/*
   * 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]