| /* Vector optimized 32/64 bit S/390 version of strcspn. |
| 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 |
| |
| /* size_t strcspn (const char *s, const char * reject) |
| The strcspn() function calculates the length of the initial segment |
| of s which consists entirely of characters not in reject. |
| |
| This method checks the length of reject string. If it fits entirely |
| in one vector register, a fast algorithm is used, which does not need |
| to check multiple parts of accept-string. Otherwise a slower full |
| check of accept-string is used. |
| |
| register overview: |
| r3: pointer to start of reject-string |
| r2: pointer to start of search-string |
| r0: loaded byte count of vlbb search-string |
| r4: found byte index |
| r1: current return len |
| v16: search-string |
| v17: reject-string |
| v18: temp-vreg |
| |
| ONLY FOR SLOW: |
| v19: first reject-string |
| v20: zero for preparing acc-vector |
| v21: global mask; 1 indicates a match between |
| search-string-vreg and any reject-character |
| v22: current mask; 1 indicates a match between |
| search-string-vreg and any reject-character in current acc-vreg |
| v24: one for result-checking of former string-part |
| v30, v31: for re-/storing registers r6, r8, r9 |
| r5: current len of reject-string |
| r6: zero-index in search-string or 16 if no zero |
| or min(zero-index, loaded byte count) |
| r8: >0, if former reject-string-part contains a zero, |
| otherwise =0; |
| r9: loaded byte count of vlbb reject-string |
| */ |
| ENTRY(__strcspn_vx) |
| .machine "z13" |
| .machinemode "zarch_nohighgprs" |
| |
| /* |
| Check if reject-string fits in one vreg: |
| ---------------------------------------- |
| */ |
| vlbb %v17,0(%r3),6 /* Load reject. */ |
| lghi %r1,0 /* Zero out current len. */ |
| lcbb %r0,0(%r3),6 |
| jo .Lcheck_onbb /* Special case if reject |
| lays on block-boundary. */ |
| .Lcheck_notonbb: |
| vistrbs %v17,%v17 /* Fill with zeros after first zero. */ |
| je .Lfast /* Zero found -> reject fits in one vreg. */ |
| j .Lslow /* No zero -> reject exceeds one vreg. */ |
| |
| |
| .Lcheck_onbb: |
| /* Reject lays on block-boundary. */ |
| vfenezb %v18,%v17,%v17 /* Search zero in loaded reject bytes. */ |
| vlgvb %r4,%v18,7 /* Get index of zero or 16 if not found. */ |
| clrjl %r4,%r0,.Lcheck_notonbb /* Zero index < loaded bytes count -> |
| Reject fits in one vreg; |
| Fill with zeros and proceed |
| with FAST. */ |
| vl %v17,0(%r3) /* Load reject, which exceeds loaded bytes. */ |
| j .Lcheck_notonbb /* Check if reject fits in one vreg. */ |
| |
| |
| /* |
| Search s for reject in one vreg |
| ------------------------------- |
| */ |
| .Lfast: |
| /* Complete reject-string in v17 and remaining bytes are zero. */ |
| |
| vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */ |
| lcbb %r0,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */ |
| |
| vfaezbs %v18,%v16,%v17,0 /* Find first element in v16 |
| unequal to any in v17 |
| or first zero element. */ |
| |
| vlgvb %r4,%v18,7 /* Load byte index of found element. */ |
| clrjl %r4,%r0,.Lfast_loop_found2 /* If found index is within loaded |
| bytes, return with found element |
| index (=equal count). */ |
| |
| /* Align s to 16 byte. */ |
| risbgn %r4,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */ |
| lghi %r1,16 /* current_len = 16. */ |
| slr %r1,%r4 /* Compute bytes to 16bytes boundary. */ |
| |
| /* Process s in 16byte aligned loop. */ |
| .Lfast_loop: |
| vl %v16,0(%r1,%r2) /* Load search-string. */ |
| vfaezbs %v18,%v16,%v17,0 /* Find first element in v16 equal to any |
| in v17 or first zero element. */ |
| jno .Lfast_loop_found |
| |
| vl %v16,16(%r1,%r2) |
| vfaezbs %v18,%v16,%v17,0 |
| jno .Lfast_loop_found16 |
| |
| vl %v16,32(%r1,%r2) |
| vfaezbs %v18,%v16,%v17,0 |
| jno .Lfast_loop_found32 |
| |
| vl %v16,48(%r1,%r2) |
| vfaezbs %v18,%v16,%v17,0 |
| jno .Lfast_loop_found48 |
| |
| aghi %r1,64 |
| j .Lfast_loop /* Loop if no element was unequal to reject |
| and not zero. */ |
| |
| /* Found equal or zero element. */ |
| .Lfast_loop_found48: |
| aghi %r1,16 |
| .Lfast_loop_found32: |
| aghi %r1,16 |
| .Lfast_loop_found16: |
| aghi %r1,16 |
| .Lfast_loop_found: |
| vlgvb %r4,%v18,7 /* Load byte index of found element or zero. */ |
| .Lfast_loop_found2: |
| algrk %r2,%r1,%r4 /* Add found index to current len. */ |
| br %r14 |
| |
| |
| |
| /* |
| Search s for reject in multiple vregs |
| ------------------------------------- |
| */ |
| .Lslow: |
| /* Save registers. */ |
| vlvgg %v30,%r6,0 |
| vlvgp %v31,%r8,%r9 |
| |
| /* Reject in v17 without zero. */ |
| vlr %v19,%v17 /* Save first acc-part for a fast reload. */ |
| vzero %v20 /* Zero for preparing acc-vector. */ |
| vone %v24 /* One for checking result of former |
| string-part. */ |
| |
| /* Align s to 16 byte. */ |
| risbg %r4,%r2,60,128+63,0 /* Test if s is aligned and |
| %r4 = bits 60-63 'and' 15. */ |
| je .Lslow_loop_str /* If s is aligned, loop aligned. */ |
| lghi %r0,15 |
| slr %r0,%r4 /* Compute highest index to load (15-x). */ |
| vll %v16,%r0,0(%r2) /* Load up to 16 byte boundary (vll needs |
| highest index, remaining bytes are 0). */ |
| ahi %r0,1 /* Work with loaded byte count. */ |
| vzero %v21 /* Zero out global mask. */ |
| lghi %r5,0 /* Set current len of reject-string to zero. */ |
| vfenezb %v18,%v16,%v16 /* Find zero in current string-part. */ |
| lghi %r8,0 /* There is no zero in first reject-part. */ |
| vlgvb %r6,%v18,7 /* Load byte index of zero or 16 if no zero. */ |
| clije %r6,0,.Lslow_end /* If first element is zero -> return 0. */ |
| clr %r0,%r6 /* cc==1 if loaded byte count < zero-index. */ |
| locrl %r6,%r0 /* Load on cc==1; zero-index = lbc. */ |
| j .Lslow_loop_acc |
| |
| |
| /* Process s in 16byte aligned loop. */ |
| .Lslow_next_str: |
| /* Check results of former processed str-part. */ |
| vfeeb %v18,%v21,%v24 /* Find first equal match in global mask |
| (ones in element). */ |
| vlgvb %r4,%v18,7 /* Get index of first one (=equal) or 16. */ |
| /* Equal-index < min(zero-index, loaded byte count) |
| -> Return pointer to equal element. */ |
| clrjl %r4,%r6,.Lslow_index_found |
| /* Zero-index < loaded byte count |
| -> Former str-part was last str-part |
| -> Return null */ |
| clrjl %r6,%r0,.Lslow_end_not_found |
| |
| /* All elements are zero (=no match) -> Proceed with next str-part. */ |
| vlr %v17,%v19 /* Load first part of reject (no zero). */ |
| algfr %r1,%r0 /* Add loaded byte count to current len. */ |
| |
| .Lslow_loop_str: |
| vl %v16,0(%r1,%r2) /* Load search-string. */ |
| lghi %r0,16 /* Loaded byte count is 16. */ |
| vzero %v21 /* Zero out global mask. */ |
| lghi %r5,0 /* Set current len of reject to zero. */ |
| vfenezb %v18,%v16,%v16 /* Find zero in current string-part. */ |
| lghi %r8,0 /* There is no zero in first reject-part. */ |
| vlgvb %r6,%v18,7 /* Load byte index of zero or 16 if no zero. */ |
| clije %r6,0,.Lslow_end /* If first element is zero (end of string) |
| -> Return current length. */ |
| |
| .Lslow_loop_acc: |
| vfaeb %v22,%v16,%v17,4 /* Create matching-mask (1 in mask -> |
| Character matches any rejected character in |
| this reject-string-part) IN=0, RT=1. */ |
| vlgvb %r4,%v22,0 /* Get result of first element. */ |
| /* First element is equal to any rejected characters? |
| (all other parts of reject cannot lead to a match before this one) |
| -> Return current len, which is pointing to this element. */ |
| clijh %r4,0,.Lslow_end |
| vo %v21,%v21,%v22 /* Global-mask = global-|matching-mask. */ |
| /* Proceed with next acc until end of acc is reached. */ |
| |
| |
| .Lslow_next_acc: |
| clijh %r8,0,.Lslow_next_str /* There was a zero in last reject-part |
| -> Add found index to current len |
| and end. */ |
| vlbb %v17,16(%r5,%r3),6 /* Load next reject part. */ |
| aghi %r5,16 /* Increment current len of reject-string. */ |
| lcbb %r9,0(%r5,%r3),6 /* Get loaded byte count of reject-string. */ |
| jo .Lslow_next_acc_onbb /* Jump away if reject-string is |
| on block-boundary. */ |
| .Lslow_next_acc_notonbb: |
| vistrbs %v17,%v17 /* Fill with zeros after first zero. */ |
| jo .Lslow_loop_acc /* No zero found -> no preparation needed. */ |
| |
| .Lslow_next_acc_prepare_zero: |
| /* Zero in reject-part: fill zeros with first-reject-character. */ |
| vlgvb %r8,%v17,0 /* Load first element of reject-part. */ |
| clije %r8,0,.Lslow_next_str /* Process next str-part if first |
| character in this part of reject |
| is a zero. */ |
| /* r8>0 -> zero found in this acc-part. */ |
| vrepb %v18,%v17,0 /* Replicate first char accross all chars. */ |
| vceqb %v22,%v20,%v17 /* Create a mask (v22) of null chars |
| by comparing with 0 (v20). */ |
| vsel %v17,%v18,%v17,%v22 /* Replace null chars with first char. */ |
| j .Lslow_loop_acc /* Reject-string part is prepared. */ |
| |
| .Lslow_next_acc_onbb: |
| vfenezb %v18,%v17,%v17 /* Find zero in loaded bytes of reject part. */ |
| vlgvb %r8,%v18,7 /* Load byte index of zero. */ |
| clrjl %r8,%r9,.Lslow_next_acc_notonbb /* Found a zero in loaded bytes |
| -> Prepare vreg. */ |
| vl %v17,0(%r5,%r3) /* Load over boundary ... */ |
| lghi %r8,0 /* r8=0 -> no zero in this part of acc, |
| check for zero is in jump-target. */ |
| j .Lslow_next_acc_notonbb /* ... and search for zero in |
| fully loaded vreg again. */ |
| |
| .Lslow_end_not_found: |
| algfr %r1,%r6 /* Add zero-index to current len. */ |
| j .Lslow_end |
| .Lslow_index_found: |
| algfr %r1,%r4 /* Add found index of char to current len. */ |
| .Lslow_end: |
| lgr %r2,%r1 |
| /* Restore registers. */ |
| vlgvg %r6,%v30,0 |
| vlgvg %r8,%v31,0 |
| vlgvg %r9,%v31,1 |
| br %r14 |
| END(__strcspn_vx) |
| #endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */ |
