - it's a small loop (8 instructions), align it to 32-bytes. */ - .align 5 -L(loop): - /* Load two doublewords, compare and merge in a - single register for speed. This is an attempt - to speed up the byte-checking process for bigger strings. */ - ld r12,8(r8) - ldu r11,16(r8) - cmpb r3,r12,r4 - cmpb r9,r11,r4 - or r6,r9,r3 /* Merge everything in one doubleword. */ - cmpldi cr7,r6,0 - bne cr7,L(found) - bdnz L(loop) - - /* We may have one more dword to read. */ - cmpld r8,r7 - beqlr - - ldu r12,8(r8) - cmpb r3,r12,r4 - cmpldi cr6,r3,0 - bne cr6,L(done) - blr - - .align 4 -L(found): - /* OK, one (or both) of the doublewords contains BYTE. Check - the first doubleword and decrement the address in case the first - doubleword really contains BYTE. */ - cmpldi cr6,r3,0 - addi r8,r8,-8 - bne cr6,L(done) - - /* BYTE must be in the second doubleword. Adjust the address - again and move the result of cmpb to r3 so we can calculate the - pointer. */ - - mr r3,r9 - addi r8,r8,8 - - /* r3 has the output of the cmpb instruction, that is, it contains - 0xff in the same position as BYTE in the original - doubleword from the string. Use that to calculate the pointer. - We need to make sure BYTE is *before* the end of the range. */ -L(done): -#ifdef __LITTLE_ENDIAN__ - addi r0,r3,-1 - andc r0,r0,r3 - popcntd r0,r0 /* Count trailing zeros. */ -#else - cntlzd r0,r3 /* Count leading zeros before the match. */ -#endif - cmpld r8,r7 /* Are we on the last dword? */ - srdi r0,r0,3 /* Convert leading/trailing zeros to bytes. */ - add r3,r8,r0 - cmpld cr7,r0,r5 /* If on the last dword, check byte offset. */ - bnelr - blelr cr7 - li r3,0 - blr - - .align 4 -L(null): - li r3,0 - blr - -/* Deals with size <= 32. */ - .align 4 -L(small_range): - cmpldi r5,0 - beq L(null) - ld r12,0(r8) /* Load word from memory. */ - cmpb r3,r12,r4 /* Check for BYTE in DWORD1. */ - and r3,r3,r9 - cmpldi cr7,r3,0 - clrldi r5,r7,61 /* Byte count - 1 in last dword. */ - clrrdi r7,r7,3 /* Address of last doubleword. */ - cmpld r8,r7 /* Are we done already? */ - bne cr7,L(done) - beqlr - - ldu r12,8(r8) - cmpb r3,r12,r4 - cmpldi cr6,r3,0 - cmpld r8,r7 - bne cr6,L(done) /* Found something. */ - beqlr /* Hit end of string (length). */ - - ldu r12,8(r8) - cmpb r3,r12,r4 - cmpldi cr6,r3,0 - cmpld r8,r7 - bne cr6,L(done) - beqlr - - ldu r12,8(r8) - cmpb r3,r12,r4 - cmpldi cr6,r3,0 - cmpld r8,r7 - bne cr6,L(done) - beqlr - - ldu r12,8(r8) - cmpb r3,r12,r4 - cmpldi cr6,r3,0 - bne cr6,L(done) - blr - -END (MEMCHR) -weak_alias (__memchr, memchr) -libc_hidden_builtin_def (memchr) |