S390: Remove s390 specific implementation of bcopy.
Nowadays gcc is automatically replacing a call to bcopy with a call to memmove. Thus only old binaries will call the s390 specific bcopy implementation. The s390 specific implementation is using an own implementation for memcpy in the forward case and is relying on memmove in the backward case. After removing the s390 specific bcopy, the common code bcopy is used. It just performs a tail call to memmove. ChangeLog: * sysdeps/s390/s390-32/bcopy.S: Remove. * sysdeps/s390/s390-64/bcopy.S: Likewise.
This commit is contained in:
Stefan Liebler
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18eb862d45
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2018-12-18 Stefan Liebler <stli@linux.ibm.com>
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* sysdeps/s390/s390-32/bcopy.S: Remove.
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* sysdeps/s390/s390-64/bcopy.S: Likewise.
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2018-12-18 Stefan Liebler <stli@linux.ibm.com>
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* sysdeps/s390/ifunc-memcpy.h: New File.
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@ -1,85 +0,0 @@
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/* bcopy -- copy a block from source to destination. S/390 version.
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This file is part of the GNU C Library.
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Copyright (C) 2000-2018 Free Software Foundation, Inc.
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Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* INPUT PARAMETERS
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%r2 = address of source
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%r3 = address of destination
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%r4 = number of bytes to copy. */
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#include "sysdep.h"
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#include "asm-syntax.h"
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.text
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ENTRY(__bcopy)
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ltr %r1,%r4 # zero bcopy ?
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jz .L4
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clr %r2,%r3 # check against destructive overlap
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jnl .L0
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alr %r1,%r2
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clr %r1,%r3
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jh .L7
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.L0: ahi %r4,-1 # length - 1
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lr %r1,%r4
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srl %r1,8
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ltr %r1,%r1 # < 256 bytes to move ?
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jz .L2
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chi %r1,255 # > 1MB to move ?
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jh .L5
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.L1: mvc 0(256,%r3),0(%r2) # move in 256 byte chunks
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la %r2,256(%r2)
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la %r3,256(%r3)
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brct %r1,.L1
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.L2: bras %r1,.L3 # setup base pointer for execute
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mvc 0(1,%r3),0(%r2) # instruction for execute
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.L3: ex %r4,0(%r1) # execute mvc with length ((%r4)&255)+1
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.L4: br %r14
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# data copies > 1MB are faster with mvcle.
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.L5: ahi %r4,1 # length + 1
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lr %r5,%r4 # source length
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lr %r4,%r2 # source address
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lr %r2,%r3 # set destination
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lr %r3,%r5 # destination length = source length
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.L6: mvcle %r2,%r4,0 # thats it, MVCLE is your friend
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jo .L6
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br %r14
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.L7: # destructive overlay, can not use mvcle
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lr %r1,%r2 # bcopy is called with source,dest
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lr %r2,%r3 # memmove with dest,source! Oh, well...
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lr %r3,%r1
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basr %r1,0
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.L8:
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#ifdef PIC
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al %r1,.L9-.L8(%r1) # get address of global offset table
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# load address of memmove
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l %r1,memmove@GOT(%r1)
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br %r1
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.L9: .long _GLOBAL_OFFSET_TABLE_-.L8
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#else
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al %r1,.L9-.L8(%r1) # load address of memmove
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br %r1 # jump to memmove
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.L9: .long memmove-.L8
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#endif
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END(__bcopy)
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#ifndef NO_WEAK_ALIAS
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weak_alias (__bcopy, bcopy)
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#endif
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@ -1,71 +0,0 @@
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/* bcopy -- copy a block from source to destination. 64 bit S/390 version.
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This file is part of the GNU C Library.
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Copyright (C) 2000-2018 Free Software Foundation, Inc.
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Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* INPUT PARAMETERS
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%r2 = address of source
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%r3 = address of destination
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%r4 = number of bytes to copy. */
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#include "sysdep.h"
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#include "asm-syntax.h"
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.text
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ENTRY(__bcopy)
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ltgr %r1,%r4 # zero bcopy ?
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jz .L4
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clgr %r2,%r3 # check against destructive overlap
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jnl .L0
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algr %r1,%r2
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clgr %r1,%r3
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jh .L7
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.L0: aghi %r4,-1 # length - 1
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srlg %r1,%r4,8
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ltgr %r1,%r1 # < 256 bytes to move ?
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jz .L2
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cghi %r1,255 # > 1MB to move ?
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jh .L5
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.L1: mvc 0(256,%r3),0(%r2) # move in 256 byte chunks
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la %r2,256(%r2)
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la %r3,256(%r3)
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brctg %r1,.L1
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.L2: bras %r1,.L3 # setup base pointer for execute
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mvc 0(1,%r3),0(%r2) # instruction for execute
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.L3: ex %r4,0(%r1) # execute mvc with length ((%r4)&255)+1
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.L4: br %r14
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# data copies > 1MB are faster with mvcle.
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.L5: aghi %r4,1 # length + 1
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lgr %r5,%r4 # source length
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lgr %r4,%r2 # source address
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lgr %r2,%r3 # set destination
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lgr %r3,%r5 # destination length = source length
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.L6: mvcle %r2,%r4,0 # thats it, MVCLE is your friend
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jo .L6
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br %r14
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.L7: # destructive overlay, can not use mvcle
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lgr %r1,%r2 # bcopy is called with source,dest
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lgr %r2,%r3 # memmove with dest,source! Oh, well...
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lgr %r3,%r1
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jg HIDDEN_BUILTIN_JUMPTARGET(memmove)
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END(__bcopy)
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#ifndef NO_WEAK_ALIAS
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weak_alias (__bcopy, bcopy)
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#endif
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