CooCenter-System-kernel/arch/sh/lib/lshrsi3.S

/* Copyright (C) 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   2004, 2005, 2006
   Free Software Foundation, Inc.

This file is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
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later version.

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compiled version of this file into combinations with other programs,
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do apply in other respects; for example, they cover modification of
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WITHOUT ANY WARRANTY; without even the implied warranty of
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!! libgcc routines for the Renesas / SuperH SH CPUs.
!! Contributed by Steve Chamberlain.
!! sac@cygnus.com

!! ashiftrt_r4_x, ___ashrsi3, ___ashlsi3, ___lshrsi3 routines
!! recoded in assembly by Toshiyasu Morita
!! tm@netcom.com

/* SH2 optimizations for ___ashrsi3, ___ashlsi3, ___lshrsi3 and
   ELF local label prefixes by J"orn Rennecke
   amylaar@cygnus.com  */

!
! __lshrsi3
!
! Entry:
!
! r4: Value to shift
! r5: Shifts
!
! Exit:
!
! r0: Result
!
! Destroys:
!
! (none)
!
! __lshrsi3_r0
!
! Entry:
!
! r0: Value to shift
! r5: Shifts
!
! Exit:
!
! r0: Result
!
! Destroys:
!
! (none)
!
	.global	__lshrsi3
	.global	__lshrsi3_r0
	
	.align	2
__lshrsi3:
	mov	r5,r0
	.align	2
__lshrsi3_r0:
	and	#31,r0
	mov.l	r4,@-r15
	mov	r0,r4
	mova	lshrsi3_table,r0
	mov.b	@(r0,r4),r4
	add	r4,r0
	jmp	@r0
	mov.l	@r15+,r0

	.align	2
lshrsi3_table:
	.byte		lshrsi3_0-lshrsi3_table
	.byte		lshrsi3_1-lshrsi3_table
	.byte		lshrsi3_2-lshrsi3_table
	.byte		lshrsi3_3-lshrsi3_table
	.byte		lshrsi3_4-lshrsi3_table
	.byte		lshrsi3_5-lshrsi3_table
	.byte		lshrsi3_6-lshrsi3_table
	.byte		lshrsi3_7-lshrsi3_table
	.byte		lshrsi3_8-lshrsi3_table
	.byte		lshrsi3_9-lshrsi3_table
	.byte		lshrsi3_10-lshrsi3_table
	.byte		lshrsi3_11-lshrsi3_table
	.byte		lshrsi3_12-lshrsi3_table
	.byte		lshrsi3_13-lshrsi3_table
	.byte		lshrsi3_14-lshrsi3_table
	.byte		lshrsi3_15-lshrsi3_table
	.byte		lshrsi3_16-lshrsi3_table
	.byte		lshrsi3_17-lshrsi3_table
	.byte		lshrsi3_18-lshrsi3_table
	.byte		lshrsi3_19-lshrsi3_table
	.byte		lshrsi3_20-lshrsi3_table
	.byte		lshrsi3_21-lshrsi3_table
	.byte		lshrsi3_22-lshrsi3_table
	.byte		lshrsi3_23-lshrsi3_table
	.byte		lshrsi3_24-lshrsi3_table
	.byte		lshrsi3_25-lshrsi3_table
	.byte		lshrsi3_26-lshrsi3_table
	.byte		lshrsi3_27-lshrsi3_table
	.byte		lshrsi3_28-lshrsi3_table
	.byte		lshrsi3_29-lshrsi3_table
	.byte		lshrsi3_30-lshrsi3_table
	.byte		lshrsi3_31-lshrsi3_table

lshrsi3_6:
	shlr2	r0
lshrsi3_4:
	shlr2	r0
lshrsi3_2:
	rts
	shlr2	r0

lshrsi3_7:
	shlr2	r0
lshrsi3_5:
	shlr2	r0
lshrsi3_3:
	shlr2	r0
lshrsi3_1:
	rts
	shlr	r0

lshrsi3_14:
	shlr2	r0
lshrsi3_12:
	shlr2	r0
lshrsi3_10:
	shlr2	r0
lshrsi3_8:
	rts
	shlr8	r0

lshrsi3_15:
	shlr2	r0
lshrsi3_13:
	shlr2	r0
lshrsi3_11:
	shlr2	r0
lshrsi3_9:
	shlr8	r0
	rts
	shlr	r0

lshrsi3_22:
	shlr2	r0
lshrsi3_20:
	shlr2	r0
lshrsi3_18:
	shlr2	r0
lshrsi3_16:
	rts
	shlr16	r0

lshrsi3_23:
	shlr2	r0
lshrsi3_21:
	shlr2	r0
lshrsi3_19:
	shlr2	r0
lshrsi3_17:
	shlr16	r0
	rts
	shlr	r0

lshrsi3_30:
	shlr2	r0
lshrsi3_28:
	shlr2	r0
lshrsi3_26:
	shlr2	r0
lshrsi3_24:
	shlr16	r0
	rts
	shlr8	r0

lshrsi3_31:
	shlr2	r0
lshrsi3_29:
	shlr2	r0
lshrsi3_27:
	shlr2	r0
lshrsi3_25:
	shlr16	r0
	shlr8	r0
	rts
	shlr	r0

lshrsi3_0:
	rts
	nop