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[1/4] S390: Use mvcle for copies > 1MB on 32bit with default memcpy variant.

Message ID 1461672469-2107-1-git-send-email-stli@linux.vnet.ibm.com
State New
Headers show

Commit Message

Stefan Liebler April 26, 2016, 12:07 p.m. UTC 
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.
---
 sysdeps/s390/s390-32/memcpy.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/sysdeps/s390/s390-32/memcpy.S b/sysdeps/s390/s390-32/memcpy.S
index 62ecbbf..2ac51ab 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)