| /* Vector optimized 32/64 bit S/390 version of wcpcpy. |
| 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 * wcpcpy (const wchar_t *dest, const wchar_t *src) |
| Copy string src to dest returning a pointer to its end. |
| |
| Register usage: |
| -r0=border-len for switching to vector-instructions |
| -r1=tmp |
| -r2=dest and return value |
| -r3=src |
| -r4=tmp |
| -r5=current_len |
| -v16=part of src |
| -v17=index of zero |
| -v18=part of src |
| */ |
| ENTRY(__wcpcpy_vx) |
| .machine "z13" |
| .machinemode "zarch_nohighgprs" |
| |
| vlbb %v16,0(%r3),6 /* Load s until next 4k-byte boundary. */ |
| lcbb %r1,0(%r3),6 /* Get bytes to 4k-byte boundary or 16. */ |
| |
| tmll %r3,3 /* Test if s is 4-byte aligned? */ |
| jne .Lfallback /* And use common-code variant if not. */ |
| |
| vfenezf %v17,%v16,%v16 /* Find element not equal with zero search. */ |
| vlgvb %r5,%v17,7 /* Load zero index or 16 if not found. */ |
| clrjl %r5,%r1,.Lfound_align /* If found zero within loaded bytes, |
| copy bytes before and return. */ |
| |
| /* Align s to 16 byte. */ |
| risbgn %r4,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */ |
| lghi %r5,15 /* current_len = 15. */ |
| slr %r5,%r4 /* Compute highest index to 16byte boundary. */ |
| |
| vstl %v16,%r5,0(%r2) /* Copy loaded characters - no zero. */ |
| ahi %r5,1 /* Start loop at next character. */ |
| |
| /* Find zero in 16byte aligned loop. */ |
| .Lloop: |
| vl %v16,0(%r5,%r3) /* Load s. */ |
| vfenezfs %v17,%v16,%v16 /* Find element not equal with zero search. */ |
| je .Lfound_v16_0 /* Jump away if zero was found. */ |
| vl %v18,16(%r5,%r3) /* Load next part of s. */ |
| vst %v16,0(%r5,%r2) /* Store previous part without zero to dst. */ |
| vfenezfs %v17,%v18,%v18 |
| je .Lfound_v18_16 |
| vl %v16,32(%r5,%r3) |
| vst %v18,16(%r5,%r2) |
| vfenezfs %v17,%v16,%v16 |
| je .Lfound_v16_32 |
| vl %v18,48(%r5,%r3) |
| vst %v16,32(%r5,%r2) |
| vfenezfs %v17,%v18,%v18 |
| je .Lfound_v18_48 |
| vst %v18,48(%r5,%r2) |
| |
| aghi %r5,64 |
| j .Lloop /* No zero found -> loop. */ |
| |
| .Lfound_v16_32: |
| aghi %r5,32 |
| .Lfound_v16_0: |
| la %r3,0(%r5,%r2) |
| vlgvb %r1,%v17,7 /* Load byte index of zero. */ |
| aghi %r1,3 /* Also copy remaining bytes of zero. */ |
| vstl %v16,%r1,0(%r3) /* Copy characters including zero. */ |
| lay %r2,-3(%r1,%r3) /* Return pointer to zero. */ |
| br %r14 |
| |
| .Lfound_v18_48: |
| aghi %r5,32 |
| .Lfound_v18_16: |
| la %r3,16(%r5,%r2) |
| vlgvb %r1,%v17,7 /* Load byte index of zero. */ |
| aghi %r1,3 /* Also copy remaining bytes of zero. */ |
| vstl %v18,%r1,0(%r3) /* Copy characters including zero. */ |
| lay %r2,-3(%r1,%r3) /* Return pointer to zero. */ |
| br %r14 |
| |
| .Lfound_align: |
| aghi %r5,3 /* Also copy remaining bytes of zero. */ |
| vstl %v16,%r5,0(%r2) /* Copy characters including zero. */ |
| lay %r2,-3(%r5,%r2) /* Return pointer to zero. */ |
| br %r14 |
| |
| .Lfallback: |
| jg __wcpcpy_c |
| END(__wcpcpy_vx) |
| #endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */ |
