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strcpy.c
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strlen.S
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Editing: strlen.S
/* Copyright (c) 2010-2011,2013 Linaro Limited All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * 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. * Neither the name of Linaro Limited nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT HOLDER OR CONTRIBUTORS 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. */ /* Assumes: ARMv6T2, AArch32 */ .macro def_fn f p2align=0 .text .p2align \p2align .global \f .type \f, %function \f: .endm #ifdef __ARMEB__ #define S2LO lsl #define S2HI lsr #else #define S2LO lsr #define S2HI lsl #endif /* This code requires Thumb. */ .thumb .syntax unified /* Parameters and result. */ #define srcin r0 #define result r0 /* Internal variables. */ #define src r1 #define data1a r2 #define data1b r3 #define const_m1 r12 #define const_0 r4 #define tmp1 r4 /* Overlaps const_0 */ #define tmp2 r5 def_fn strlen p2align=6 pld [srcin, #0] strd r4, r5, [sp, #-8]! bic src, srcin, #7 mvn const_m1, #0 ands tmp1, srcin, #7 /* (8 - bytes) to alignment. */ pld [src, #32] bne.w .Lmisaligned8 mov const_0, #0 mov result, #-8 .Lloop_aligned: /* Bytes 0-7. */ ldrd data1a, data1b, [src] pld [src, #64] add result, result, #8 .Lstart_realigned: uadd8 data1a, data1a, const_m1 /* Saturating GE<0:3> set. */ sel data1a, const_0, const_m1 /* Select based on GE<0:3>. */ uadd8 data1b, data1b, const_m1 sel data1b, data1a, const_m1 /* Only used if d1a == 0. */ cbnz data1b, .Lnull_found /* Bytes 8-15. */ ldrd data1a, data1b, [src, #8] uadd8 data1a, data1a, const_m1 /* Saturating GE<0:3> set. */ add result, result, #8 sel data1a, const_0, const_m1 /* Select based on GE<0:3>. */ uadd8 data1b, data1b, const_m1 sel data1b, data1a, const_m1 /* Only used if d1a == 0. */ cbnz data1b, .Lnull_found /* Bytes 16-23. */ ldrd data1a, data1b, [src, #16] uadd8 data1a, data1a, const_m1 /* Saturating GE<0:3> set. */ add result, result, #8 sel data1a, const_0, const_m1 /* Select based on GE<0:3>. */ uadd8 data1b, data1b, const_m1 sel data1b, data1a, const_m1 /* Only used if d1a == 0. */ cbnz data1b, .Lnull_found /* Bytes 24-31. */ ldrd data1a, data1b, [src, #24] add src, src, #32 uadd8 data1a, data1a, const_m1 /* Saturating GE<0:3> set. */ add result, result, #8 sel data1a, const_0, const_m1 /* Select based on GE<0:3>. */ uadd8 data1b, data1b, const_m1 sel data1b, data1a, const_m1 /* Only used if d1a == 0. */ cmp data1b, #0 beq .Lloop_aligned .Lnull_found: cmp data1a, #0 itt eq addeq result, result, #4 moveq data1a, data1b #ifndef __ARMEB__ rev data1a, data1a #endif clz data1a, data1a ldrd r4, r5, [sp], #8 add result, result, data1a, lsr #3 /* Bits -> Bytes. */ bx lr .Lmisaligned8: ldrd data1a, data1b, [src] and tmp2, tmp1, #3 rsb result, tmp1, #0 lsl tmp2, tmp2, #3 /* Bytes -> bits. */ tst tmp1, #4 pld [src, #64] S2HI tmp2, const_m1, tmp2 orn data1a, data1a, tmp2 itt ne ornne data1b, data1b, tmp2 movne data1a, const_m1 mov const_0, #0 b .Lstart_realigned .size strlen, . - strlen
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