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| author | Ulrich Drepper <drepper@redhat.com> | 2001-07-16 06:29:42 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2001-07-16 06:29:42 +0000 |
| commit | 3c204435e91ba20fbfef438e52fdc147e679ca58 (patch) | |
| tree | f3cdbfd9405e6844b14d51b05974284ed902099d /sysdeps/s390/s390-64/bcopy.S | |
| parent | a6d214835f18ce3232d44ed6f0aba679d090693d (diff) | |
| download | glibc-3c204435e91ba20fbfef438e52fdc147e679ca58.tar.gz | |
Use mvcle for big blocks (> 64K) and a mvc loop for small blocks.
Diffstat (limited to 'sysdeps/s390/s390-64/bcopy.S')
| -rw-r--r-- | sysdeps/s390/s390-64/bcopy.S | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/sysdeps/s390/s390-64/bcopy.S b/sysdeps/s390/s390-64/bcopy.S index bb3acdb708..ff7966723b 100644 --- a/sysdeps/s390/s390-64/bcopy.S +++ b/sysdeps/s390/s390-64/bcopy.S @@ -34,11 +34,13 @@ ENTRY(__bcopy) jnl .L0 algr %r1,%r2 clgr %r1,%r3 - jh .L5 + jh .L7 .L0: aghi %r4,-1 # length - 1 srlg %r1,%r4,8 - ltgr %r1,%r1 + ltgr %r1,%r1 # < 256 bytes to move ? jz .L2 + cghi %r1,255 # > 1MB to move ? + jh .L5 .L1: mvc 0(256,%r3),0(%r2) # move in 256 byte chunks la %r2,256(%r2) la %r3,256(%r3) @@ -47,8 +49,16 @@ ENTRY(__bcopy) mvc 0(1,%r3),0(%r2) # instruction for execute .L3: ex %r4,0(%r1) # execute mvc with length ((%r4)&255)+1 .L4: br %r14 - -.L5: # destructive overlay, can not use mvcle + # data copies > 1MB are faster with mvcle. +.L5: aghi %r4,1 # length + 1 + lgr %r5,%r4 # source length + lgr %r4,%r2 # source address + lgr %r2,%r3 # set destination + lgr %r3,%r5 # destination length = source length +.L6: mvcle %r2,%r4,0 # thats it, MVCLE is your friend + jo .L6 + br %r14 +.L7: # destructive overlay, can not use mvcle lgr %r1,%r2 # bcopy is called with source,dest lgr %r2,%r3 # memmove with dest,source! Oh, well... lgr %r3,%r1 |