diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc64/power7/strpbrk.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc64/power7/strpbrk.S | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc64/power7/strpbrk.S b/sysdeps/powerpc/powerpc64/power7/strpbrk.S new file mode 100644 index 0000000000..d6204a7754 --- /dev/null +++ b/sysdeps/powerpc/powerpc64/power7/strpbrk.S @@ -0,0 +1,148 @@ +/* Optimized strpbrk 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/>. */ + +#include <sysdep.h> + +/* char [r3] *strpbrk(const char [r4] *s, const char [r5] *accept) */ + + .machine power7 +EALIGN (strpbrk, 4, 0) + CALL_MCOUNT 3 + + lbz r10,0(r4) + cmpdi cr7,r10,0 /* accept[0] == '\0' ? */ + beq cr7,L(nullfound) + + /* The idea to speed up the algorithm is to create a lookup table + for fast check if input character should be considered. For ASCII + or ISO-8859-X character sets it has 256 positions. */ + + /* First the table should be cleared and to avoid unaligned accesses + when using the VSX stores the table address is aligned to 16 + bytes. */ + xxlxor v0,v0,v0 + + /* PPC64 ELF ABI stack is aligned to 16 bytes */ + addi r9,r1,-256 + + li r5,16 + li r6,32 + li r8,48 + addi r12,r9,64 + /* Clear the table with 0 values */ + stxvw4x v0,r0,r9 + addi r11,r9,128 + addi r7,r9,192 + stxvw4x v0,r9,r5 + li r0,1 + stxvw4x v0,r9,r6 + stxvw4x v0,r9,r8 + stxvw4x v0,r0,r12 + stxvw4x v0,r12,r5 + stxvw4x v0,r12,r6 + stxvw4x v0,r12,r8 + stxvw4x v0,r0,r11 + stxvw4x v0,r11,r5 + stxvw4x v0,r11,r6 + stxvw4x v0,r11,r8 + stxvw4x v0,r0,r7 + stxvw4x v0,r7,r5 + stxvw4x v0,r7,r6 + stxvw4x v0,r7,r8 + + /* Initialize the table as: + for (i=0; accept[i]; i++ + table[accept[i]]] = 1 */ + .p2align 4,,15 +L(init_table): + stbx r0,r9,r10 + lbzu r10,1(r4) + cmpdi r0,r10,0 + bne cr0,L(init_table) +L(finish_table): + /* set table[0] = 1 */ + li r4,1 + stb r4,0(r9) + b L(mainloop) + + /* Unrool the loop 4 times and check using the table as: + i = 0; + while (1) + { + if (table[input[i++]] == 1) + return (s[i -1] ? s + i - 1: NULL); + if (table[input[i++]] == 1) + return (s[i -1] ? s + i - 1: NULL); + if (table[input[i++]] == 1) + return (s[i -1] ? s + i - 1: NULL); + if (table[input[i++]] == 1) + return (s[i -1] ? s + i - 1: NULL); + } */ + .p2align 4 +L(unroll): + lbz r0,1(r3) + lbzx r8,r9,r0 + cmpwi cr6,r8,1 + beq cr6,L(checkend2) + lbz r10,2(r3) + lbzx r4,r9,r10 + cmpwi cr7,r4,1 + beq cr7,L(checkend3) + lbz r12,3(r3) + addi r3,r3,4 + lbzx r11,r9,r12 + cmpwi cr0,r11,1 + beq cr0,L(checkend) +L(mainloop): + lbz r12,0(r3) + addi r11,r3,1 + addi r5,r3,2 + addi r7,r3,3 + lbzx r6,r9,r12 + cmpwi cr1,r6,1 + bne cr1,L(unroll) + cmpdi cr0,r12,0 + beq cr0,L(nullfound) +L(end): + blr + + .p2align 4 +L(checkend): + cmpdi cr1,r12,0 + mr r3,r7 + bne cr1,L(end) +L(nullfound): + /* return NULL */ + li 3,0 + blr + + .p2align 4 +L(checkend2): + cmpdi cr7,r0,0 + mr r3,r11 + beq cr7,L(nullfound) + blr + + .p2align 4 +L(checkend3): + cmpdi cr6,r10,0 + mr r3,r5 + beq cr6,L(nullfound) + blr +END (strpbrk) +libc_hidden_builtin_def (strpbrk) |