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| author | Stefan Liebler <stli@linux.vnet.ibm.com> | 2016-05-24 10:39:13 +0200 |
|---|---|---|
| committer | Stefan Liebler <stli@linux.vnet.ibm.com> | 2016-05-24 10:39:13 +0200 |
| commit | 074b0f27d9b9cdfb58c5c7e7f4129546084582b2 (patch) | |
| tree | 60ec9037761a7cff348540574d5d0f3cfea71665 | |
| parent | 04bb21ac93e90d7696bcaf8febe2b2dd2d83585a (diff) | |
| download | glibc-074b0f27d9b9cdfb58c5c7e7f4129546084582b2.tar.gz glibc-074b0f27d9b9cdfb58c5c7e7f4129546084582b2.tar.xz glibc-074b0f27d9b9cdfb58c5c7e7f4129546084582b2.zip | |
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.
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | sysdeps/s390/s390-64/memcpy.S | 2 |
2 files changed, 6 insertions, 1 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. 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) |