diff options
Diffstat (limited to 'newlib/libc/machine/xscale/memcmp.c')
| -rw-r--r-- | newlib/libc/machine/xscale/memcmp.c | 112 |
1 files changed, 0 insertions, 112 deletions
diff --git a/newlib/libc/machine/xscale/memcmp.c b/newlib/libc/machine/xscale/memcmp.c deleted file mode 100644 index 1b85af45d..000000000 --- a/newlib/libc/machine/xscale/memcmp.c +++ /dev/null @@ -1,112 +0,0 @@ -#if defined __thumb__ - -#include "../../string/memcmp.c" - -#else - -#include <string.h> -#include "xscale.h" - -int -memcmp (const void * s1, const void * s2, size_t len) -{ - int result; - asm ( -#ifndef __OPTIMIZE_SIZE__ -" - cmp %2, #0x3 @ Is the length a multiple of four ? - bls 6f @ no = goto SLOW CHECK - and r2, %0, #0x3 @ get alignment of first pointer - and r3, %1, #0x3 @ get alignment of second pointer - cmp r2, r3 @ Do the two pointers share the same alignment ? - bne 6f @ no = goto SLOW CHECK - mov lr, %0 @ copy first pointer into LR - mov r4, %1 @ copy second pointer into R4 - cmp r2, #0x0 @ Are we comparing word aligned pointers ? - beq 3f @ yes = goto START WORD CHECK LOOP - b 1f @ jump to LOOP TEST -0: @ LOOP START - ldrb r2, [lr], #1 @ load byte from LR, post inc. -" PRELOADSTR("lr") " @ preload - ldrb r3, [r4], #1 @ load byte from R4, post inc. -" PRELOADSTR("r4") " @ preload - cmp r2, r3 @ are the two bytes the same ? - bne 5f @ no = goto EXIT - tst lr, #0x3 @ has the LR become word aligned ? - bne 1f @ no = skip the next test - cmp %2, #4 @ is the count >= 4 ? - bhs 3f @ yes = goto START WORD CHECK LOOP -1: @ LOOP TEST - sub %2, %2, #1 @ decrement count by one - cmn %2, #0x1 @ has the count reached -1 ? - bne 0b @ no = loop back to LOOP START - b 4f @ goto PASS END - -0: @ ?? - cmp %2, #0x7 @ Is the count a multiple of 8 ? - bls 3f @ no = goto ??? - ldmia lr,{r2, r3} @ get two words from first pointer, post inc - ldmia r4,{r5, r6} @ get two words from second pointer, post inc - sub %2, %2, #0x4 @ decrement count by 4 - cmp r2, r5 @ has the count reached ???? - bne 1f @ no = goto - sub %2, %2, #0x4 @ decrement the count by 4 - add lr, lr, #0x4 @ add 4 to first pointer - add r4, r4, #0x4 @ add 4 to second pointer - cmp r3, r6 @ ??? - beq 0b @ goto ??? -1: @ ?? - add %2, %2, #0x4 @ Add four to count - sub %0, lr, #0x4 @ decrement first pointer by 4 - sub %1, r4, #0x4 @ decrement second pointer by 4 - b 6f @ goto SLOW CHECK - -3: @ START WORD CHECK LOOP - cmp %2, #0x3 @ is the count <= 3 ? - bls 1f @ yes = goto CHECK BYTES BY HAND - ldr r2, [lr], #4 @ get word from LR, post inc - ldr r3, [r4], #4 @ get word from R4, post inc - sub %2, %2, #4 @ decrement count by 4 - cmp r2, r3 @ are the two words the same ? - bne 1f @ no = goto CHECK WORD CONTENTS -0: @ WORD CHECK LOOP - cmp %2, #0x3 @ is the count <= 3 ? - bls 1f @ yes = goto CHECK BYTES BY HAND - ldr r2, [lr], #4 @ load word from LR, post inc -" PRELOADSTR("lr") " @ preload - ldr r3, [r4], #4 @ load word from R4, post inc -" PRELOADSTR("r4") " @ preload - sub %2, %2, #4 @ decrement count by 4 - cmp r2, r3 @ are the two words the same ? - beq 0b @ yes = goto WORD CHECK LOOP -1: @ CHECK BYTES BY HAND - sub %0, lr, #0x4 @ move LR back a word and put into first pointer - sub %1, r4, #0x4 @ move R4 back a word and put into second pointer - add %2, %2, #4 @ increment the count by 4 - @ fall through into SLOW CHECK" -#endif /* !__OPTIMIZE_SIZE__ */ -" -6: @ SLOW CHECK - sub %2, %2, #1 @ Decrement the count by one - cmn %2, #0x1 @ Has the count reached -1 ? - beq 4f @ Yes - we are finished, goto PASS END -0: @ LOOP1 - ldrb r2, [%0], #1 @ get byte from first pointer -" PRELOADSTR("%0") " @ preload first pointer - ldrb r3, [%1], #1 @ get byte from second pointer -" PRELOADSTR("%1") " @ preload second pointer - cmp r2, r3 @ compare the two loaded bytes - bne 5f @ if they are not equal goto EXIT - sub %2, %2, #1 @ decremented count by 1 - cmn %2, #0x1 @ has the count reached -1 ? - bne 0b @ no = then go back to LOOP1 -4: @ PASS END - mov r3, r2 @ Default return value is 0 -5: @ EXIT - rsb %0, r3, r2 @ return difference between last two bytes loaded" - : "=r" (result), "=&r" (s2), "=&r" (len) - : "0" (s1), "1" (s2), "2" (len) - : "r2", "r3", "r4", "r5", "r6", "cc", "lr"); - return result; -} -#endif |