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authorStefan Liebler <stli@linux.vnet.ibm.com>2016-05-24 10:39:13 +0200
committerStefan Liebler <stli@linux.vnet.ibm.com>2016-05-24 10:39:13 +0200
commit074b0f27d9b9cdfb58c5c7e7f4129546084582b2 (patch)
tree60ec9037761a7cff348540574d5d0f3cfea71665 /sysdeps/s390/s390-64
parent04bb21ac93e90d7696bcaf8febe2b2dd2d83585a (diff)
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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.
Diffstat (limited to 'sysdeps/s390/s390-64')
-rw-r--r--sysdeps/s390/s390-64/memcpy.S2
1 files changed, 1 insertions, 1 deletions
diff --git a/sysdeps/s390/s390-64/memcpy.S b/sysdeps/s390/s390-64/memcpy.S
index e84a3572cb..9d60a14ccc 100644
--- a/sysdeps/s390/s390-64/memcpy.S
+++ b/sysdeps/s390/s390-64/memcpy.S
@@ -47,7 +47,7 @@ ENTRY(memcpy)
 .L_Z900_4:
 	br      %r14
 .L_Z900_13:
-	chi	%r5,4096             # Switch to mvcle for copies >1MB
+	cghi	%r5,4096            # Switch to mvcle for copies >1MB
 	jh      __memcpy_mvcle
 .L_Z900_12:
 	mvc     0(256,%r1),0(%r3)