diff options
Diffstat (limited to 'sysdeps/s390/s390-64/memcpy.S')
| -rw-r--r-- | sysdeps/s390/s390-64/memcpy.S | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/sysdeps/s390/s390-64/memcpy.S b/sysdeps/s390/s390-64/memcpy.S index 8212bd39d6..d13c0ad14e 100644 --- a/sysdeps/s390/s390-64/memcpy.S +++ b/sysdeps/s390/s390-64/memcpy.S @@ -32,8 +32,11 @@ ENTRY(memcpy) jz .L3 aghi %r4,-1 # length - 1 lgr %r1,%r2 # copy destination address - srag %r5,%r4,8 + srlg %r5,%r4,8 + ltgr %r5,%r5 # < 256 bytes to mvoe ? jz .L1 + chi %r6,255 # > 1 MB to move ? + jh .L4 .L0: mvc 0(256,%r1),0(%r3) # move in 256 byte chunks la %r1,256(%r1) la %r3,256(%r3) @@ -42,5 +45,15 @@ ENTRY(memcpy) mvc 0(1,%r1),0(%r3) # instruction for execute .L2: ex %r4,0(%r5) # execute mvc with length ((%r4)&255)+1 .L3: br %r14 + # data copies > 1MB are faster with mvcle. +.L4: 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 +.L5: mvcle %r2,%r4,0 # thats it, MVCLE is your friend + jo .L5 + lgr %r2,%r1 # return destination address + br %r14 END(memcpy) |