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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sh/lib/udivsi3.S
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/* SPDX-License-Identifier: GPL-2.0+ WITH GCC-exception-2.0

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   Copyright (C) 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003,

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   2004, 2005

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   Free Software Foundation, Inc.

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*/

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!! libgcc routines for the Renesas / SuperH SH CPUs.

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!! Contributed by Steve Chamberlain.

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!! sac@cygnus.com

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	.balign 4

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	.global	__udivsi3

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	.type	__udivsi3, @function

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div8:

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	div1 r5,r4

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div7:

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	div1 r5,r4; div1 r5,r4; div1 r5,r4

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	div1 r5,r4; div1 r5,r4; div1 r5,r4; rts; div1 r5,r4

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divx4:

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	div1 r5,r4; rotcl r0

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	div1 r5,r4; rotcl r0

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	div1 r5,r4; rotcl r0

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	rts; div1 r5,r4

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__udivsi3:

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	sts.l pr,@-r15

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	extu.w r5,r0

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	cmp/eq r5,r0

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	bf/s large_divisor

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	div0u

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	swap.w r4,r0

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	shlr16 r4

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	bsr div8

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	shll16 r5

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	bsr div7

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	div1 r5,r4

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	xtrct r4,r0

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	xtrct r0,r4

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	bsr div8

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	swap.w r4,r4

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	bsr div7

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	div1 r5,r4

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	lds.l @r15+,pr

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	xtrct r4,r0

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	swap.w r0,r0

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	rotcl r0

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	rts

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	shlr16 r5

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large_divisor:

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	mov #0,r0

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	xtrct r4,r0

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	xtrct r0,r4

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	bsr divx4

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	rotcl r0

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	bsr divx4

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	rotcl r0

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	bsr divx4

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	rotcl r0

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	bsr divx4

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	rotcl r0

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	lds.l @r15+,pr

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	rts

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	rotcl r0

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