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/* memcmp - compare two memory blocks. 31/64 bit S/390 version.
Copyright (C) 2012-2025 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
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include "asm-syntax.h"
#include <ifunc-memcmp.h>
/* INPUT PARAMETERS
%r2 = address of first memory area
%r3 = address of second memory area
%r4 = number of bytes to compare. */
.text
#if HAVE_MEMCMP_Z900_G5
# 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__ */
ENTRY(MEMCMP_Z900_G5)
# 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)
END(MEMCMP_Z900_G5)
# undef LTGR
# undef AGHI
# undef BRCTG
#endif /* HAVE_MEMCMP_Z900_G5 */
#if HAVE_MEMCMP_Z10
ENTRY(MEMCMP_Z10)
.machine "z10"
.machinemode "zarch_nohighgprs"
# if !defined __s390x__
llgfr %r4,%r4
# endif /* !defined __s390x__ */
ltgr %r4,%r4
je .L_Z10_4
aghi %r4,-1
srlg %r1,%r4,8
cgijlh %r1,0,.L_Z10_12
.L_Z10_3:
exrl %r4,.L_Z10_15
.L_Z10_4:
ipm %r2
sllg %r2,%r2,34
srag %r2,%r2,62
br %r14
.L_Z10_12:
pfd 1,512(%r3)
pfd 1,512(%r2)
clc 0(256,%r3),0(%r2)
jne .L_Z10_4
la %r3,256(%r3)
la %r2,256(%r2)
brctg %r1,.L_Z10_12
j .L_Z10_3
.L_Z10_15:
clc 0(1,%r3),0(%r2)
END(MEMCMP_Z10)
#endif /* HAVE_MEMCMP_Z10 */
#if HAVE_MEMCMP_Z196
ENTRY(MEMCMP_Z196)
.machine "z196"
.machinemode "zarch_nohighgprs"
# if !defined __s390x__
llgfr %r4,%r4
# endif /* !defined __s390x__ */
ltgr %r4,%r4
je .L_Z196_4
aghi %r4,-1
srlg %r1,%r4,8
ltgr %r1,%r1
jne .L_Z196_2
.L_Z196_3:
exrl %r4,.L_Z196_14
.L_Z196_4:
ipm %r2
sllg %r2,%r2,34
srag %r2,%r2,62
br %r14
.L_Z196_17:
la %r3,256(%r3)
la %r2,256(%r2)
aghi %r1,-1
je .L_Z196_3
.L_Z196_2:
pfd 1,512(%r3)
pfd 1,512(%r2)
clc 0(256,%r3),0(%r2)
je .L_Z196_17
ipm %r2
sllg %r2,%r2,34
srag %r2,%r2,62
br %r14
.L_Z196_14:
clc 0(1,%r3),0(%r2)
END(MEMCMP_Z196)
#endif /* HAVE_MEMCMP_Z196 */
#if ! HAVE_MEMCMP_IFUNC
/* If we don't use ifunc, define an alias for memcmp here.
Otherwise see sysdeps/s390/memcmp.c. */
strong_alias (MEMCMP_DEFAULT, memcmp)
weak_alias (memcmp, bcmp)
strong_alias (memcmp, __memcmpeq)
libc_hidden_def (__memcmpeq)
#endif
#if defined SHARED && IS_IN (libc)
/* Defines the internal symbols.
Compare to libc_hidden_builtin_def (memcmp) in string/memcmp.c. */
strong_alias (MEMCMP_DEFAULT, __GI_memcmp)
#endif
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