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arch/arc/lib/strlen.S
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/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
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*/ |
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#include <linux/linkage.h> |
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ENTRY_CFI(strlen) |
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or r3,r0,7 ld r2,[r3,-7] ld.a r6,[r3,-3] mov r4,0x01010101 ; uses long immediate #ifdef __LITTLE_ENDIAN__ asl_s r1,r0,3 btst_s r0,2 asl r7,r4,r1 ror r5,r4 sub r1,r2,r7 bic_s r1,r1,r2 mov.eq r7,r4 sub r12,r6,r7 bic r12,r12,r6 or.eq r12,r12,r1 and r12,r12,r5 brne r12,0,.Learly_end #else /* BIG ENDIAN */ ror r5,r4 btst_s r0,2 mov_s r1,31 sub3 r7,r1,r0 sub r1,r2,r4 bic_s r1,r1,r2 bmsk r1,r1,r7 sub r12,r6,r4 bic r12,r12,r6 bmsk.ne r12,r12,r7 or.eq r12,r12,r1 and r12,r12,r5 brne r12,0,.Learly_end #endif /* ENDIAN */ .Loop: ld_s r2,[r3,4] ld.a r6,[r3,8] ; stall for load result sub r1,r2,r4 bic_s r1,r1,r2 sub r12,r6,r4 bic r12,r12,r6 or r12,r12,r1 and r12,r12,r5 breq r12,0,.Loop .Lend: and.f r1,r1,r5 sub.ne r3,r3,4 mov.eq r1,r12 #ifdef __LITTLE_ENDIAN__ sub_s r2,r1,1 bic_s r2,r2,r1 norm r1,r2 sub_s r0,r0,3 lsr_s r1,r1,3 sub r0,r3,r0 j_s.d [blink] sub r0,r0,r1 #else /* BIG ENDIAN */ lsr_s r1,r1,7 mov.eq r2,r6 bic_s r1,r1,r2 norm r1,r1 sub r0,r3,r0 lsr_s r1,r1,3 j_s.d [blink] add r0,r0,r1 #endif /* ENDIAN */ .Learly_end: b.d .Lend sub_s.ne r1,r1,r1 |
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END_CFI(strlen) |