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Use mvcle for big blocks (> 64K) and a mvc loop for small blocks.

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This commit is contained in:
Ulrich Drepper 2001-07-16 06:29:42 +00:00
parent a6d214835f
commit 3c204435e9
4 changed files with 61 additions and 14 deletions
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27
sysdeps/s390/s390-32/bcopy.S
View File

@ -34,12 +34,14 @@ ENTRY(__bcopy)
jnl .L0
alr %r1,%r2
clr %r1,%r3
jh .L5
jh .L7
.L0: ahi %r4,-1 # length - 1
lr %r1,%r4
srl %r1,8
ltr %r1,%r1
ltr %r1,%r1 # < 256 bytes to move ?
jz .L2
chi %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)
@ -49,22 +51,31 @@ ENTRY(__bcopy)
.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: ahi %r4,1 # length + 1
lr %r5,%r4 # source length
lr %r4,%r2 # source address
lr %r2,%r3 # set destination
lr %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
lr %r1,%r2 # bcopy is called with source,dest
lr %r2,%r3 # memmove with dest,source! Oh, well...
lr %r3,%r1
basr %r1,0
.L6:
.L8:
#ifdef PIC
al %r1,.L7-.L6(%r1) # get address of global offset table
al %r1,.L9-.L8(%r1) # get address of global offset table
# load address of memmove
l %r1,memmove@GOT12(%r1)
br %r1
.L7: .long _GLOBAL_OFFSET_TABLE_-.L6
.L9: .long _GLOBAL_OFFSET_TABLE_-.L8
#else
al %r1,.L7-.L6(%r1) # load address of memmove
al %r1,.L9-.L8(%r1) # load address of memmove
br %r1 # jump to memmove
.L7: .long memmove-.L6
.L9: .long memmove-.L8
#endif
END(__bcopy)

15
sysdeps/s390/s390-32/memcpy.S
View File

@ -33,8 +33,11 @@ ENTRY(memcpy)
ahi %r4,-1 # length - 1
lr %r1,%r2 # copy destination address
lr %r5,%r4
sra %r5,8
srl %r5,8
ltr %r5,%r5 # < 256 bytes to move ?
jz .L1
chi %r5,255 # > 1MB to move ?
jh .L4
.L0: mvc 0(256,%r1),0(%r3) # move in 256 byte chunks
la %r1,256(%r1)
la %r3,256(%r3)
@ -43,5 +46,15 @@ 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: ahi %r4,1 # length + 1
lr %r5,%r4 # source length
lr %r4,%r2 # source address
lr %r2,%r3 # set destination
lr %r3,%r5 # destination length = source length
.L5: mvcle %r2,%r4,0 # thats it, MVCLE is your friend
jo .L5
lr %r2,%r1 # return destination address
br %r14
END(memcpy)

18
sysdeps/s390/s390-64/bcopy.S
View File

@ -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

15
sysdeps/s390/s390-64/memcpy.S
View File

@ -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)