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+/* Vector optimized 32/64 bit S/390 version of wmemchr.
+ 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 *wmemchr (const wchar_t *s, wchar_t c, size_t n)
+ Scans memory for character c
+ and returns pointer to first c.
+
+ Register usage:
+ -r0=tmp
+ -r1=tmp
+ -r2=s
+ -r3=c
+ -r4=n
+ -r5=current_len
+ -v16=part of s
+ -v17=index of found c
+ -v18=c replicated
+*/
+ENTRY(__wmemchr_vx)
+ .machine "z13"
+ .machinemode "zarch_nohighgprs"
+
+# if !defined __s390x__
+ llgfr %r4,%r4
+# endif /* !defined __s390x__ */
+
+ clgije %r4,0,.Lnf_end /* If len == 0 then exit. */
+
+ 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. */
+ llgfr %r0,%r0 /* Convert 32bit to 64bit. */
+
+ tmll %r2,3 /* Test if s is 4-byte aligned? */
+ jne .Lfallback /* And use common-code variant if not. */
+
+ vlvgf %v18,%r3,0 /* Generate vector which elements are all c. */
+ vrepf %v18,%v18,0
+ lghi %r5,16 /* current_len = 16. */
+
+ /* Check range of maxlen 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. */
+
+ clgrjhe %r0,%r4,.Llastcmp /* If (bytes to boundary) >= n,
+ jump to lastcmp. */
+
+ vfeefs %v17,%v16,%v18 /* Find c. */
+ vlgvb %r1,%v17,7 /* Load byte index of c. */
+ clgrjl %r1,%r0,.Lfound2 /* Found c is within loaded bytes. */
+
+ /* Align s to 16 byte. */
+ risbgn %r1,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */
+ slr %r5,%r1 /* Compute bytes to 16bytes boundary. */
+
+ lgr %r0,%r5 /* If %r5 + 64 < n? -> loop64. */
+ aghi %r0,64
+ clgrjl %r0,%r4,.Lloop64
+.Llt64:
+ vl %v16,0(%r5,%r2)
+ aghi %r5,16
+ clgrjhe %r5,%r4,.Llastcmp /* Do last compare if curr-len >= n. */
+ vfeefs %v17,%v16,%v18 /* Find c. */
+ jl .Lfound /* Jump away if c was found. */
+
+ vl %v16,0(%r5,%r2)
+ aghi %r5,16
+ clgrjhe %r5,%r4,.Llastcmp
+ vfeefs %v17,%v16,%v18
+ jl .Lfound
+
+ vl %v16,0(%r5,%r2)
+ aghi %r5,16
+ clgrjhe %r5,%r4,.Llastcmp
+ vfeefs %v17,%v16,%v18
+ jl .Lfound
+
+ vl %v16,0(%r5,%r2)
+ aghi %r5,16
+
+.Llastcmp:
+ /* Use comparision result only if located within first n characters.
+ %r5: current_len;
+ %r4: n;
+ (current_len - n): [0...16[
+ first ignored match index = vr-width - (current_len - n) ]0...16]
+ */
+ vfeefs %v17,%v16,%v18 /* Find c. */
+ slgrk %r4,%r5,%r4 /* %r5 = current_len - n. */
+ lghi %r0,16 /* Register width = 16. */
+ vlgvb %r1,%v17,7 /* Extract found index or 16 if all equal. */
+ slr %r0,%r4 /* %r0 = first ignored match index. */
+ clrjl %r1,%r0,.Lfound2 /* Go away if miscompare is below n bytes. */
+ /* c not found within n-bytes. */
+.Lnf_end:
+ lghi %r2,0 /* Return null. */
+ br %r14
+
+.Lfound48:
+ aghi %r5,16
+.Lfound32:
+ aghi %r5,16
+.Lfound16:
+ aghi %r5,16
+.Lfound0:
+ aghi %r5,16
+.Lfound:
+ vlgvb %r1,%v17,7 /* Load byte index of c. */
+.Lfound2:
+ slgfi %r5,16 /* current_len -=16 */
+ algr %r5,%r1 /* Zero byte index is added to current len. */
+ la %r2,0(%r5,%r2) /* Return pointer to c. */
+ br %r14
+
+.Lloop64:
+ vl %v16,0(%r5,%r2)
+ vfeefs %v17,%v16,%v18 /* Find c. */
+ jl .Lfound0 /* Jump away if c was found. */
+ vl %v16,16(%r5,%r2)
+ vfeefs %v17,%v16,%v18
+ jl .Lfound16
+ vl %v16,32(%r5,%r2)
+ vfeefs %v17,%v16,%v18
+ jl .Lfound32
+ vl %v16,48(%r5,%r2)
+ vfeefs %v17,%v16,%v18
+ jl .Lfound48
+
+ aghi %r5,64
+ lgr %r0,%r5 /* If %r5 + 64 < n? -> loop64. */
+ aghi %r0,64
+ clgrjl %r0,%r4,.Lloop64
+
+ j .Llt64
+.Lfallback:
+ jg __wmemchr_c
+END(__wmemchr_vx)
+#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */