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Diffstat (limited to 'sysdeps/s390/multiarch/wcscat-vx.S')
| -rw-r--r-- | sysdeps/s390/multiarch/wcscat-vx.S | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/sysdeps/s390/multiarch/wcscat-vx.S b/sysdeps/s390/multiarch/wcscat-vx.S new file mode 100644 index 0000000000..71f7b1a9cf --- /dev/null +++ b/sysdeps/s390/multiarch/wcscat-vx.S @@ -0,0 +1,175 @@ +/* Vector optimized 32/64 bit S/390 version of wcscat. + Copyright (C) 2015 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 * wcscat (wchar_t *dest, const wchar_t *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(__wcscat_vx) + .machine "z13" + .machinemode "zarch_nohighgprs" + + 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. */ + + /* __wcslen_c can handle non 4byte aligned pointers, + but __wcscpy_c not. Thus if either src or dest is + not 4byte aligned, use __wcscat_c. */ + tmll %r2,3 /* Test if s is 4-byte aligned? */ + jne .Lfallback /* And use common-code variant if not. */ + tmll %r3,3 /* Test if src is 4-byte aligned? */ + jne .Lfallback /* And use common-code variant if not. */ + + lgr %r0,%r2 /* Save destination pointer for return. */ + + /* WCSLEN + r1 = loaded bytes (tmp) + r4 = zero byte index (tmp) + r2 = dst + */ + + vfenezf %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. */ + vfenezfs %v16,%v16,%v16 /* Find element not equal with zero search. */ + je .Llen_found /* Jump away if zero was found. */ + vl %v16,16(%r5,%r2) + vfenezfs %v16,%v16,%v16 + je .Llen_found16 + vl %v16,32(%r5,%r2) + vfenezfs %v16,%v16,%v16 + je .Llen_found32 + vl %v16,48(%r5,%r2) + vfenezfs %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: + /* WCSCPY + %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. */ + + 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,.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. */ + vfenezfs %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) /* Save previous part without zero to dst. */ + vfenezfs %v17,%v18,%v18 + je .Lcpy_found_v18_16 + vl %v16,32(%r5,%r3) + vst %v18,16(%r5,%r2) + vfenezfs %v17,%v16,%v16 + je .Lcpy_found_v16_32 + vl %v18,48(%r5,%r3) + vst %v16,32(%r5,%r2) + vfenezfs %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. */ + aghi %r1,3 /* Also copy remaining bytes 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. */ + aghi %r1,3 /* Also copy remaining bytes of zero. */ + vstl %v18,%r1,0(%r4) /* Copy characters including zero. */ + lgr %r2,%r0 /* Load saved dest-ptr. */ + br %r14 + +.Lcpy_found_align: + aghi %r5,3 /* Also copy remaining bytes of found zero. */ + vstl %v16,%r5,0(%r2) /* Copy characters including zero. */ + lgr %r2,%r0 /* Load saved dest-ptr. */ + br %r14 +.Lfallback: + jg __wcscat_c +END(__wcscat_vx) +#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */ |