From: Stefan Liebler <stli@linux.vnet.ibm.com>
Date: Tue, 24 May 2016 08:39:13 +0000 (+0200)
Subject: S390: Use mvcle for copies > 1MB on 32bit with default memcpy variant.
X-Git-Tag: glibc-2.24~223
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=04bb21ac93e90d7696bcaf8febe2b2dd2d83585a;p=thirdparty%2Fglibc.git

S390: Use mvcle for copies > 1MB on 32bit with default memcpy variant.

If more than 255 bytes should be copied, the algorithm jumps away.
Before this patch, it jumps to the mvc-loop (.L_G5_12).
Now it jumps first to the "> 1MB" check, which jumps away to
__memcpy_mvcle. Otherwise, the mvc-loop (.L_G5_12) copies the bytes.

ChangeLog:

	* sysdeps/s390/s390-32/memcpy.S (memcpy):
	Jump to 1MB check before executing mvc-loop.
---

diff --git a/ChangeLog b/ChangeLog
index 2b51267194c..d2b34a84786 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2016-05-24  Stefan Liebler  <stli@linux.vnet.ibm.com>
+
+	* sysdeps/s390/s390-32/memcpy.S (memcpy):
+	Jump to 1MB check before executing mvc-loop.
+
 2016-05-24  Florian Weimer  <fweimer@redhat.com>
 
 	[BZ #6527]
diff --git a/sysdeps/s390/s390-32/memcpy.S b/sysdeps/s390/s390-32/memcpy.S
index 62ecbbf6190..2ac51ab62ed 100644
--- a/sysdeps/s390/s390-32/memcpy.S
+++ b/sysdeps/s390/s390-32/memcpy.S
@@ -42,7 +42,7 @@ ENTRY(memcpy)
 	srl     %r5,8
 	ltr     %r5,%r5
 	lr      %r1,%r2
-	jne     .L_G5_12
+	jne     .L_G5_13
 	ex      %r4,.L_G5_17-.L_G5_16(%r13)
 .L_G5_4:
 	l       %r13,52(%r15)