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Diffstat (limited to 'sysdeps/s390/multiarch/wcpcpy-vx.S')
| -rw-r--r-- | sysdeps/s390/multiarch/wcpcpy-vx.S | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/sysdeps/s390/multiarch/wcpcpy-vx.S b/sysdeps/s390/multiarch/wcpcpy-vx.S new file mode 100644 index 0000000000..30b1b47d10 --- /dev/null +++ b/sysdeps/s390/multiarch/wcpcpy-vx.S @@ -0,0 +1,114 @@ +/* Vector optimized 32/64 bit S/390 version of wcpcpy. + 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 * 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) */ |