Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 167 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/m68k/m680x0/rshift.S b/REORG.TODO/sysdeps/m68k/m680x0/rshift.S
new file mode 100644
index 0000000000..911179a273
--- /dev/null
+++ b/REORG.TODO/sysdeps/m68k/m680x0/rshift.S
@@ -0,0 +1,167 @@
+/* mc68020 __mpn_rshift -- Shift right a low-level natural-number integer.
+
+Copyright (C) 1996-2017 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.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/*
+  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)
+	cfi_adjust_cfa_offset (6*4)
+	cfi_rel_offset (R(d2), 0)
+	cfi_rel_offset (R(d3), 4)
+	cfi_rel_offset (R(d4), 8)
+	cfi_rel_offset (R(d5), 12)
+	cfi_rel_offset (R(d6), 16)
+	cfi_rel_offset (R(a2), 20)
+
+/* 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)
+	cfi_remember_state
+	cfi_adjust_cfa_offset (-6*4)
+	cfi_restore (R(d2))
+	cfi_restore (R(d3))
+	cfi_restore (R(d4))
+	cfi_restore (R(d5))
+	cfi_restore (R(d6))
+	cfi_restore (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.  */
+
+	cfi_restore_state
+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)
+	cfi_adjust_cfa_offset (-6*4)
+	cfi_restore (R(d2))
+	cfi_restore (R(d3))
+	cfi_restore (R(d4))
+	cfi_restore (R(d5))
+	cfi_restore (R(d6))
+	cfi_restore (R(a2))
+	rts
+END(__mpn_rshift)