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, 114 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/x86_64/rshift.S b/REORG.TODO/sysdeps/x86_64/rshift.S
new file mode 100644
index 0000000000..1686339e5c
--- /dev/null
+++ b/REORG.TODO/sysdeps/x86_64/rshift.S
@@ -0,0 +1,114 @@
+/* x86-64 __mpn_rshift --
+   Copyright (C) 2007-2017 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; see the file COPYING.LIB.  If not,
+   see <http://www.gnu.org/licenses/>.  */
+
+#include "sysdep.h"
+#include "asm-syntax.h"
+
+#define rp	%rdi
+#define up	%rsi
+#define n	%rdx
+#define cnt	%cl
+
+	.text
+ENTRY (__mpn_rshift)
+	mov	%edx, %eax
+	and	$3, %eax
+	jne	L(nb00)
+L(b00):	/* n = 4, 8, 12, ... */
+	mov	(up), %r10
+	mov	8(up), %r11
+	xor	%eax, %eax
+	shrd	%cl, %r10, %rax
+	mov	16(up), %r8
+	lea	8(up), up
+	lea	-24(rp), rp
+	sub	$4, n
+	jmp	L(00)
+
+L(nb00):/* n = 1, 5, 9, ... */
+	cmp	$2, %eax
+	jae	L(nb01)
+L(b01):	mov	(up), %r9
+	xor	%eax, %eax
+	shrd	%cl, %r9, %rax
+	sub	$2, n
+	jb	L(le1)
+	mov	8(up), %r10
+	mov	16(up), %r11
+	lea	16(up), up
+	lea	-16(rp), rp
+	jmp	L(01)
+L(le1): shr	%cl, %r9
+	mov	%r9, (rp)
+	ret
+
+L(nb01):/* n = 2, 6, 10, ... */
+	jne	L(b11)
+L(b10):	mov	(up), %r8
+	mov	8(up), %r9
+	xor	%eax, %eax
+	shrd	%cl, %r8, %rax
+	sub	$3, n
+	jb	L(le2)
+	mov	16(up), %r10
+	lea	24(up), up
+	lea	-8(rp), rp
+	jmp	L(10)
+L(le2): shrd	%cl, %r9, %r8
+	mov	%r8, (rp)
+	shr	%cl, %r9
+	mov	%r9, 8(rp)
+	ret
+
+	.p2align 4
+L(b11):	/* n = 3, 7, 11, ... */
+	mov	(up), %r11
+	mov	8(up), %r8
+	xor	%eax, %eax
+	shrd	%cl, %r11, %rax
+	mov	16(up), %r9
+	lea	32(up), up
+	sub	$4, n
+	jb	L(end)
+
+	.p2align 4
+L(top):	shrd	%cl, %r8, %r11
+	mov	-8(up), %r10
+	mov	%r11, (rp)
+L(10):	shrd	%cl, %r9, %r8
+	mov	(up), %r11
+	mov	%r8, 8(rp)
+L(01):	shrd	%cl, %r10, %r9
+	mov	8(up), %r8
+	mov	%r9, 16(rp)
+L(00):	shrd	%cl, %r11, %r10
+	mov	16(up), %r9
+	mov	%r10, 24(rp)
+	add	$32, up
+	lea	32(rp), rp
+	sub	$4, n
+	jnc	L(top)
+
+L(end):	shrd	%cl, %r8, %r11
+	mov	%r11, (rp)
+	shrd	%cl, %r9, %r8
+	mov	%r8, 8(rp)
+	shr	%cl, %r9
+	mov	%r9, 16(rp)
+	ret
+END (__mpn_rshift)