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/* memcmp - compare two memory blocks. 31/64 bit S/390 version.
Copyright (C) 2012-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include "asm-syntax.h"
/* INPUT PARAMETERS
%r2 = address of first memory area
%r3 = address of second memory area
%r4 = number of bytes to compare. */
.text
#if defined __s390x__
# define LTGR ltgr
# define AGHI aghi
# define BRCTG brctg
#else
# define LTGR ltr
# define AGHI ahi
# define BRCTG brct
#endif /* ! defined __s390x__ */
#ifdef USE_MULTIARCH
ENTRY(__memcmp_default)
#else
ENTRY(memcmp)
#endif
#if defined __s390x__
.machine "z900"
#else
.machine "g5"
basr %r5,0
.L_Z900_G5_16:
# define Z900_G5_EX_D .L_Z900_G5_15-.L_Z900_G5_16
#endif /* ! defined __s390x__ */
LTGR %r4,%r4
je .L_Z900_G5_4
AGHI %r4,-1
#if defined __s390x__
srlg %r1,%r4,8
larl %r5,.L_Z900_G5_15
# define Z900_G5_EX_D 0
#else
lr %r1,%r4
srl %r1,8
#endif /* ! defined __s390x__ */
LTGR %r1,%r1
jne .L_Z900_G5_12
.L_Z900_G5_3:
ex %r4,Z900_G5_EX_D(%r5)
.L_Z900_G5_4:
ipm %r2
#if defined __s390x__
sllg %r2,%r2,34
srag %r2,%r2,62
#else
sll %r2,2
sra %r2,30
#endif /* ! defined __s390x__ */
br %r14
.L_Z900_G5_12:
clc 0(256,%r3),0(%r2)
jne .L_Z900_G5_4
la %r3,256(%r3)
la %r2,256(%r2)
BRCTG %r1,.L_Z900_G5_12
j .L_Z900_G5_3
.L_Z900_G5_15:
clc 0(1,%r3),0(%r2)
#ifdef USE_MULTIARCH
END(__memcmp_default)
#else
END(memcmp)
libc_hidden_builtin_def (memcmp)
weak_alias (memcmp, bcmp)
#endif
#undef LTGR
#undef AGHI
#undef BRCTG
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