diff options
Diffstat (limited to 'newlib/libc/machine/mips/strcmp.S')
| -rw-r--r-- | newlib/libc/machine/mips/strcmp.S | 261 |
1 files changed, 0 insertions, 261 deletions
diff --git a/newlib/libc/machine/mips/strcmp.S b/newlib/libc/machine/mips/strcmp.S deleted file mode 100644 index b1d757ee3..000000000 --- a/newlib/libc/machine/mips/strcmp.S +++ /dev/null @@ -1,261 +0,0 @@ -/* - * Copyright (c) 2014 - * Imagination Technologies Limited. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. 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. - * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY IMAGINATION TECHNOLOGIES LIMITED ``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 IMAGINATION TECHNOLOGIES LIMITED 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. - */ - -#ifdef ANDROID_CHANGES -# include "machine/asm.h" -# include "machine/regdef.h" -#elif _LIBC -# include <sysdep.h> -# include <regdef.h> -# include <sys/asm.h> -#elif _COMPILING_NEWLIB -# include "machine/asm.h" -# include "machine/regdef.h" -#else -# include <regdef.h> -# include <sys/asm.h> -#endif - -/* Technically strcmp should not read past the end of the strings being - compared. We will read a full word that may contain excess bits beyond - the NULL string terminator but unless ENABLE_READAHEAD is set, we will not - read the next word after the end of string. Setting ENABLE_READAHEAD will - improve performance but is technically illegal based on the definition of - strcmp. */ -#ifdef ENABLE_READAHEAD -# define DELAY_READ -#else -# define DELAY_READ nop -#endif - -/* Testing on a little endian machine showed using CLZ was a - performance loss, so we are not turning it on by default. */ -#if defined(ENABLE_CLZ) && (__mips_isa_rev > 1) -# define USE_CLZ -#endif - -/* Some asm.h files do not have the L macro definition. */ -#ifndef L -# if _MIPS_SIM == _ABIO32 -# define L(label) $L ## label -# else -# define L(label) .L ## label -# endif -#endif - -/* Some asm.h files do not have the PTR_ADDIU macro definition. */ -#ifndef PTR_ADDIU -# ifdef USE_DOUBLE -# define PTR_ADDIU daddiu -# else -# define PTR_ADDIU addiu -# endif -#endif - -/* Allow the routine to be named something else if desired. */ -#ifndef STRCMP_NAME -# define STRCMP_NAME strcmp -#endif - -#ifdef ANDROID_CHANGES -LEAF(STRCMP_NAME, 0) -#else -LEAF(STRCMP_NAME) -#endif - .set nomips16 - .set noreorder - - or t0, a0, a1 - andi t0,0x3 - bne t0, zero, L(byteloop) - -/* Both strings are 4 byte aligned at this point. */ - - lui t8, 0x0101 - ori t8, t8, 0x0101 - lui t9, 0x7f7f - ori t9, 0x7f7f - -#define STRCMP32(OFFSET) \ - lw v0, OFFSET(a0); \ - lw v1, OFFSET(a1); \ - subu t0, v0, t8; \ - bne v0, v1, L(worddiff); \ - nor t1, v0, t9; \ - and t0, t0, t1; \ - bne t0, zero, L(returnzero) - -L(wordloop): - STRCMP32(0) - DELAY_READ - STRCMP32(4) - DELAY_READ - STRCMP32(8) - DELAY_READ - STRCMP32(12) - DELAY_READ - STRCMP32(16) - DELAY_READ - STRCMP32(20) - DELAY_READ - STRCMP32(24) - DELAY_READ - STRCMP32(28) - PTR_ADDIU a0, a0, 32 - b L(wordloop) - PTR_ADDIU a1, a1, 32 - -L(returnzero): - j ra - move v0, zero - -L(worddiff): -#ifdef USE_CLZ - subu t0, v0, t8 - nor t1, v0, t9 - and t1, t0, t1 - xor t0, v0, v1 - or t0, t0, t1 -# if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ - wsbh t0, t0 - rotr t0, t0, 16 -# endif - clz t1, t0 - and t1, 0xf8 -# if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ - neg t1 - addu t1, 24 -# endif - rotrv v0, v0, t1 - rotrv v1, v1, t1 - and v0, v0, 0xff - and v1, v1, 0xff - j ra - subu v0, v0, v1 -#else /* USE_CLZ */ -# if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ - andi t0, v0, 0xff - beq t0, zero, L(wexit01) - andi t1, v1, 0xff - bne t0, t1, L(wexit01) - - srl t8, v0, 8 - srl t9, v1, 8 - andi t8, t8, 0xff - beq t8, zero, L(wexit89) - andi t9, t9, 0xff - bne t8, t9, L(wexit89) - - srl t0, v0, 16 - srl t1, v1, 16 - andi t0, t0, 0xff - beq t0, zero, L(wexit01) - andi t1, t1, 0xff - bne t0, t1, L(wexit01) - - srl t8, v0, 24 - srl t9, v1, 24 -# else /* __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ */ - srl t0, v0, 24 - beq t0, zero, L(wexit01) - srl t1, v1, 24 - bne t0, t1, L(wexit01) - - srl t8, v0, 16 - srl t9, v1, 16 - andi t8, t8, 0xff - beq t8, zero, L(wexit89) - andi t9, t9, 0xff - bne t8, t9, L(wexit89) - - srl t0, v0, 8 - srl t1, v1, 8 - andi t0, t0, 0xff - beq t0, zero, L(wexit01) - andi t1, t1, 0xff - bne t0, t1, L(wexit01) - - andi t8, v0, 0xff - andi t9, v1, 0xff -# endif /* __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ */ - -L(wexit89): - j ra - subu v0, t8, t9 -L(wexit01): - j ra - subu v0, t0, t1 -#endif /* USE_CLZ */ - -/* It might seem better to do the 'beq' instruction between the two 'lbu' - instructions so that the nop is not needed but testing showed that this - code is actually faster (based on glibc strcmp test). */ -#define BYTECMP01(OFFSET) \ - lbu v0, OFFSET(a0); \ - lbu v1, OFFSET(a1); \ - beq v0, zero, L(bexit01); \ - nop; \ - bne v0, v1, L(bexit01) - -#define BYTECMP89(OFFSET) \ - lbu t8, OFFSET(a0); \ - lbu t9, OFFSET(a1); \ - beq t8, zero, L(bexit89); \ - nop; \ - bne t8, t9, L(bexit89) - -L(byteloop): - BYTECMP01(0) - BYTECMP89(1) - BYTECMP01(2) - BYTECMP89(3) - BYTECMP01(4) - BYTECMP89(5) - BYTECMP01(6) - BYTECMP89(7) - PTR_ADDIU a0, a0, 8 - b L(byteloop) - PTR_ADDIU a1, a1, 8 - -L(bexit01): - j ra - subu v0, v0, v1 -L(bexit89): - j ra - subu v0, t8, t9 - - .set at - .set reorder - -END(STRCMP_NAME) -#ifndef ANDROID_CHANGES -# ifdef _LIBC -libc_hidden_builtin_def (STRCMP_NAME) -# endif -#endif |