S390: Use 64bit instruction to check for copies of > 1MB with mvcle.

The __memcpy_default variant on s390 64bit calculates the number of
256byte blocks in a 64bit register and checks, if they exceed 1MB
to jump to mvcle. Otherwise a mvc-loop is used. The compare-instruction
only checks a 32bit value.
This patch uses a 64bit compare.

ChangeLog:

	* sysdeps/s390/s390-64/memcpy.S (memcpy):
	Use cghi instead of chi to compare 64bit value.

1 files changed, 5 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index d2b34a8478..1bacd7172e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2016-05-24  Stefan Liebler  <stli@linux.vnet.ibm.com>
 
+	* sysdeps/s390/s390-64/memcpy.S (memcpy):
+	Use cghi instead of chi to compare 64bit value.
+
+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.