glibc/sysdeps/s390/stpncpy-vx.S
Stefan Liebler 25218822bd S390: Refactor stpncpy ifunc handling.
The ifunc handling for stpncpy is adjusted in order to omit ifunc
variants if those will never be used as the minimum architecture level
already supports newer CPUs by default.
Glibc internal calls will then also use the "newer" ifunc variant.

ChangeLog:

	* sysdeps/s390/multiarch/Makefile
	(sysdep_routines): Remove stpncpy variants.
	* sysdeps/s390/Makefile (sysdep_routines): Add stpncpy variants.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Refactor ifunc handling for stpncpy.
	* sysdeps/s390/multiarch/stpncpy-c.c: Move to ...
	* sysdeps/s390/stpncpy-c.c: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/stpncpy-vx.S: Move to ...
	* sysdeps/s390/stpncpy-vx.S: ... here and adjust ifunc handling.
	* sysdeps/s390/multiarch/stpncpy.c: Move to ...
	* sysdeps/s390/stpncpy.c: ... here and adjust ifunc handling.
	* sysdeps/s390/ifunc-stpncpy.h: New file.
2018-12-18 13:57:11 +01:00

212 lines
6.4 KiB
ArmAsm

/* Vector optimized 32/64 bit S/390 version of stpncpy.
Copyright (C) 2015-2018 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 <ifunc-stpncpy.h>
#if HAVE_STPNCPY_Z13
# include "sysdep.h"
# include "asm-syntax.h"
.text
/* char * stpncpy (char *dest, const char *src, size_t n)
Copies at most n characters of string src to dest
returning a pointer to its end or dest+n
if src is smaller than n.
Register usage:
-%r0 = return value
-%r1 = zero byte index
-%r2 = curr dst pointer
-%r3 = curr src pointer
-%r4 = n
-%r5 = current_len
-%r6 = loaded bytes
-%r7 = border, tmp
*/
ENTRY(STPNCPY_Z13)
.machine "z13"
.machinemode "zarch_nohighgprs"
# if !defined __s390x__
llgfr %r4,%r4
# endif /* !defined __s390x__ */
clgfi %r4,0
ber %r14 /* Nothing to do, if n == 0. */
la %r0,0(%r4,%r2) /* Save destination pointer + n for return. */
vlvgp %v31,%r6,%r7 /* Save registers. */
vlbb %v16,0(%r3),6 /* Load s until next 4k-byte boundary. */
lcbb %r6,0(%r3),6 /* Get bytes to 4k-byte boundary or 16. */
llgfr %r6,%r6 /* Convert 32bit to 64bit. */
lghi %r5,0 /* current_len = 0. */
clgrjle %r4,%r6,.Lremaining_v16 /* If n <= loaded-bytes
-> process remaining. */
/* n > loaded-byte-count */
vfenezb %v17,%v16,%v16 /* Find element not equal with zero search. */
vlgvb %r1,%v17,7 /* Load zero index or 16 if not found. */
clrjl %r1,%r6,.Lfound_v16_store /* Found zero within loaded bytes,
copy and return. */
/* Align s to 16 byte. */
risbgn %r7,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
lghi %r5,15 /* current_len = 15. */
slr %r5,%r7 /* Compute highest index to 16byte boundary. */
/* Zero not found and n > loaded-byte-count. */
vstl %v16,%r5,0(%r2) /* Copy loaded characters - no zero. */
ahi %r5,1 /* Start loop at next character. */
/* Now we are 16byte aligned, so we can load a full vreg
without page fault. */
lgr %r1,%r5 /* If %r5 + 64 < maxlen? -> loop64. */
aghi %r1,64
clgrjl %r1,%r4,.Lloop64
vl %v16,0(%r5,%r3) /* Load s. */
clgijl %r4,17,.Lremaining_v16 /* If n <= 16, process remaining
bytes. */
.Llt64:
lgr %r7,%r4
slgfi %r7,16 /* border_len = n - 16. */
clgrjhe %r5,%r7,.Lremaining_v16 /* If current_len >= border
then process remaining bytes. */
vfenezbs %v17,%v16,%v16 /* Find element not equal with zero search. */
je .Lfound_v16 /* Jump away if zero was found. */
vl %v18,16(%r5,%r3) /* Load next part of s. */
vst %v16,0(%r5,%r2) /* Save previous part without zero to dst. */
aghi %r5,16
clgrjhe %r5,%r7,.Lremaining_v18
vfenezbs %v17,%v18,%v18
je .Lfound_v18
vl %v16,16(%r5,%r3)
vst %v18,0(%r5,%r2)
aghi %r5,16
clgrjhe %r5,%r7,.Lremaining_v16
vfenezbs %v17,%v16,%v16
je .Lfound_v16
vl %v18,16(%r5,%r3)
vst %v16,0(%r5,%r2)
aghi %r5,16
.Lremaining_v18:
vlr %v16,%v18
.Lremaining_v16:
/* v16 contains the remaining bytes [1...16].
Store remaining bytes and append string-termination. */
vfenezb %v17,%v16,%v16 /* Find element not equal with zero search. */
slgrk %r7,%r4,%r5 /* Remaining bytes = maxlen - current_len */
aghi %r7,-1 /* vstl needs highest index. */
la %r2,0(%r5,%r2) /* vstl has no index register. */
vlgvb %r1,%v17,7 /* Load zero index or 16 if not found. */
/* Zero in remaining bytes? -> jump away (zero-index <= max-index). */
clrjle %r1,%r7,.Lfound_v16_store
vstl %v16,%r7,0(%r2) /* Store remaining bytes without null
termination! */
.Lend:
/* Restore saved registers. */
vlgvg %r6,%v31,0
vlgvg %r7,%v31,1
lgr %r2,%r0 /* Load saved dest-ptr. */
br %r14
.Lfound_v16_32:
aghi %r5,32
j .Lfound_v16
.Lfound_v18_48:
aghi %r5,32
.Lfound_v18_16:
aghi %r5,16
.Lfound_v18:
vlr %v16,%v18
.Lfound_v16:
/* v16 contains a zero. Store remaining bytes to zero. current_len
has not reached border, thus checking for n is not needed! */
vlgvb %r1,%v17,7 /* Load byte index of zero. */
la %r2,0(%r5,%r2) /* vstl has no support for index-register. */
.Lfound_v16_store:
vstl %v16,%r1,0(%r2) /* Copy characters including zero. */
/* Fill remaining bytes with zero - remaining count always > 0. */
algr %r5,%r1 /* Remaining bytes (=%r4) = ... */
slgr %r4,%r5 /* = maxlen - (currlen + zero_index + 1) */
la %r2,0(%r1,%r2) /* Pointer to zero. start filling beyond. */
lgr %r0,%r2 /* Save return-pointer to found zero. */
clgije %r4,1,.Lend /* Skip zero-filling, if found zero is last
possible character.
(1 is substracted from r4 below!). */
aghi %r4,-2 /* mvc with exrl needs count - 1.
(additional -1, see remaining bytes above) */
srlg %r6,%r4,8 /* Split into 256 byte blocks. */
ltgr %r6,%r6
je .Lzero_lt256
.Lzero_loop256:
mvc 1(256,%r2),0(%r2) /* Fill 256 zeros at once. */
la %r2,256(%r2)
brctg %r6,.Lzero_loop256 /* Loop until all blocks are processed. */
.Lzero_lt256:
exrl %r4,.Lmvc_lt256
j .Lend
.Lmvc_lt256:
mvc 1(1,%r2),0(%r2)
.Lloop64:
vl %v16,0(%r5,%r3)
vfenezbs %v17,%v16,%v16 /* Find element not equal with zero search. */
je .Lfound_v16 /* Jump away if zero was found. */
vl %v18,16(%r5,%r3) /* Load next part of s. */
vst %v16,0(%r5,%r2) /* Save previous part without zero to dst. */
vfenezbs %v17,%v18,%v18
je .Lfound_v18_16
vl %v16,32(%r5,%r3)
vst %v18,16(%r5,%r2)
vfenezbs %v17,%v16,%v16
je .Lfound_v16_32
vl %v18,48(%r5,%r3)
vst %v16,32(%r5,%r2)
vfenezbs %v17,%v18,%v18
je .Lfound_v18_48
vst %v18,48(%r5,%r2)
aghi %r5,64
lgr %r1,%r5 /* If %r5 + 64 < maxlen? -> loop64. */
aghi %r1,64
clgrjl %r1,%r4,.Lloop64
vl %v16,0(%r5,%r3) /* Load s. */
j .Llt64
END(STPNCPY_Z13)
# if ! HAVE_STPNCPY_IFUNC
strong_alias (STPNCPY_Z13, __stpncpy)
weak_alias (__stpncpy, stpncpy)
# endif
# if ! HAVE_STPNCPY_C && defined SHARED && IS_IN (libc)
strong_alias (STPNCPY_Z13, __GI___stpncpy)
# endif
#endif