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Diffstat (limited to 'lib/libc/arm/string/memcmp.S')
| -rw-r--r-- | lib/libc/arm/string/memcmp.S | 180 |
1 files changed, 0 insertions, 180 deletions
diff --git a/lib/libc/arm/string/memcmp.S b/lib/libc/arm/string/memcmp.S deleted file mode 100644 index a81c960..0000000 --- a/lib/libc/arm/string/memcmp.S +++ /dev/null @@ -1,180 +0,0 @@ -/* $NetBSD: memcmp.S,v 1.3 2003/10/14 07:51:45 scw Exp $ */ - -/* - * Copyright 2003 Wasabi Systems, Inc. - * All rights reserved. - * - * Written by Steve C. Woodford for Wasabi Systems, Inc. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed for the NetBSD Project by - * Wasabi Systems, Inc. - * 4. The name of Wasabi Systems, Inc. may not be used to endorse - * or promote products derived from this software without specific prior - * written permission. - * - * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED - * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR - * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC - * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR - * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF - * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN - * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - */ -/* - * Copyright (c) 2002 ARM Ltd - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. The name of the company may not be used to endorse or promote - * products derived from this software without specific prior written - * permission. - * - * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED - * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. - * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED - * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR - * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF - * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include <machine/asm.h> - -__FBSDID("$FreeBSD$"); - -ENTRY(memcmp) - mov ip, r0 -#if defined(_KERNEL) && !defined(_STANDALONE) - cmp r2, #0x06 - beq .Lmemcmp_6bytes -#endif - mov r0, #0x00 - - /* Are both addresses aligned the same way? */ - cmp r2, #0x00 - eornes r3, ip, r1 - RETeq /* len == 0, or same addresses! */ - tst r3, #0x03 - subne r2, r2, #0x01 - bne .Lmemcmp_bytewise2 /* Badly aligned. Do it the slow way */ - - /* Word-align the addresses, if necessary */ - sub r3, r1, #0x05 - ands r3, r3, #0x03 - add r3, r3, r3, lsl #1 - addne pc, pc, r3, lsl #3 - nop - - /* Compare up to 3 bytes */ - ldrb r0, [ip], #0x01 - ldrb r3, [r1], #0x01 - subs r0, r0, r3 - RETne - subs r2, r2, #0x01 - RETeq - - /* Compare up to 2 bytes */ - ldrb r0, [ip], #0x01 - ldrb r3, [r1], #0x01 - subs r0, r0, r3 - RETne - subs r2, r2, #0x01 - RETeq - - /* Compare 1 byte */ - ldrb r0, [ip], #0x01 - ldrb r3, [r1], #0x01 - subs r0, r0, r3 - RETne - subs r2, r2, #0x01 - RETeq - - /* Compare 4 bytes at a time, if possible */ - subs r2, r2, #0x04 - bcc .Lmemcmp_bytewise -.Lmemcmp_word_aligned: - ldr r0, [ip], #0x04 - ldr r3, [r1], #0x04 - subs r2, r2, #0x04 - cmpcs r0, r3 - beq .Lmemcmp_word_aligned - sub r0, r0, r3 - - /* Correct for extra subtraction, and check if done */ - adds r2, r2, #0x04 - cmpeq r0, #0x00 /* If done, did all bytes match? */ - RETeq /* Yup. Just return */ - - /* Re-do the final word byte-wise */ - sub ip, ip, #0x04 - sub r1, r1, #0x04 - -.Lmemcmp_bytewise: - add r2, r2, #0x03 -.Lmemcmp_bytewise2: - ldrb r0, [ip], #0x01 - ldrb r3, [r1], #0x01 - subs r2, r2, #0x01 - cmpcs r0, r3 - beq .Lmemcmp_bytewise2 - sub r0, r0, r3 - RET - -#if defined(_KERNEL) && !defined(_STANDALONE) - /* - * 6 byte compares are very common, thanks to the network stack. - * This code is hand-scheduled to reduce the number of stalls for - * load results. Everything else being equal, this will be ~32% - * faster than a byte-wise memcmp. - */ - .align 5 -.Lmemcmp_6bytes: - ldrb r3, [r1, #0x00] /* r3 = b2#0 */ - ldrb r0, [ip, #0x00] /* r0 = b1#0 */ - ldrb r2, [r1, #0x01] /* r2 = b2#1 */ - subs r0, r0, r3 /* r0 = b1#0 - b2#0 */ - ldreqb r3, [ip, #0x01] /* r3 = b1#1 */ - RETne /* Return if mismatch on #0 */ - subs r0, r3, r2 /* r0 = b1#1 - b2#1 */ - ldreqb r3, [r1, #0x02] /* r3 = b2#2 */ - ldreqb r0, [ip, #0x02] /* r0 = b1#2 */ - RETne /* Return if mismatch on #1 */ - ldrb r2, [r1, #0x03] /* r2 = b2#3 */ - subs r0, r0, r3 /* r0 = b1#2 - b2#2 */ - ldreqb r3, [ip, #0x03] /* r3 = b1#3 */ - RETne /* Return if mismatch on #2 */ - subs r0, r3, r2 /* r0 = b1#3 - b2#3 */ - ldreqb r3, [r1, #0x04] /* r3 = b2#4 */ - ldreqb r0, [ip, #0x04] /* r0 = b1#4 */ - RETne /* Return if mismatch on #3 */ - ldrb r2, [r1, #0x05] /* r2 = b2#5 */ - subs r0, r0, r3 /* r0 = b1#4 - b2#4 */ - ldreqb r3, [ip, #0x05] /* r3 = b1#5 */ - RETne /* Return if mismatch on #4 */ - sub r0, r3, r2 /* r0 = b1#5 - b2#5 */ - RET -#endif |
