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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /sysdeps/m68k/rshift.S
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
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2.5-18.1
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diff --git a/sysdeps/m68k/rshift.S b/sysdeps/m68k/rshift.S
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-/* mc68020 __mpn_rshift -- Shift right a low-level natural-number integer.
-
-Copyright (C) 1996, 1998 Free Software Foundation, Inc.
-
-This file is part of the GNU MP Library.
-
-The GNU MP Library is free software; you can redistribute it and/or modify
-it under the terms of the GNU Lesser General Public License as published by
-the Free Software Foundation; either version 2.1 of the License, or (at your
-option) any later version.
-
-The GNU MP Library 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 Lesser General Public
-License for more details.
-
-You should have received a copy of the GNU Lesser General Public License
-along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
-the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
-MA 02111-1307, USA. */
-
-/*
-  INPUT PARAMETERS
-  res_ptr	(sp + 4)
-  s_ptr		(sp + 8)
-  s_size	(sp + 16)
-  cnt		(sp + 12)
-*/
-
-#include "sysdep.h"
-#include "asm-syntax.h"
-
-#define res_ptr a1
-#define s_ptr a0
-#define s_size d6
-#define cnt d4
-
-	TEXT
-ENTRY(__mpn_rshift)
-/* Save used registers on the stack.  */
-	moveml	R(d2)-R(d6)/R(a2),MEM_PREDEC(sp)
-
-/* Copy the arguments to registers.  */
-	movel	MEM_DISP(sp,28),R(res_ptr)
-	movel	MEM_DISP(sp,32),R(s_ptr)
-	movel	MEM_DISP(sp,36),R(s_size)
-	movel	MEM_DISP(sp,40),R(cnt)
-
-	moveql	#1,R(d5)
-	cmpl	R(d5),R(cnt)
-	bne	L(Lnormal)
-	cmpl	R(res_ptr),R(s_ptr)
-	bls	L(Lspecial)		/* jump if res_ptr >= s_ptr */
-#if (defined (__mc68020__) || defined (__NeXT__) || defined(mc68020))
-	lea	MEM_INDX1(res_ptr,s_size,l,4),R(a2)
-#else /* not mc68020 */
-	movel	R(s_size),R(d0)
-	asll	#2,R(d0)
-	lea	MEM_INDX(res_ptr,d0,l),R(a2)
-#endif
-	cmpl	R(s_ptr),R(a2)
-	bls	L(Lspecial)		/* jump if s_ptr >= res_ptr + s_size */
-
-L(Lnormal:)
-	moveql	#32,R(d5)
-	subl	R(cnt),R(d5)
-	movel	MEM_POSTINC(s_ptr),R(d2)
-	movel	R(d2),R(d0)
-	lsll	R(d5),R(d0)		/* compute carry limb */
-
-	lsrl	R(cnt),R(d2)
-	movel	R(d2),R(d1)
-	subql	#1,R(s_size)
-	beq	L(Lend)
-	lsrl	#1,R(s_size)
-	bcs	L(L1)
-	subql	#1,R(s_size)
-
-L(Loop:)
-	movel	MEM_POSTINC(s_ptr),R(d2)
-	movel	R(d2),R(d3)
-	lsll	R(d5),R(d3)
-	orl	R(d3),R(d1)
-	movel	R(d1),MEM_POSTINC(res_ptr)
-	lsrl	R(cnt),R(d2)
-L(L1:)
-	movel	MEM_POSTINC(s_ptr),R(d1)
-	movel	R(d1),R(d3)
-	lsll	R(d5),R(d3)
-	orl	R(d3),R(d2)
-	movel	R(d2),MEM_POSTINC(res_ptr)
-	lsrl	R(cnt),R(d1)
-
-	dbf	R(s_size),L(Loop)
-	subl	#0x10000,R(s_size)
-	bcc	L(Loop)
-
-L(Lend:)
-	movel	R(d1),MEM(res_ptr) /* store most significant limb */
-
-/* Restore used registers from stack frame.  */
-	moveml	MEM_POSTINC(sp),R(d2)-R(d6)/R(a2)
-	rts
-
-/* We loop from most significant end of the arrays, which is only
-   permissible if the source and destination don't overlap, since the
-   function is documented to work for overlapping source and destination.  */
-
-L(Lspecial:)
-#if (defined (__mc68020__) || defined (__NeXT__) || defined(mc68020))
-	lea	MEM_INDX1(s_ptr,s_size,l,4),R(s_ptr)
-	lea	MEM_INDX1(res_ptr,s_size,l,4),R(res_ptr)
-#else /* not mc68000 */
-	movel	R(s_size),R(d0)
-	asll	#2,R(d0)
-	addl	R(s_size),R(s_ptr)
-	addl	R(s_size),R(res_ptr)
-#endif
-
-	clrl	R(d0)			/* initialize carry */
-	eorw	#1,R(s_size)
-	lsrl	#1,R(s_size)
-	bcc	L(LL1)
-	subql	#1,R(s_size)
-
-L(LLoop:)
-	movel	MEM_PREDEC(s_ptr),R(d2)
-	roxrl	#1,R(d2)
-	movel	R(d2),MEM_PREDEC(res_ptr)
-L(LL1:)
-	movel	MEM_PREDEC(s_ptr),R(d2)
-	roxrl	#1,R(d2)
-	movel	R(d2),MEM_PREDEC(res_ptr)
-
-	dbf	R(s_size),L(LLoop)
-	roxrl	#1,R(d0)		/* save cy in msb */
-	subl	#0x10000,R(s_size)
-	bcs	L(LLend)
-	addl	R(d0),R(d0)		/* restore cy */
-	bra	L(LLoop)
-
-L(LLend:)
-/* Restore used registers from stack frame.  */
-	moveml	MEM_POSTINC(sp),R(d2)-R(d6)/R(a2)
-	rts
-END(__mpn_rshift)