linux/arch/sh/lib/ashrsi3.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
Free Software Foundation; either version 2, or (at your option) any
later version.

In addition to the permissions in the GNU General Public License, the
Free Software Foundation gives you unlimited permission to link the
compiled version of this file into combinations with other programs,
and to distribute those combinations without any restriction coming
from the use of this file.  (The General Public License restrictions
do apply in other respects; for example, they cover modification of
the file, and distribution when not linked into a combine
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This file is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

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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  */

!
! __ashrsi3
!
! Entry:
!
! r4: Value to shift
! r5: Shifts
!
! Exit:
!
! r0: Result
!
! Destroys:
!
! (none)
!

	.global	__ashrsi3
	
	.align	2
__ashrsi3:
	mov	#31,r0
	and	r0,r5
	mova	ashrsi3_table,r0
	mov.b	@(r0,r5),r5
#ifdef __sh1__
	add	r5,r0
	jmp	@r0
#else
	braf	r5
#endif
	mov	r4,r0

	.align	2
ashrsi3_table:
	.byte		ashrsi3_0-ashrsi3_table
	.byte		ashrsi3_1-ashrsi3_table
	.byte		ashrsi3_2-ashrsi3_table
	.byte		ashrsi3_3-ashrsi3_table
	.byte		ashrsi3_4-ashrsi3_table
	.byte		ashrsi3_5-ashrsi3_table
	.byte		ashrsi3_6-ashrsi3_table
	.byte		ashrsi3_7-ashrsi3_table
	.byte		ashrsi3_8-ashrsi3_table
	.byte		ashrsi3_9-ashrsi3_table
	.byte		ashrsi3_10-ashrsi3_table
	.byte		ashrsi3_11-ashrsi3_table
	.byte		ashrsi3_12-ashrsi3_table
	.byte		ashrsi3_13-ashrsi3_table
	.byte		ashrsi3_14-ashrsi3_table
	.byte		ashrsi3_15-ashrsi3_table
	.byte		ashrsi3_16-ashrsi3_table
	.byte		ashrsi3_17-ashrsi3_table
	.byte		ashrsi3_18-ashrsi3_table
	.byte		ashrsi3_19-ashrsi3_table
	.byte		ashrsi3_20-ashrsi3_table
	.byte		ashrsi3_21-ashrsi3_table
	.byte		ashrsi3_22-ashrsi3_table
	.byte		ashrsi3_23-ashrsi3_table
	.byte		ashrsi3_24-ashrsi3_table
	.byte		ashrsi3_25-ashrsi3_table
	.byte		ashrsi3_26-ashrsi3_table
	.byte		ashrsi3_27-ashrsi3_table
	.byte		ashrsi3_28-ashrsi3_table
	.byte		ashrsi3_29-ashrsi3_table
	.byte		ashrsi3_30-ashrsi3_table
	.byte		ashrsi3_31-ashrsi3_table

ashrsi3_31:
	rotcl	r0
	rts
	subc	r0,r0

ashrsi3_30:
	shar	r0
ashrsi3_29:
	shar	r0
ashrsi3_28:
	shar	r0
ashrsi3_27:
	shar	r0
ashrsi3_26:
	shar	r0
ashrsi3_25:
	shar	r0
ashrsi3_24:
	shlr16	r0
	shlr8	r0
	rts
	exts.b	r0,r0

ashrsi3_23:
	shar	r0
ashrsi3_22:
	shar	r0
ashrsi3_21:
	shar	r0
ashrsi3_20:
	shar	r0
ashrsi3_19:
	shar	r0
ashrsi3_18:
	shar	r0
ashrsi3_17:
	shar	r0
ashrsi3_16:
	shlr16	r0
	rts
	exts.w	r0,r0

ashrsi3_15:
	shar	r0
ashrsi3_14:
	shar	r0
ashrsi3_13:
	shar	r0
ashrsi3_12:
	shar	r0
ashrsi3_11:
	shar	r0
ashrsi3_10:
	shar	r0
ashrsi3_9:
	shar	r0
ashrsi3_8:
	shar	r0
ashrsi3_7:
	shar	r0
ashrsi3_6:
	shar	r0
ashrsi3_5:
	shar	r0
ashrsi3_4:
	shar	r0
ashrsi3_3:
	shar	r0
ashrsi3_2:
	shar	r0
ashrsi3_1:
	rts
	shar	r0

ashrsi3_0:
	rts
	nop