diff options
Diffstat (limited to 'newlib/libc/machine/nds32/strcmp.S')
| -rw-r--r-- | newlib/libc/machine/nds32/strcmp.S | 96 |
1 files changed, 0 insertions, 96 deletions
diff --git a/newlib/libc/machine/nds32/strcmp.S b/newlib/libc/machine/nds32/strcmp.S deleted file mode 100644 index f3f37fb3e..000000000 --- a/newlib/libc/machine/nds32/strcmp.S +++ /dev/null @@ -1,96 +0,0 @@ -/* -Copyright (c) 2013 Andes Technology Corporation. -All rights reserved. - -Redistribution and use in source and binary forms, with or without -modification, are permitted provided that the following conditions are met: - - Redistributions of source code must retain the above copyright - notice, this list of conditions and the following disclaimer. - - Redistributions in binary form must reproduce the above copyright - notice, this list of conditions and the following disclaimer in the - documentation and/or other materials provided with the distribution. - - The name of the company may not be used to endorse or promote - products derived from this software without specific prior written - permission. - -THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" -AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE -IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE -DISCLAIMED. IN NO EVENT SHALL RED HAT INCORPORATED BE LIABLE FOR ANY -DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES -(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; -LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND -ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS -SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - - Function: - strcmp - compare two strings. - Syntax: - int strcmp(const char *s1, const char *s2); - Description: - This function compares the two strings s1 and s2. It returns an - integer less than, equal to, or greater than zero if s1 is found, - respectively, to be less than, to match, or be greater than s2. - Return value: - strcmp returns an integer less than, equal to, or greater than - zero if s1 (or the first n bytes thereof) is found, respectively, - to be less than, to match, or be greater than s2. -*/ - .text - .align 2 - .globl strcmp - .type strcmp, @function -strcmp: - /* If s1 or s2 are unaligned, then compare bytes. */ - or $r5, $r1, $r0 - andi $r5, $r5, #3 - bnez $r5, .Lbyte_mode - - /* If s1 and s2 are word-aligned, compare them a word at a time. */ - lwi $r5, [$r0+(0)] - lwi $r3, [$r1+(0)] - bne $r5, $r3, .Lbyte_mode /* A difference was detected, so - search bytewise. */ - - /* It's more efficient to set bit mask outside the word_mode loop. */ - sethi $r4, hi20(0xFEFEFEFF) /* Set $r4 as -0x01010101. */ - ori $r4, $r4, lo12(0xFEFEFEFF) - sethi $r2, hi20(0x80808080) - ori $r2, $r2, lo12(0x80808080) - b .Ldetect_null - -.align 2 -.Lword_mode: - lmw.aim $r5, [$r0], $r5 - lmw.aim $r3, [$r1], $r3 - bne $r5, $r3, .Lbyte_mode - -.Ldetect_null: - /* #define DETECTNULL(X) (((X) - 0x01010101) & ~(X) & 0x80808080) - DETECTNULL returns nonzero if (long)X contains a NULL byte. */ - nor $r3, $r5, $r5 /* r3 = ~(X) */ - add $r5, $r5, $r4 /* r2 = ((X) - 0x01010101) */ - and $r5, $r5, $r3 /* r2 = ~(X) & ((X) - 0x01010101) */ - and $r5, $r5, $r2 /* r2= r2 & 0x80808080 */ - beqz $r5, .Lword_mode /* No NULL byte, compare next word. */ - - /* To get here, *a1 == *a2, thus if we find a null in *a1, - then the strings must be equal, so return zero. */ - movi $r0, #0 - ret - -.Lbyte_mode: - /* Byte-mode compare. */ - lbi.bi $r5, [$r0], #1 - lbi.bi $r3, [$r1], #1 - bne $r5, $r3, 1f /* Mismatch, done. */ - bnez $r5, .Lbyte_mode -1: - sub $r0, $r5, $r3 - ret - .size strcmp, .-strcmp |