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| /*
| * Copyright (C) 2004, 2007-2010, 2011-2014 Synopsys, Inc. All rights reserved.
| *
| * SPDX-License-Identifier: GPL-2.0+
| */
|
| /*
| * If dst and src are 4 byte aligned, copy 8 bytes at a time.
| * If the src is 4, but not 8 byte aligned, we first read 4 bytes to get
| * it 8 byte aligned. Thus, we can do a little read-ahead, without
| * dereferencing a cache line that we should not touch.
| * Note that short and long instructions have been scheduled to avoid
| * branch stalls.
| * The beq_s to r3z could be made unaligned & long to avoid a stall
| * there, but it is not likely to be taken often, and it would also be likely
| * to cost an unaligned mispredict at the next call.
| */
|
| .global strcpy
| .align 4
| strcpy:
| or %r2, %r0, %r1
| bmsk_s %r2, %r2, 1
| brne.d %r2, 0, charloop
| mov_s %r10, %r0
| ld_s %r3, [%r1, 0]
| mov %r8, 0x01010101
| bbit0.d %r1, 2, loop_start
| ror %r12, %r8
| sub %r2, %r3, %r8
| bic_s %r2, %r2, %r3
| tst_s %r2,%r12
| bne r3z
| mov_s %r4,%r3
| .balign 4
| loop:
| ld.a %r3, [%r1, 4]
| st.ab %r4, [%r10, 4]
| loop_start:
| ld.a %r4, [%r1, 4]
| sub %r2, %r3, %r8
| bic_s %r2, %r2, %r3
| tst_s %r2, %r12
| bne_s r3z
| st.ab %r3, [%r10, 4]
| sub %r2, %r4, %r8
| bic %r2, %r2, %r4
| tst %r2, %r12
| beq loop
| mov_s %r3, %r4
| #ifdef __LITTLE_ENDIAN__
| r3z: bmsk.f %r1, %r3, 7
| lsr_s %r3, %r3, 8
| #else /* __BIG_ENDIAN__ */
| r3z: lsr.f %r1, %r3, 24
| asl_s %r3, %r3, 8
| #endif /* _ENDIAN__ */
| bne.d r3z
| stb.ab %r1, [%r10, 1]
| j_s [%blink]
|
| .balign 4
| charloop:
| ldb.ab %r3, [%r1, 1]
| brne.d %r3, 0, charloop
| stb.ab %r3, [%r10, 1]
| j [%blink]
|
|
