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Diffstat (limited to 'sysdeps/s390/multiarch/wcsncmp-vx.S')
| -rw-r--r-- | sysdeps/s390/multiarch/wcsncmp-vx.S | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/sysdeps/s390/multiarch/wcsncmp-vx.S b/sysdeps/s390/multiarch/wcsncmp-vx.S new file mode 100644 index 0000000000..e77f17dcaf --- /dev/null +++ b/sysdeps/s390/multiarch/wcsncmp-vx.S @@ -0,0 +1,177 @@ +/* Vector optimized 32/64 bit S/390 version of wcsncmp. + Copyright (C) 2015-2016 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 + +/* int wcsncmp (const wchar_t *s1, const wchar_t *s2, size_t n) + Compare at most n characters of two strings. + + Register usage: + -r0=tmp + -r1=tmp + -r2=s1 + -r3=s2 + -r4=n + -r5=current_len + -v16=part of s1 + -v17=part of s2 + -v18=index of unequal +*/ +ENTRY(__wcsncmp_vx) + .machine "z13" + .machinemode "zarch_nohighgprs" + +# if !defined __s390x__ + llgfr %r4,%r4 +# endif /* !defined __s390x__ */ + + clgije %r4,0,.Lend_equal /* Nothing to do if n == 0. */ + + /* Check range of n and convert to byte-count. */ +# ifdef __s390x__ + tmhh %r4,49152 /* Test bit 0 or 1 of maxlen. */ + lghi %r1,-4 /* Max byte-count is 18446744073709551612. */ +# else + tmlh %r4,49152 /* Test bit 0 or 1 of maxlen. */ + llilf %r1,4294967292 /* Max byte-count is 4294967292. */ +# endif /* !__s390x__ */ + sllg %r4,%r4,2 /* Convert character-count to byte-count. */ + locgrne %r4,%r1 /* Use max byte-count, if bit 0/1 was one. */ + + /* Check first character without vector load. */ + lghi %r5,4 /* current_len = 4 bytes. */ + /* Check s1/2[0]. */ + lt %r0,0(%r2) + l %r1,0(%r3) + je .Lend_cmp_one_char + crjne %r0,%r1,.Lend_cmp_one_char + +.Lloop: + vlbb %v17,0(%r5,%r3),6 /* Load s2 to block boundary. */ + vlbb %v16,0(%r5,%r2),6 /* Load s1 to block boundary. */ + lcbb %r0,0(%r5,%r2),6 /* Get loaded byte count of s1. */ + jo .Llt16_1 /* Jump away if vector not fully loaded. */ + lcbb %r1,0(%r5,%r3),6 /* Get loaded byte count of s2. */ + jo .Llt16_2 /* Jump away if vector not fully loaded. */ + aghi %r5,16 /* Both vectors are fully loaded. */ + vfenezfs %v18,%v16,%v17 /* Compare not equal with zero search. */ + clgrjhe %r5,%r4,.Llastcmp /* If current_len >= n ->last compare. */ + jno .Lfound + + vlbb %v17,0(%r5,%r3),6 + vlbb %v16,0(%r5,%r2),6 + lcbb %r0,0(%r5,%r2),6 + jo .Llt16_1 + lcbb %r1,0(%r5,%r3),6 + jo .Llt16_2 + aghi %r5,16 + vfenezfs %v18,%v16,%v17 + clgrjhe %r5,%r4,.Llastcmp + jno .Lfound + + vlbb %v17,0(%r5,%r3),6 + vlbb %v16,0(%r5,%r2),6 + lcbb %r0,0(%r5,%r2),6 + jo .Llt16_1 + lcbb %r1,0(%r5,%r3),6 + jo .Llt16_2 + aghi %r5,16 + vfenezfs %v18,%v16,%v17 + clgrjhe %r5,%r4,.Llastcmp + jno .Lfound + + vlbb %v17,0(%r5,%r3),6 + vlbb %v16,0(%r5,%r2),6 + lcbb %r0,0(%r5,%r2),6 + jo .Llt16_1 + lcbb %r1,0(%r5,%r3),6 + jo .Llt16_2 + aghi %r5,16 + vfenezfs %v18,%v16,%v17 + clgrjhe %r5,%r4,.Llastcmp + jno .Lfound + + j .Lloop + +.Llt16_1: + lcbb %r1,0(%r5,%r3),6 /* Get loaded byte count of s2. */ +.Llt16_2: + clr %r0,%r1 /* Compare logical. */ + locrh %r0,%r1 /* Compute minimum of bytes loaded. */ + nill %r0,65532 /* Align bytes loaded to full characters. */ + jz .Lcmp_one_char /* Jump away if no full char is available. */ +.Llt_cmp: + algfr %r5,%r0 /* Add smallest loaded bytes to current_len. */ + vfenezfs %v18,%v16,%v17 /* Compare not equal with zero search. */ + clgrj %r5,%r4,10,.Llastcmp /* If current_len >= n -> last compare */ + vlgvb %r1,%v18,7 /* Get not equal index or 16 if all equal. */ + clrjl %r1,%r0,.Lfound /* Jump away if miscompare is within + loaded bytes; (index < loaded-bytes) */ + j .Lloop + +.Lcmp_one_char: + /* At least one of both strings is not 4-byte aligned + and there is no full character before next block-boundary. + Compare one character to get over the boundary and + proceed with normal loop! */ + vlef %v16,0(%r5,%r2),0 /* Load one character. */ + lghi %r0,4 /* Loaded byte count is 4. */ + vlef %v17,0(%r5,%r3),0 + j .Llt_cmp /* Proceed with comparision. */ + +.Llastcmp: + /* Use comparision result only if located within first n characters. + %r0: loaded byte count in vreg; + %r5: current_len; + %r4: n; + (current_len - n): [0...16[ + First ignored match index: loaded bytes - (current_len-n): ]0...16] + */ + slgr %r5,%r4 /* %r5 = current_len - n. */ + slr %r0,%r5 /* %r0 = first ignored match index. */ + vlgvb %r4,%v18,7 /* Get not equal index or 16 if all equal. */ + clrjl %r4,%r0,.Lfound2 /* Jump away if miscompare is within + loaded bytes and below n bytes. */ +.Lend_equal: + lghi %r2,0 + br %r14 + +.Lfound: + /* Difference or end of string. */ + /* vfenezf found an unequal element or zero. + This instruction compares unsigned words, but wchar_t is signed. + Thus we have to compare the found element again. */ + vlgvb %r4,%v18,7 /* Extract not equal byte-index. */ +.Lfound2: + srl %r4,2 /* And convert it to character-index. */ + vlgvf %r0,%v16,0(%r4) /* Load character-values. */ + vlgvf %r1,%v17,0(%r4) +.Lend_cmp_one_char: + cr %r0,%r1 + je .Lend_equal + lghi %r2,1 + lghi %r1,-1 + locgrl %r2,%r1 + br %r14 +END(__wcsncmp_vx) +#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */ |