| /* Vector Optimized 32/64 bit S/390 version of wmemset. |
| 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/>. */ |
| |
| #if defined HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) |
| |
| # include "sysdep.h" |
| # include "asm-syntax.h" |
| |
| .text |
| |
| /* wchar_t *wmemset(wchar_t *dest, wchar_t wc, size_t n) |
| Fill an array of wide-characters with a constant wide character |
| and returns dest. |
| |
| Register usage: |
| -r0=tmp |
| -r1=tmp |
| -r2=dest or current-pointer |
| -r3=wc |
| -r4=n |
| -r5=tmp |
| -v16=replicated wc |
| -v17,v18,v19=copy of v16 for vstm |
| -v31=saved dest for return |
| */ |
| ENTRY(__wmemset_vx) |
| .machine "z13" |
| .machinemode "zarch_nohighgprs" |
| |
| # if !defined __s390x__ |
| llgfr %r4,%r4 |
| # endif /* !defined __s390x__ */ |
| |
| vlvgg %v31,%r2,0 /* Save destination pointer for return. */ |
| clgije %r4,0,.Lend |
| |
| vlvgf %v16,%r3,0 /* Generate vector with wchar_t wc. */ |
| vrepf %v16,%v16,0 |
| |
| /* Check range of maxlen and convert to byte-count. */ |
| # ifdef __s390x__ |
| tmhh %r4,49152 /* Test bit 0 or 1 of maxlen. */ |
| lghi %r5,-4 /* Max byte-count is 18446744073709551612. */ |
| # else |
| tmlh %r4,49152 /* Test bit 0 or 1 of maxlen. */ |
| llilf %r5,4294967292 /* Max byte-count is 4294967292. */ |
| # endif /* !__s390x__ */ |
| sllg %r4,%r4,2 /* Convert character-count to byte-count. */ |
| locgrne %r4,%r5 /* Use max byte-count, if bit 0/1 was one. */ |
| |
| /* Align dest to 16 byte. */ |
| risbg %r0,%r2,60,128+63,0 /* Test if s is aligned and |
| %r3 = bits 60-63 'and' 15. */ |
| je .Lpreloop /* If s is aligned, loop aligned. */ |
| tmll %r2,3 /* Test if s is 4-byte aligned? */ |
| jne .Lfallback /* And use common-code variant if not. */ |
| lghi %r1,16 |
| slr %r1,%r0 /* Compute byte count to load (16-x). */ |
| clgr %r1,%r4 |
| locgrh %r1,%r4 /* min (byte count, n) */ |
| aghik %r5,%r1,-1 /* vstl needs highest index. */ |
| vstl %v16,%r5,0(%r2) /* Store remaining bytes. */ |
| clgrje %r1,%r4,.Lend /* Return if n bytes where set. */ |
| slgr %r4,%r1 /* Compute remaining byte count. */ |
| la %r2,0(%r1,%r2) |
| |
| .Lpreloop: |
| /* Now we are 16-byte aligned. */ |
| clgijl %r4,17,.Lremaining |
| srlg %r1,%r4,8 /* Split into 256byte blocks */ |
| clgije %r1,0,.Lpreloop64 |
| vlr %v17,%v16 |
| vlr %v18,%v16 |
| vlr %v19,%v16 |
| |
| .Lloop256: |
| vstm %v16,%v19,0(%r2) |
| vstm %v16,%v19,64(%r2) |
| vstm %v16,%v19,128(%r2) |
| vstm %v16,%v19,192(%r2) |
| la %r2,256(%r2) |
| brctg %r1,.Lloop256 /* Loop until all blocks are processed. */ |
| |
| llgfr %r4,%r4 |
| nilf %r4,255 /* Get remaining bytes */ |
| je .Lend /* Skip store remaining bytes if zero. */ |
| |
| .Lpreloop64: |
| clgijl %r4,17,.Lremaining |
| clgijl %r4,33,.Lpreloop16 |
| srlg %r1,%r4,5 /* Split into 32byte blocks */ |
| |
| .Lloop32: |
| vst %v16,0(%r2) |
| vst %v16,16(%r2) |
| la %r2,32(%r2) |
| brctg %r1,.Lloop32 /* Loop until all blocks are processed. */ |
| |
| llgfr %r4,%r4 |
| nilf %r4,31 /* Get remaining bytes */ |
| je .Lend /* Skip store remaining bytes if zero. */ |
| |
| .Lpreloop16: |
| clgijl %r4,17,.Lremaining |
| srlg %r1,%r4,4 /* Split into 16byte blocks */ |
| |
| .Lloop16: |
| vst %v16,0(%r2) |
| la %r2,16(%r2) |
| brctg %r1,.Lloop16 /* Loop until all blocks are processed. */ |
| |
| llgfr %r4,%r4 |
| nilf %r4,15 /* Get remaining bytes */ |
| je .Lend /* Skip store remaining bytes if zero. */ |
| |
| .Lremaining: |
| aghi %r4,-1 /* vstl needs highest index. */ |
| vstl %v16,%r4,0(%r2) |
| |
| .Lend: |
| vlgvg %r2,%v31,0 /* Load saved dest for return value. */ |
| br %r14 |
| .Lfallback: |
| srlg %r4,%r4,2 /* Convert byte-count to character-count. */ |
| jg __wmemset_c |
| END(__wmemset_vx) |
| #endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */ |
