mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-09 14:50:05 +00:00
326 lines
11 KiB
ArmAsm
326 lines
11 KiB
ArmAsm
/* Vector optimized 32/64 bit S/390 version of wcspbrk.
|
|
Copyright (C) 2015-2024 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 <ifunc-wcspbrk.h>
|
|
#if HAVE_WCSPBRK_Z13
|
|
|
|
# include "sysdep.h"
|
|
# include "asm-syntax.h"
|
|
|
|
.text
|
|
|
|
/* wchar_t *wcspbrk (const wchar_t *s, const wchar_t * accept)
|
|
The wcspbrk() function locates the first occurrence in the string s
|
|
of any of the characters in the string accept and returns a pointer
|
|
to that character or NULL if not found.
|
|
|
|
This method checks the length of accept string. If it fits entirely
|
|
in one vector register, a fast algorithm is used, which does not need
|
|
to check multiple parts of accept-string. Otherwise a slower full
|
|
check of accept-string is used.
|
|
|
|
register overview:
|
|
r3: pointer to start of accept-string
|
|
r2: pointer to start of search-string
|
|
r0: loaded byte count of vlbb search-string (32bit unsigned)
|
|
r4: found byte index (32bit unsigned)
|
|
r1: current return len (64bit unsigned)
|
|
v16: search-string
|
|
v17: accept-string
|
|
v18: temp-vreg
|
|
|
|
ONLY FOR SLOW:
|
|
v19: first accept-string
|
|
v20: zero for preparing acc-vector
|
|
v21: global mask; 1 indicates a match between
|
|
search-string-vreg and any accept-character
|
|
v22: current mask; 1 indicates a match between
|
|
search-string-vreg and any accept-character in current acc-vreg
|
|
v24: one for result-checking of former string-part
|
|
v30, v31: for re-/storing registers r6, r8, r9
|
|
r5: current len of accept-string
|
|
r6: zero-index in search-string or 16 if no zero
|
|
or min(zero-index, loaded byte count)
|
|
r8: >0, if former accept-string-part contains a zero,
|
|
otherwise =0;
|
|
r9: loaded byte count of vlbb accept-string
|
|
*/
|
|
ENTRY(WCSPBRK_Z13)
|
|
.machine "z13"
|
|
.machinemode "zarch_nohighgprs"
|
|
|
|
tmll %r2,3 /* Test if s is 4-byte aligned? */
|
|
jne .Lfallback /* And use common-code variant if not. */
|
|
|
|
/*
|
|
Check if accept-string fits in one vreg:
|
|
----------------------------------------
|
|
*/
|
|
vlbb %v17,0(%r3),6 /* Load accept. */
|
|
lcbb %r0,0(%r3),6
|
|
jo .Lcheck_onbb /* Special case if accept lays
|
|
on block-boundary. */
|
|
|
|
.Lcheck_notonbb:
|
|
lghi %r1,0 /* Zero out current len. */
|
|
vlgvf %r0,%v17,0 /* Get first element. */
|
|
clije %r0,0,.Lfast_end_null /* Return null if accept is empty. */
|
|
|
|
vistrfs %v17,%v17 /* Fill with zeros after first zero. */
|
|
je .Lfast /* Zero found -> accept fits in one vreg. */
|
|
j .Lslow /* No zero -> accept exceeds one vreg */
|
|
|
|
|
|
.Lcheck_onbb:
|
|
/* Accept lays on block-boundary. */
|
|
nill %r0,65532 /* Recognize only fully loaded characters. */
|
|
je .Lcheck_onbb2 /* Reload vr, if we loaded no full wchar_t. */
|
|
vfenezf %v18,%v17,%v17 /* Search zero in loaded accept bytes. */
|
|
vlgvb %r4,%v18,7 /* Get index of zero or 16 if not found. */
|
|
clrjl %r4,%r0,.Lcheck_notonbb /* Zero index < loaded bytes count ->
|
|
accept fits in one vreg;
|
|
Fill with zeros and proceed
|
|
with FAST. */
|
|
.Lcheck_onbb2:
|
|
vl %v17,0(%r3) /* Load accept, which exceeds loaded bytes. */
|
|
j .Lcheck_notonbb /* Check if accept fits in one vreg. */
|
|
|
|
|
|
/*
|
|
Search s for accept in one vreg
|
|
-------------------------------
|
|
*/
|
|
.Lfast:
|
|
/* Complete accept-string in v17 and remaining bytes are zero. */
|
|
|
|
vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */
|
|
lcbb %r0,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */
|
|
|
|
vfaezfs %v18,%v16,%v17,0 /* Find first element in v16 unequal to any
|
|
in v17 or first zero element. */
|
|
vlgvb %r4,%v18,7 /* Load byte index of found element. */
|
|
/* If found index is within loaded bytes, return with found
|
|
element index (=equal count). */
|
|
clrjl %r4,%r0,.Lfast_loop_found2
|
|
|
|
/* Align s to 16 byte. */
|
|
risbgn %r4,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
|
|
lghi %r1,16 /* current_len = 16. */
|
|
slr %r1,%r4 /* Compute bytes to 16bytes boundary. */
|
|
|
|
.Lfast_loop:
|
|
vl %v16,0(%r1,%r2) /* Load search-string. */
|
|
vfaezfs %v18,%v16,%v17,0 /* Find first element in v16 equal to any
|
|
in v17 or first zero element. */
|
|
jno .Lfast_loop_found
|
|
|
|
vl %v16,16(%r1,%r2)
|
|
vfaezfs %v18,%v16,%v17,0
|
|
jno .Lfast_loop_found16
|
|
|
|
vl %v16,32(%r1,%r2)
|
|
vfaezfs %v18,%v16,%v17,0
|
|
jno .Lfast_loop_found32
|
|
|
|
vl %v16,48(%r1,%r2)
|
|
vfaezfs %v18,%v16,%v17,0
|
|
jno .Lfast_loop_found48
|
|
|
|
aghi %r1,64
|
|
j .Lfast_loop /* Loop if no element was unequal to accept
|
|
and not zero. */
|
|
|
|
/* Found equal or zero element. */
|
|
.Lfast_loop_found48:
|
|
aghi %r1,16
|
|
.Lfast_loop_found32:
|
|
aghi %r1,16
|
|
.Lfast_loop_found16:
|
|
aghi %r1,16
|
|
.Lfast_loop_found:
|
|
vlgvb %r4,%v18,7 /* Load byte index of found element. */
|
|
.Lfast_loop_found2:
|
|
srlg %r5,%r4,2 /* Convert byte-index to character-index. */
|
|
vlgvf %r0,%v16,0(%r5) /* Get found element. */
|
|
clije %r0,0,.Lfast_end_null /* Return null if no accept-char found */
|
|
algfr %r1,%r4 /* Add found index of char to current len. */
|
|
la %r2,0(%r1,%r2) /* And return pointer to first equal char. */
|
|
br %r14
|
|
|
|
.Lfast_end_null:
|
|
lghi %r2,0 /* Return null if no character is equal. */
|
|
br %r14
|
|
|
|
|
|
|
|
|
|
/*
|
|
Search s for accept in multiple vregs
|
|
-------------------------------------
|
|
*/
|
|
.Lslow:
|
|
/* Save registers. */
|
|
vlvgg %v30,%r6,0
|
|
vlvgp %v31,%r8,%r9
|
|
|
|
/* Accept in v17 without zero */
|
|
vlr %v19,%v17 /* Save first acc-part for a fast reload. */
|
|
vzero %v20 /* Zero for preparing acc-vector. */
|
|
vone %v24 /* One for checking result of former string. */
|
|
|
|
/* Align s to 16 byte. */
|
|
risbg %r4,%r2,60,128+63,0 /* Test if s is aligned and
|
|
%r4 = bits 60-63 'and' 15. */
|
|
je .Lslow_loop_str /* If s is aligned, loop aligned. */
|
|
lghi %r0,15
|
|
slr %r0,%r4 /* Compute highest index to load (15-x). */
|
|
vll %v16,%r0,0(%r2) /* Load up to 16byte boundary;
|
|
needs highest index, left bytes are 0. */
|
|
ahi %r0,1 /* Work with loaded byte count. */
|
|
vzero %v21 /* Zero out global mask. */
|
|
lghi %r5,0 /* Set current len of accept-string to zero. */
|
|
vfenezf %v18,%v16,%v16 /* Find zero in current string-part. */
|
|
lghi %r8,0 /* There is no zero in first accept-part. */
|
|
vlgvb %r6,%v18,7 /* Load byte index of zero or 16 if no zero. */
|
|
clije %r6,0,.Lslow_end_null /* If first element is zero
|
|
(end of string) -> return null */
|
|
clr %r0,%r6 /* cc==1 if loaded byte count < zero-index. */
|
|
locrl %r6,%r0 /* Load on cc==1; zero-index = lbc. */
|
|
j .Lslow_loop_acc
|
|
|
|
|
|
/* Process s in 16byte aligned loop. */
|
|
.Lslow_next_str:
|
|
/* Check results of former processed str-part. */
|
|
vfeef %v18,%v21,%v24 /* Find first equal match in global mask
|
|
(ones in element). */
|
|
vlgvb %r4,%v18,7 /* Get index of first one (=equal)
|
|
or 16 if no match. */
|
|
/* Equal-index < min(zero-index, loaded byte count)
|
|
-> return pointer to equal element. */
|
|
clrjl %r4,%r6,.Lslow_index_found
|
|
/* Zero-index < loaded byte count
|
|
-> former str-part was last str-part
|
|
-> return null */
|
|
clrjl %r6,%r0,.Lslow_end_null
|
|
/* All elements are zero (=no match) -> proceed with next str-part. */
|
|
|
|
vlr %v17,%v19 /* Load first part of accept (no zero). */
|
|
algfr %r1,%r0 /* Add loaded byte count to current len. */
|
|
|
|
.Lslow_loop_str:
|
|
vl %v16,0(%r1,%r2) /* Load search-string */
|
|
lghi %r0,16 /* Loaded byte count is 16. */
|
|
vzero %v21 /* Zero out global mask. */
|
|
lghi %r5,0 /* Set current len of accept to zero. */
|
|
vfenezf %v18,%v16,%v16 /* Find zero in current string-part. */
|
|
lghi %r8,0 /* There is no zero in first accept-part. */
|
|
vlgvb %r6,%v18,7 /* Load byte index of zero or 16 if no zero. */
|
|
clije %r6,0,.Lslow_end_null /* If first element is zero
|
|
(end of string) -> return null. */
|
|
|
|
.Lslow_loop_acc:
|
|
vfaef %v22,%v16,%v17,4 /* Create matching-mask (1 in mask ->
|
|
Character matches any accepted character in
|
|
this accept-string-part) IN=0, RT=1. */
|
|
vlgvf %r4,%v22,0 /* Get result of first element. */
|
|
/* First element is equal to any accepted characters
|
|
(all other parts of accept cannot lead to a match before this one)
|
|
-> current len is pointing to first element
|
|
-> return found */
|
|
clijh %r4,0,.Lslow_end_found
|
|
vo %v21,%v21,%v22 /* Global-mask = global-|matching-mask. */
|
|
/* Proceed with next acc until end of acc is reached. */
|
|
|
|
|
|
.Lslow_next_acc:
|
|
clijh %r8,0,.Lslow_next_str /* There was a zero in the last acc-part
|
|
-> add index to current len and
|
|
end. */
|
|
vlbb %v17,16(%r5,%r3),6 /* Load next accept part. */
|
|
aghi %r5,16 /* Increment current len of accept-string. */
|
|
lcbb %r9,0(%r5,%r3),6 /* Get loaded byte count of accept-string. */
|
|
jo .Lslow_next_acc_onbb /* Jump away ifaccept-string is
|
|
on block-boundary. */
|
|
.Lslow_next_acc_notonbb:
|
|
vistrfs %v17,%v17 /* Fill with zeros after first zero. */
|
|
jo .Lslow_loop_acc /* No zero found -> no preparation needed. */
|
|
|
|
.Lslow_next_acc_prepare_zero:
|
|
/* Zero in accept-part: fill zeros with first-accept-character. */
|
|
vlgvf %r8,%v17,0 /* Load first element of acc-part. */
|
|
clije %r8,0,.Lslow_next_str /* Proceed with next string-part,
|
|
If first char in this part of accept
|
|
is a zero. */
|
|
/* r8>0 -> zero found in this acc-part. */
|
|
vrepf %v18,%v17,0 /* Replicate first char across all chars. */
|
|
vceqf %v22,%v20,%v17 /* Create a mask (v22) of null chars
|
|
by comparing with 0 (v20). */
|
|
vsel %v17,%v18,%v17,%v22 /* Replace null chars with first char. */
|
|
j .Lslow_loop_acc /* Accept part is prepared -> process. */
|
|
|
|
.Lslow_next_acc_onbb:
|
|
nill %r9,65532 /* Recognize only fully loaded characters. */
|
|
je .Lslow_next_acc_onbb2 /* Reload vr, if no full wchar_t. */
|
|
vfenezf %v18,%v17,%v17 /* Find zero in loaded bytes of accept part. */
|
|
vlgvb %r8,%v18,7 /* Load byte index of zero. */
|
|
clrjl %r8,%r9,.Lslow_next_acc_notonbb /* Found a zero in loaded bytes
|
|
-> Prepare vreg. */
|
|
.Lslow_next_acc_onbb2:
|
|
vl %v17,0(%r5,%r3) /* Load over boundary ... */
|
|
lghi %r8,0 /* r8=0 -> no zero in this part of acc,
|
|
check for zero is in jump-target. */
|
|
j .Lslow_next_acc_notonbb /* ... and search for zero in
|
|
fully loaded vreg again. */
|
|
|
|
.Lslow_end_null:
|
|
lghi %r1,0 /* Return null if no character is equal. */
|
|
j .Lslow_end
|
|
|
|
.Lslow_loop_found:
|
|
vlgvb %r4,%v18,7 /* Load byte index of found element. */
|
|
srlg %r5,%r4,2 /* Convert byte-index to character-index. */
|
|
vlgvf %r0,%v16,0(%r5) /* Get found element. */
|
|
clije %r0,0,.Lslow_end_null /* Return null if no acc-char found. */
|
|
|
|
.Lslow_index_found:
|
|
algfr %r1,%r4 /* Add found index of char to current len. */
|
|
.Lslow_end_found:
|
|
la %r1,0(%r1,%r2) /* And return pointer to first equal char. */
|
|
|
|
.Lslow_end:
|
|
/* Restore registers. */
|
|
vlgvg %r6,%v30,0
|
|
vlgvg %r8,%v31,0
|
|
vlgvg %r9,%v31,1
|
|
lgr %r2,%r1
|
|
br %r14
|
|
.Lfallback:
|
|
jg WCSPBRK_C
|
|
END(WCSPBRK_Z13)
|
|
|
|
# if ! HAVE_WCSPBRK_IFUNC
|
|
strong_alias (WCSPBRK_Z13, wcspbrk)
|
|
# endif
|
|
|
|
# if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT \
|
|
&& defined SHARED && IS_IN (libc)
|
|
strong_alias (WCSPBRK_Z13, __GI_wcspbrk)
|
|
# endif
|
|
#endif
|