From ba848785bb048e7700555ef97c9d1fd3911a3da3 Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@gnu.org>
Date: Mon, 4 Dec 1995 18:37:56 +0000
Subject: Updated from ../=mpn/gmp-1.910

---
 sysdeps/i386/i586/rshift.S | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

(limited to 'sysdeps/i386/i586/rshift.S')

diff --git a/sysdeps/i386/i586/rshift.S b/sysdeps/i386/i586/rshift.S
index 51cde8f07f..a820a79bc7 100644
--- a/sysdeps/i386/i586/rshift.S
+++ b/sysdeps/i386/i586/rshift.S
@@ -43,12 +43,15 @@ C_SYMBOL_NAME(__mpn_rshift:)
 	movl	28(%esp),%ebp		/* size */
 	movl	32(%esp),%ecx		/* cnt */
 
+/* We can use faster code for shift-by-1 under certain conditions.  */
 	cmp	$1,%ecx
 	jne	Lnormal
-	movl	%edi,%eax
-	subl	%esi,%eax
-	cmpl	%ebp,%eax
-	jnc	Lspecial
+	leal	4(%edi),%eax
+	cmpl	%esi,%eax
+	jnc	Lspecial		/* jump if res_ptr + 1 >= s_ptr */
+	leal	(%edi,%ebp,4),%eax
+	cmpl	%eax,%esi
+	jnc	Lspecial		/* jump if s_ptr >= res_ptr + size */
 
 Lnormal:
 	movl	(%esi),%edx
-- 
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