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+/* Vector optimized 32/64 bit S/390 version of wcspbrk.
+ 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 *wcspbrk (const wchar_t *s, const wchar_t * accept)
+ The wcspbrk() function locates the first occurrence in the string s
+ of any of the characters in the string accept and returns a pointer
+ to that character or NULL if not found.
+
+ This method checks the length of accept 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 accept-string
+ r2: pointer to start of search-string
+ r0: loaded byte count of vlbb search-string (32bit unsigned)
+ r4: found byte index (32bit unsigned)
+ r1: current return len (64bit unsigned)
+ v16: search-string
+ v17: accept-string
+ v18: temp-vreg
+
+ ONLY FOR SLOW:
+ v19: first accept-string
+ v20: zero for preparing acc-vector
+ v21: global mask; 1 indicates a match between
+ search-string-vreg and any accept-character
+ v22: current mask; 1 indicates a match between
+ search-string-vreg and any accept-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 accept-string
+ r6: zero-index in search-string or 16 if no zero
+ or min(zero-index, loaded byte count)
+ r8: >0, if former accept-string-part contains a zero,
+ otherwise =0;
+ r9: loaded byte count of vlbb accept-string
+*/
+ENTRY(__wcspbrk_vx)
+ .machine "z13"
+ .machinemode "zarch_nohighgprs"
+
+ tmll %r2,3 /* Test if s is 4-byte aligned? */
+ jne .Lfallback /* And use common-code variant if not. */
+
+ /*
+ Check if accept-string fits in one vreg:
+ ----------------------------------------
+ */
+ vlbb %v17,0(%r3),6 /* Load accept. */
+ lcbb %r0,0(%r3),6
+ jo .Lcheck_onbb /* Special case if accept lays
+ on block-boundary. */
+
+.Lcheck_notonbb:
+ lghi %r1,0 /* Zero out current len. */
+ vlgvf %r0,%v17,0 /* Get first element. */
+ clije %r0,0,.Lfast_end_null /* Return null if accept is empty. */
+
+ vistrfs %v17,%v17 /* Fill with zeros after first zero. */
+ je .Lfast /* Zero found -> accept fits in one vreg. */
+ j .Lslow /* No zero -> accept exceeds one vreg */
+
+
+.Lcheck_onbb:
+ /* Accept lays on block-boundary. */
+ nill %r0,65532 /* Recognize only fully loaded characters. */
+ je .Lcheck_onbb2 /* Reload vr, if we loaded no full wchar_t. */
+ vfenezf %v18,%v17,%v17 /* Search zero in loaded accept bytes. */
+ vlgvb %r4,%v18,7 /* Get index of zero or 16 if not found. */
+ clrjl %r4,%r0,.Lcheck_notonbb /* Zero index < loaded bytes count ->
+ accept fits in one vreg;
+ Fill with zeros and proceed
+ with FAST. */
+.Lcheck_onbb2:
+ vl %v17,0(%r3) /* Load accept, which exceeds loaded bytes. */
+ j .Lcheck_notonbb /* Check if accept fits in one vreg. */
+
+
+ /*
+ Search s for accept in one vreg
+ -------------------------------
+ */
+.Lfast:
+ /* Complete accept-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. */
+
+ vfaezfs %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. */
+ /* If found index is within loaded bytes, return with found
+ element index (=equal count). */
+ clrjl %r4,%r0,.Lfast_loop_found2
+
+ /* 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. */
+
+.Lfast_loop:
+ vl %v16,0(%r1,%r2) /* Load search-string. */
+ vfaezfs %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)
+ vfaezfs %v18,%v16,%v17,0
+ jno .Lfast_loop_found16
+
+ vl %v16,32(%r1,%r2)
+ vfaezfs %v18,%v16,%v17,0
+ jno .Lfast_loop_found32
+
+ vl %v16,48(%r1,%r2)
+ vfaezfs %v18,%v16,%v17,0
+ jno .Lfast_loop_found48
+
+ aghi %r1,64
+ j .Lfast_loop /* Loop if no element was unequal to accept
+ 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. */
+.Lfast_loop_found2:
+ srlg %r5,%r4,2 /* Convert byte-index to character-index. */
+ vlgvf %r0,%v16,0(%r5) /* Get found element. */
+ clije %r0,0,.Lfast_end_null /* Return null if no accept-char found */
+ algfr %r1,%r4 /* Add found index of char to current len. */
+ la %r2,0(%r1,%r2) /* And return pointer to first equal char. */
+ br %r14
+
+.Lfast_end_null:
+ lghi %r2,0 /* Return null if no character is equal. */
+ br %r14
+
+
+
+
+ /*
+ Search s for accept in multiple vregs
+ -------------------------------------
+ */
+.Lslow:
+ /* Save registers. */
+ vlvgg %v30,%r6,0
+ vlvgp %v31,%r8,%r9
+
+ /* Accept 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. */
+
+ /* 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 16byte boundary;
+ needs highest index, left bytes are 0. */
+ ahi %r0,1 /* Work with loaded byte count. */
+ vzero %v21 /* Zero out global mask. */
+ lghi %r5,0 /* Set current len of accept-string to zero. */
+ vfenezf %v18,%v16,%v16 /* Find zero in current string-part. */
+ lghi %r8,0 /* There is no zero in first accept-part. */
+ vlgvb %r6,%v18,7 /* Load byte index of zero or 16 if no zero. */
+ clije %r6,0,.Lslow_end_null /* If first element is zero
+ (end of string) -> return null */
+ 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. */
+ vfeef %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 if no match. */
+ /* 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_null
+ /* All elements are zero (=no match) -> proceed with next str-part. */
+
+ vlr %v17,%v19 /* Load first part of accept (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 accept to zero. */
+ vfenezf %v18,%v16,%v16 /* Find zero in current string-part. */
+ lghi %r8,0 /* There is no zero in first accept-part. */
+ vlgvb %r6,%v18,7 /* Load byte index of zero or 16 if no zero. */
+ clije %r6,0,.Lslow_end_null /* If first element is zero
+ (end of string) -> return null. */
+
+.Lslow_loop_acc:
+ vfaef %v22,%v16,%v17,4 /* Create matching-mask (1 in mask ->
+ Character matches any accepted character in
+ this accept-string-part) IN=0, RT=1. */
+ vlgvf %r4,%v22,0 /* Get result of first element. */
+ /* First element is equal to any accepted characters
+ (all other parts of accept cannot lead to a match before this one)
+ -> current len is pointing to first element
+ -> return found */
+ clijh %r4,0,.Lslow_end_found
+ 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 the last acc-part
+ -> add index to current len and
+ end. */
+ vlbb %v17,16(%r5,%r3),6 /* Load next accept part. */
+ aghi %r5,16 /* Increment current len of accept-string. */
+ lcbb %r9,0(%r5,%r3),6 /* Get loaded byte count of accept-string. */
+ jo .Lslow_next_acc_onbb /* Jump away ifaccept-string is
+ on block-boundary. */
+.Lslow_next_acc_notonbb:
+ vistrfs %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 accept-part: fill zeros with first-accept-character. */
+ vlgvf %r8,%v17,0 /* Load first element of acc-part. */
+ clije %r8,0,.Lslow_next_str /* Proceed with next string-part,
+ If first char in this part of accept
+ is a zero. */
+ /* r8>0 -> zero found in this acc-part. */
+ vrepf %v18,%v17,0 /* Replicate first char accross all chars. */
+ vceqf %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 /* Accept part is prepared -> process. */
+
+.Lslow_next_acc_onbb:
+ nill %r9,65532 /* Recognize only fully loaded characters. */
+ je .Lslow_next_acc_onbb2 /* Reload vr, if no full wchar_t. */
+ vfenezf %v18,%v17,%v17 /* Find zero in loaded bytes of accept 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. */
+.Lslow_next_acc_onbb2:
+ 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_null:
+ lghi %r1,0 /* Return null if no character is equal. */
+ j .Lslow_end
+
+.Lslow_loop_found:
+ vlgvb %r4,%v18,7 /* Load byte index of found element. */
+ srlg %r5,%r4,2 /* Convert byte-index to character-index. */
+ vlgvf %r0,%v16,0(%r5) /* Get found element. */
+ clije %r0,0,.Lslow_end_null /* Return null if no acc-char found. */
+
+.Lslow_index_found:
+ algfr %r1,%r4 /* Add found index of char to current len. */
+.Lslow_end_found:
+ la %r1,0(%r1,%r2) /* And return pointer to first equal char. */
+
+.Lslow_end:
+ /* Restore registers. */
+ vlgvg %r6,%v30,0
+ vlgvg %r8,%v31,0
+ vlgvg %r9,%v31,1
+ lgr %r2,%r1
+ br %r14
+.Lfallback:
+ jg __wcspbrk_c
+END(__wcspbrk_vx)
+#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */