--- /dev/null
+/* Optimized strspn implementation for POWER7.
+ Copyright (C) 2014 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/>. */
+
+#include <sysdep.h>
+
+#undef EALIGN
+#define EALIGN(name, alignt, words) \
+ .section ".text"; \
+ ENTRY_2(__strspn_power7) \
+ .align ALIGNARG(alignt); \
+ EALIGN_W_##words; \
+ BODY_LABEL(__strspn_power7): \
+ cfi_startproc; \
+ LOCALENTRY(__strspn_power7)
+
+#undef END
+#define END(name) \
+ cfi_endproc; \
+ TRACEBACK(__strspn_power7) \
+ END_2(__strspn_power7)
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
+#include <sysdeps/powerpc/powerpc64/power7/strspn.S>
--- /dev/null
+/* Copyright (C) 2014 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/>. */
+
+#include <string.h>
+
+#define STRSPN __strspn_ppc
+#undef weak_alias
+#define weak_alias(name, aliasname) \
+ extern __typeof (__strspn_ppc) aliasname \
+ __attribute__ ((weak, alias ("__strspn_ppc")));
+#if !defined(NOT_IN_libc) && defined(SHARED)
+# undef libc_hidden_builtin_def
+# define libc_hidden_builtin_def(name) \
+ __hidden_ver1(__strspn_ppc, __GI_strspn, __strspn_ppc);
+#endif
+
+extern __typeof (strspn) __strspn_ppc attribute_hidden;
+
+#include <string/strspn.c>
--- /dev/null
+/* Optimized strspn implementation for PowerPC64/POWER7.
+
+ Copyright (C) 2014 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/>. */
+
+/* size_t [r3] strspn (const char *string [r3],
+ const char *needleAccept [r4] */
+
+/* Performance gains are grabbed through following techniques:
+
+ > hashing of needle.
+ > hashing avoids scanning of duplicate entries in needle
+ across the string.
+ > initializing the hash table with Vector instructions
+ by quadword access.
+ > unrolling when scanning for character in string
+ across hash table. */
+
+/* Algorithm is as below:
+ 1. A empty hash table/dictionary is created comprising of
+ 256 ascii character set
+ 2. When hash entry is found in needle , the hash index
+ is initialized to 1
+ 3. The string is scanned until end and for every character,
+ its corresponding hash index is compared.
+ 4. initial length of string (count) until first hit of
+ accept needle to be found is set to 0
+ 4. If hash index is set to 1 for the index of string,
+ count is returned.
+ 5. Otherwise count is incremented and scanning continues
+ until end of string. */
+
+#include <sysdep.h>
+
+#undef strspn
+
+ .machine power7
+EALIGN(strspn, 4, 0)
+ CALL_MCOUNT 2
+
+ lbz r10, 0(r4) /* load r10 with needle (r4) */
+ addi r9, r1, -256 /* r9 is a hash of 256 bytes */
+
+ li r5, 16 /* set r5 = 16 as offset */
+ li r6, 32 /* set r6 = 32 as offset */
+ li r8, 48 /* set r8 = 48 as offset */
+
+/*Iniatliaze hash table with Zeroes in double indexed quadword accesses */
+ xxlxor v0, v0, v0 /* prepare for initializing hash */
+
+ stxvd2x v0, r0, r9 /* initialize 1st quadword */
+ stxvd2x v0, r9, r5
+ stxvd2x v0, r9, r6
+ stxvd2x v0, r9, r8 /* initialize 4th quadword */
+
+ addi r11, r9, 64 /* r11 is index to hash */
+
+ stxvd2x v0, r0, r11 /* initialize 5th quadword */
+ stxvd2x v0, r11, r5
+ stxvd2x v0, r11, r6
+ stxvd2x v0, r11, r8 /* initialize 8th quadword */
+
+ addi r11, r9, 128 /* r11 is index to hash */
+
+ stxvd2x v0, r0, r11 /* initialize 9th quadword */
+ stxvd2x v0, r11, r5
+ stxvd2x v0, r11, r6
+ stxvd2x v0, r11, r8 /* initialize 12th quadword */
+
+ addi r11, r9, 192 /* r11 is index to hash */
+
+ stxvd2x v0, r0, r11 /* initialize 13th quadword */
+ stxvd2x v0, r11, r5
+ stxvd2x v0, r11, r6
+ stxvd2x v0, r11, r8 /* initialize 16th quadword */
+
+ li r8, 1 /* r8=1, marker into hash if found in
+ needle */
+
+ cmpdi cr7, r10, 0 /* accept needle is NULL */
+ beq cr7, L(skipHashing) /* if needle is NULL, skip hashing */
+
+ .p2align 4 /* align section to 16 byte boundary */
+L(hashing):
+ stbx r8, r9, r10 /* update hash with marker for the pivot of
+ the needle */
+ lbzu r10, 1(r4) /* load needle into r10 and update to next */
+ cmpdi cr7, r10, 0 /* if needle is has reached NULL, continue */
+ bne cr7, L(hashing) /* loop to hash the needle */
+
+L(skipHashing):
+ li r10, 0 /* load counter = 0 */
+ b L(beginScan)
+
+ .p2align 4 /* align section to 16 byte boundary */
+L(scanUnroll):
+ lbzx r8, r9, r8 /* load r8 with hash value at index */
+ cmpwi cr7, r8, 0 /* if we hit marker in hash, we have found
+ accept needle */
+ beq cr7, L(ret1stIndex) /* we have hit accept needle, return the
+ count */
+
+ lbz r8, 1(r3) /* load string[1] into r8 */
+ addi r10, r10, 4 /* increment counter */
+ lbzx r8, r9, r8 /* load r8 with hash value at index */
+ cmpwi cr7, r8, 0 /* if we hit marker in hash, we have found
+ accept needle */
+ beq cr7, L(ret2ndIndex) /* we have hit accept needle, return the
+ count */
+
+ lbz r8, 2(r3) /* load string[2] into r8 */
+ lbzx r8, r9, r8 /* load r8 with hash value at index */
+ cmpwi cr7, r8, 0 /* if we hit marker in hash, we have found
+ accept needle */
+ beq cr7, L(ret3rdIndex) /* we have hit accept needle, return the
+ count */
+
+ lbz r8, 3(r3) /* load string[3] into r8 */
+ lbzx r8, r9, r8 /* load r8 with hash value at index */
+ addi r3, r3, 4 /* unroll factor , increment string by 4 */
+ cmpwi cr7, r8, 0 /* if we hit marker in hash, we have found
+ accept needle */
+ beq cr7,L(ret4thIndex) /* we have hit accept needle, return the
+ count */
+
+L(beginScan):
+ lbz r8, 0(r3) /* load string[0] into r8 */
+ addi r6, r10, 1 /* place holder for counter + 1 */
+ addi r5, r10, 2 /* place holder for counter + 2 */
+ addi r4, r10, 3 /* place holder for counter + 3 */
+ cmpdi cr7, r8, 0 /* if we hit marker in hash, we have found
+ accept needle */
+ bne cr7, L(scanUnroll) /* continue scanning */
+
+L(ret1stIndex):
+ mr r3, r10 /* update r3 for return */
+ blr /* return */
+
+L(ret2ndIndex):
+ mr r3, r6 /* update r3 for return */
+ blr /* return */
+
+L(ret3rdIndex):
+ mr r3, r5 /* update r3 for return */
+ blr /* return */
+
+L(ret4thIndex):
+ mr r3, r4 /* update r3 for return */
+ blr /* done */
+END(strspn)
+libc_hidden_builtin_def (strspn)
projects / thirdparty / glibc.git / commitdiff
