| /* Vector optimized 32/64 bit S/390 version of strcat. |
| 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 |
| |
| /* char * strcat (const char *dest, const char *src) |
| Concatenate two strings. |
| |
| Register usage: |
| -r0=saved dest pointer for return |
| -r1=tmp |
| -r2=dest |
| -r3=src |
| -r4=tmp |
| -r5=current_len |
| -v16=part of src |
| -v17=index of zero |
| -v18=part of src |
| */ |
| ENTRY(__strcat_vx) |
| .machine "z13" |
| .machinemode "zarch_nohighgprs" |
| |
| lgr %r0,%r2 /* Save destination pointer for return. */ |
| |
| /* STRLEN |
| r1 = loaded bytes (tmp) |
| r4 = zero byte index (tmp) |
| r2 = dst |
| */ |
| vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */ |
| lcbb %r1,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */ |
| |
| vfenezb %v16,%v16,%v16 /* Find element not equal with zero search. */ |
| vlgvb %r5,%v16,7 /* Load zero index or 16 if not found. */ |
| clrjl %r5,%r1,.Llen_end /* Found zero within loaded bytes, end. */ |
| |
| /* Align s to 16 byte. */ |
| risbgn %r1,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */ |
| lghi %r5,16 /* current_len = 16. */ |
| slr %r5,%r1 /* Compute bytes to 16bytes boundary. */ |
| |
| /* Find zero in 16byte aligned loop. */ |
| .Llen_loop: |
| vl %v16,0(%r5,%r2) /* Load s. */ |
| vfenezbs %v16,%v16,%v16 /* Find element not equal with zero search. */ |
| je .Llen_found /* Jump away if zero was found. */ |
| vl %v16,16(%r5,%r2) |
| vfenezbs %v16,%v16,%v16 |
| je .Llen_found16 |
| vl %v16,32(%r5,%r2) |
| vfenezbs %v16,%v16,%v16 |
| je .Llen_found32 |
| vl %v16,48(%r5,%r2) |
| vfenezbs %v16,%v16,%v16 |
| je .Llen_found48 |
| |
| aghi %r5,64 |
| j .Llen_loop /* No zero -> loop. */ |
| |
| .Llen_found48: |
| aghi %r5,16 |
| .Llen_found32: |
| aghi %r5,16 |
| .Llen_found16: |
| aghi %r5,16 |
| .Llen_found: |
| vlgvb %r4,%v16,7 /* Load byte index of zero. */ |
| algr %r5,%r4 |
| |
| .Llen_end: |
| /* STRCPY |
| %r1 = loaded bytes (tmp) |
| %r4 = zero byte index (tmp) |
| %r3 = curr src pointer |
| %r2 = curr dst pointer |
| */ |
| la %r2,0(%r5,%r2) /* strcpy at end of dst-string. */ |
| |
| 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. */ |
| |
| vfenezb %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,.Lcpy_found_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. */ |
| .Lcpy_loop: |
| vl %v16,0(%r5,%r3) /* Load s. */ |
| vfenezbs %v17,%v16,%v16 /* Find element not equal with zero search. */ |
| je .Lcpy_found_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. */ |
| vfenezbs %v17,%v18,%v18 |
| je .Lcpy_found_v18_16 |
| vl %v16,32(%r5,%r3) |
| vst %v18,16(%r5,%r2) |
| vfenezbs %v17,%v16,%v16 |
| je .Lcpy_found_v16_32 |
| vl %v18,48(%r5,%r3) |
| vst %v16,32(%r5,%r2) |
| vfenezbs %v17,%v18,%v18 |
| je .Lcpy_found_v18_48 |
| vst %v18,48(%r5,%r2) |
| |
| aghi %r5,64 |
| j .Lcpy_loop /* No zero -> loop. */ |
| |
| .Lcpy_found_v16_32: |
| aghi %r5,32 |
| .Lcpy_found_v16_0: |
| la %r4,0(%r5,%r2) |
| vlgvb %r1,%v17,7 /* Load byte index of zero. */ |
| vstl %v16,%r1,0(%r4) /* Copy characters including zero. */ |
| lgr %r2,%r0 /* Load saved dest-ptr. */ |
| br %r14 |
| |
| .Lcpy_found_v18_48: |
| aghi %r5,32 |
| .Lcpy_found_v18_16: |
| la %r4,16(%r5,%r2) |
| vlgvb %r1,%v17,7 /* Load byte index of zero. */ |
| vstl %v18,%r1,0(%r4) /* Copy characters including zero. */ |
| lgr %r2,%r0 /* Load saved dest-ptr. */ |
| br %r14 |
| |
| .Lcpy_found_align: |
| vstl %v16,%r5,0(%r2) /* Copy characters including zero. */ |
| lgr %r2,%r0 /* Load saved dest-ptr. */ |
| br %r14 |
| END(__strcat_vx) |
| #endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */ |
