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Diffstat (limited to 'sysdeps/s390/multiarch/strncat-vx.S')
| -rw-r--r-- | sysdeps/s390/multiarch/strncat-vx.S | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/sysdeps/s390/multiarch/strncat-vx.S b/sysdeps/s390/multiarch/strncat-vx.S new file mode 100644 index 0000000000..b9857c1233 --- /dev/null +++ b/sysdeps/s390/multiarch/strncat-vx.S @@ -0,0 +1,239 @@ +/* Vector optimized 32/64 bit S/390 version of strncat. + 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 + +/* char * strncat (const char *dest, const char *src, size_t n) + Concatenate two strings - at most n characters of src. + + Register usage: + -r0=saved dest pointer for return + -r1=tmp + -r2=dest + -r3=src + -r4=n + -r5=current_len + -r6=tmp + -r7=tmp + -v16=part of src + -v17=index of zero + -v18=part of src + -v31=register save area for r6, r7 +*/ +ENTRY(__strncat_vx) + .machine "z13" + .machinemode "zarch_nohighgprs" + +# if !defined __s390x__ + llgfr %r4,%r4 +# endif /* !defined __s390x__ */ + + clgfi %r4,0 + ber %r14 /* Nothing to do, if n == 0. */ + lgr %r0,%r2 /* Save destination pointer for return. */ + vlvgp %v31,%r6,%r7 /* Save registers. */ + + /* STRLEN + %r1 = loaded bytes (tmp) + %r6 = zero byte index (tmp) + %r2 = dst + */ + vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */ + lcbb %r1,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */ + + vfenezb %v16,%v16,%v16 /* Find element not equal with zero search. */ + vlgvb %r5,%v16,7 /* Load zero index or 16 if not found. */ + clrjl %r5,%r1,.Llen_end /* Found zero within loaded bytes, end. */ + + /* Align s to 16 byte. */ + risbgn %r1,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */ + lghi %r5,16 /* current_len = 16. */ + slr %r5,%r1 /* Compute bytes to 16bytes boundary. */ + + /* Find zero in 16byte aligned loop. */ +.Llen_loop: + vl %v16,0(%r5,%r2) /* Load s. */ + vfenezbs %v16,%v16,%v16 /* Find element not equal with zero search. */ + je .Llen_found /* Jump away if zero was found. */ + vl %v16,16(%r5,%r2) + vfenezbs %v16,%v16,%v16 + je .Llen_found16 + vl %v16,32(%r5,%r2) + vfenezbs %v16,%v16,%v16 + je .Llen_found32 + vl %v16,48(%r5,%r2) + vfenezbs %v16,%v16,%v16 + je .Llen_found48 + + aghi %r5,64 + j .Llen_loop /* No zero -> loop. */ + +.Llen_found48: + aghi %r5,16 +.Llen_found32: + aghi %r5,16 +.Llen_found16: + aghi %r5,16 +.Llen_found: + vlgvb %r1,%v16,7 /* Load byte index of zero. */ + algr %r5,%r1 + +.Llen_end: + /* STRCPY + %r1 = zero byte index (tmp) + %r6 = loaded bytes (tmp) + %r3 = curr src pointer + %r2 = curr dst pointer + %r7 = border, tmp + */ + la %r2,0(%r5,%r2) /* strcpy at end of dst-string. */ + + vlbb %v16,0(%r3),6 /* Load s until next 4k-byte boundary. */ + lcbb %r6,0(%r3),6 /* Get bytes to 4k-byte boundary or 16. */ + llgfr %r6,%r6 /* Convert 32bit to 64bit. */ + + lghi %r5,0 /* current_len = 0. */ + + clgrjle %r4,%r6,.Lcpy_remaining_v16 /* If n <= loaded-bytes + -> process remaining. */ + + /* n > loaded-byte-count. */ + vfenezb %v17,%v16,%v16 /* Find element not equal with zero search. */ + vlgvb %r1,%v17,7 /* Load zero index or 16 if not found. */ + clrjl %r1,%r6,.Lcpy_found_v16_store /* Found zero within loaded + bytes, copy and return. */ + + /* Align s to 16 byte. */ + risbgn %r7,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */ + lghi %r5,15 /* current_len = 15. */ + slr %r5,%r7 /* Compute highest index to 16byte boundary. */ + + /* Zero not found and n > loaded-byte-count. */ + vstl %v16,%r5,0(%r2) /* Copy loaded characters - no zero. */ + ahi %r5,1 /* Start loop at next character. */ + + /* + Now we are 16byte aligned, so we can load a full vreg + without page fault. + */ + lgr %r1,%r5 /* If %r5 + 64 < maxlen? -> loop64. */ + aghi %r1,64 + clgrjl %r1,%r4,.Lcpy_loop64 + + vl %v16,0(%r5,%r3) /* Load s. */ + clgijl %r4,17,.Lcpy_remaining_v16 /* If n <=16, + process remaining bytes. */ +.Lcpy_lt64: + lgr %r7,%r4 + slgfi %r7,16 /* border_len = n - 16. */ + + /* If current_len >= border then process remaining bytes. */ + clgrjhe %r5,%r7,.Lcpy_remaining_v16 + vfenezbs %v17,%v16,%v16 /* Find element not equal with zero search. */ + je .Lcpy_found_v16 /* 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. */ + aghi %r5,16 + + clgrjhe %r5,%r7,.Lcpy_remaining_v18 + vfenezbs %v17,%v18,%v18 + je .Lcpy_found_v18 + vl %v16,16(%r5,%r3) + vst %v18,0(%r5,%r2) + aghi %r5,16 + + clgrjhe %r5,%r7,.Lcpy_remaining_v16 + vfenezbs %v17,%v16,%v16 + je .Lcpy_found_v16 + vl %v18,16(%r5,%r3) + vst %v16,0(%r5,%r2) + aghi %r5,16 + +.Lcpy_remaining_v18: + vlr %v16,%v18 +.Lcpy_remaining_v16: + /* v16 contains the remaining bytes [1...16]. + Store remaining bytes and append string-termination. */ + vfenezb %v17,%v16,%v16 /* Find element not equal with zero search. */ + slgrk %r7,%r4,%r5 /* Remaining bytes = maxlen - current_len. */ + aghi %r7,-1 /* vstl needs highest index. */ + vlgvb %r1,%v17,7 /* Load zero index or 16 if not found. */ + la %r2,0(%r5,%r2) /* vstl has no index register. */ + /* Zero-index within remaining-bytes, store up to zero and end. */ + clgrjle %r1,%r7,.Lcpy_found_v16_store + vstl %v16,%r7,0(%r2) /* Store remaining bytes. */ + lghi %r1,0 + stc %r1,1(%r7,%r2) /* Store string-null-termination beyond n. */ +.Lcpy_end: + /* Restore saved registers. */ + vlgvg %r6,%v31,0 + vlgvg %r7,%v31,1 + lgr %r2,%r0 /* Load saved dest-ptr. */ + br %r14 + +.Lcpy_found_v16_32: + aghi %r5,32 + j .Lcpy_found_v16 +.Lcpy_found_v18_48: + aghi %r5,32 +.Lcpy_found_v18_16: + aghi %r5,16 +.Lcpy_found_v18: + vlr %v16,%v18 +.Lcpy_found_v16: + /* v16 contains a zero. Store remaining bytes to zero. current_len + has not reached border, thus checking for n is not needed! */ + vlgvb %r1,%v17,7 /* Load byte index of zero. */ + la %r2,0(%r5,%r2) +.Lcpy_found_v16_store: + vstl %v16,%r1,0(%r2) /* Copy characters including zero. */ + j .Lcpy_end + + /* Find zero in 16byte aligned loop. */ +.Lcpy_loop64: + vl %v16,0(%r5,%r3) /* Load s. */ + vfenezbs %v17,%v16,%v16 /* Find element not equal with zero search. */ + je .Lcpy_found_v16 /* 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. */ + vfenezbs %v17,%v18,%v18 + je .Lcpy_found_v18_16 + vl %v16,32(%r5,%r3) + vst %v18,16(%r5,%r2) + vfenezbs %v17,%v16,%v16 + je .Lcpy_found_v16_32 + vl %v18,48(%r5,%r3) + vst %v16,32(%r5,%r2) + vfenezbs %v17,%v18,%v18 + je .Lcpy_found_v18_48 + vst %v18,48(%r5,%r2) + + aghi %r5,64 + lgr %r1,%r5 /* If %r5 + 64 < maxlen? -> loop64. */ + aghi %r1,64 + clgrjl %r1,%r4,.Lcpy_loop64 + + vl %v16,0(%r5,%r3) /* Load s. */ + j .Lcpy_lt64 +END(__strncat_vx) +#endif /* HAVE_S390_VX_ASM_SUPPORT && IS_IN (libc) */ |