From 853c253e2d3c682910f83a7d0a920c0cd3b8e354 Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@redhat.com>
Date: Tue, 14 Apr 2009 22:25:37 +0000
Subject: [PATCH] mpn_rshift for x86-64.

---
 sysdeps/x86_64/rshift.S | 62 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 sysdeps/x86_64/rshift.S

diff --git a/sysdeps/x86_64/rshift.S b/sysdeps/x86_64/rshift.S
new file mode 100644
index 0000000000..ee0c8aa15c
--- /dev/null
+++ b/sysdeps/x86_64/rshift.S
@@ -0,0 +1,62 @@
+/* AMD64 __mpn_rshift --
+   Copyright (C) 2004, 2006 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. */
+
+#include "sysdep.h"
+#include "asm-syntax.h"
+
+	.text
+ENTRY (__mpn_rshift)
+	movq	(%rsi), %mm7
+	movd	%ecx, %mm1
+	movl	$64, %eax
+	subl	%ecx, %eax
+	movd	%eax, %mm0
+	movq	%mm7, %mm3
+	psllq	%mm0, %mm7
+	movd	%mm7, %rax
+	leaq	(%rsi,%rdx,8), %rsi
+	leaq	(%rdi,%rdx,8), %rdi
+	negq	%rdx
+	addq	$2, %rdx
+	jg	L(endo)
+	.p2align 2
+L(loop):
+	movq	-8(%rsi,%rdx,8), %mm6
+	movq	%mm6, %mm2
+	psllq	%mm0, %mm6
+	psrlq	%mm1, %mm3
+	por	%mm6, %mm3
+	movq	%mm3, -16(%rdi,%rdx,8)
+	je	L(ende)
+	movq	(%rsi,%rdx,8), %mm7
+	movq	%mm7, %mm3
+	psllq	%mm0, %mm7
+	psrlq	%mm1, %mm2
+	por	%mm7, %mm2
+	movq	%mm2, -8(%rdi,%rdx,8)
+	addq	$2, %rdx
+	jle	L(loop)
+L(endo):
+	movq	%mm3, %mm2
+L(ende):
+	psrlq	%mm1, %mm2
+	movq	%mm2, -8(%rdi)
+	emms
+	ret
+END (__mpn_rshift)
-- 
2.11.4.GIT