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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arc/lib/memset.S
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/* 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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#include <linux/linkage.h>

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#define SMALL	7 /* Must be at least 6 to deal with alignment/loop issues.  */

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ENTRY_CFI(memset)

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	mov_s	r4,r0

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	or	r12,r0,r2

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	bmsk.f	r12,r12,1

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	extb_s	r1,r1

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	asl	r3,r1,8

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	beq.d	.Laligned

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	or_s	r1,r1,r3

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	brls	r2,SMALL,.Ltiny

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	add	r3,r2,r0

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	stb	r1,[r3,-1]

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	bclr_s	r3,r3,0

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	stw	r1,[r3,-2]

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	bmsk.f	r12,r0,1

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	add_s	r2,r2,r12

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	sub.ne	r2,r2,4

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	stb.ab	r1,[r4,1]

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	and	r4,r4,-2

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	stw.ab	r1,[r4,2]

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	and	r4,r4,-4

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.Laligned:	; This code address should be aligned for speed.

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	asl	r3,r1,16

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	lsr.f	lp_count,r2,2

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	or_s	r1,r1,r3

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	lpne	.Loop_end

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	st.ab	r1,[r4,4]

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.Loop_end:

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	j_s	[blink]

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	.balign	4

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.Ltiny:

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	mov.f	lp_count,r2

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	lpne	.Ltiny_end

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	stb.ab	r1,[r4,1]

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.Ltiny_end:

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	j_s	[blink]

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END_CFI(memset)

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; memzero: @r0 = mem, @r1 = size_t

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; memset:  @r0 = mem, @r1 = char, @r2 = size_t

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ENTRY_CFI(memzero)

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    ; adjust bzero args to memset args

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    mov r2, r1

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    mov r1, 0

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    b  memset    ;tail call so need to tinker with blink

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END_CFI(memzero)

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