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aeabi_idiv.S
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strcmp-armv6m.S
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Editing: strcmp-armv6m.S
/* * Copyright (c) 2014 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. */ /* Implementation of strcmp for ARMv6m. This version is only used in ARMv6-M when we want an efficient implementation. Otherwize if the code size is preferred, strcmp-armv4t.S will be used. */ .thumb_func .syntax unified .arch armv6-m .macro DoSub n, label subs r0, r0, r1 #ifdef __ARM_BIG_ENDIAN lsrs r1, r4, \n #else lsls r1, r4, \n #endif orrs r1, r0 bne \label .endm .macro Byte_Test n, label lsrs r0, r2, \n lsrs r1, r3, \n DoSub \n, \label .endm .text .p2align 0 .global strcmp .type strcmp, %function strcmp: .cfi_startproc mov r2, r0 push {r4, r5, r6, lr} orrs r2, r1 lsls r2, r2, #30 bne 6f ldr r5, =0x01010101 lsls r6, r5, #7 1: ldmia r0!, {r2} ldmia r1!, {r3} subs r4, r2, r5 bics r4, r2 ands r4, r6 beq 3f #ifdef __ARM_BIG_ENDIAN Byte_Test #24, 4f Byte_Test #16, 4f Byte_Test #8, 4f b 7f 3: cmp r2, r3 beq 1b cmp r2, r3 #else uxtb r0, r2 uxtb r1, r3 DoSub #24, 2f uxth r0, r2 uxth r1, r3 DoSub #16, 2f lsls r0, r2, #8 lsls r1, r3, #8 lsrs r0, r0, #8 lsrs r1, r1, #8 DoSub #8, 2f lsrs r0, r2, #24 lsrs r1, r3, #24 subs r0, r0, r1 2: pop {r4, r5, r6, pc} 3: cmp r2, r3 beq 1b rev r0, r2 rev r1, r3 cmp r0, r1 #endif bls 5f movs r0, #1 4: pop {r4, r5, r6, pc} 5: movs r0, #0 mvns r0, r0 pop {r4, r5, r6, pc} 6: ldrb r2, [r0, #0] ldrb r3, [r1, #0] adds r0, #1 adds r1, #1 cmp r2, #0 beq 7f cmp r2, r3 bne 7f ldrb r2, [r0, #0] ldrb r3, [r1, #0] adds r0, #1 adds r1, #1 cmp r2, #0 beq 7f cmp r2, r3 beq 6b 7: subs r0, r2, r3 pop {r4, r5, r6, pc} .cfi_endproc .size strcmp, . - strcmp
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