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67 lines
1.4 KiB
67 lines
1.4 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
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*/ |
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/* If dst and src are 4 byte aligned, copy 8 bytes at a time. |
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If the src is 4, but not 8 byte aligned, we first read 4 bytes to get |
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it 8 byte aligned. Thus, we can do a little read-ahead, without |
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dereferencing a cache line that we should not touch. |
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Note that short and long instructions have been scheduled to avoid |
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branch stalls. |
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The beq_s to r3z could be made unaligned & long to avoid a stall |
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there, but the it is not likely to be taken often, and it |
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would also be likey to cost an unaligned mispredict at the next call. */ |
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#include <linux/linkage.h> |
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ENTRY_CFI(strcpy) |
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or r2,r0,r1 |
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bmsk_s r2,r2,1 |
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brne.d r2,0,charloop |
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mov_s r10,r0 |
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ld_s r3,[r1,0] |
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mov r8,0x01010101 |
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bbit0.d r1,2,loop_start |
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ror r12,r8 |
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sub r2,r3,r8 |
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bic_s r2,r2,r3 |
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tst_s r2,r12 |
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bne r3z |
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mov_s r4,r3 |
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.balign 4 |
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loop: |
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ld.a r3,[r1,4] |
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st.ab r4,[r10,4] |
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loop_start: |
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ld.a r4,[r1,4] |
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sub r2,r3,r8 |
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bic_s r2,r2,r3 |
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tst_s r2,r12 |
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bne_s r3z |
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st.ab r3,[r10,4] |
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sub r2,r4,r8 |
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bic r2,r2,r4 |
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tst r2,r12 |
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beq loop |
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mov_s r3,r4 |
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#ifdef __LITTLE_ENDIAN__ |
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r3z: bmsk.f r1,r3,7 |
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lsr_s r3,r3,8 |
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#else |
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r3z: lsr.f r1,r3,24 |
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asl_s r3,r3,8 |
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#endif |
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bne.d r3z |
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stb.ab r1,[r10,1] |
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j_s [blink] |
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.balign 4 |
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charloop: |
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ldb.ab r3,[r1,1] |
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brne.d r3,0,charloop |
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stb.ab r3,[r10,1] |
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j [blink] |
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END_CFI(strcpy)
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