110 lines
1.5 KiB
C
110 lines
1.5 KiB
C
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#if defined __thumb__
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#include "../../string/memcmp.c"
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#else
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#include <string.h>
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#include "xscale.h"
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int
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memcmp (const void *s1, const void *s2, size_t len)
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{
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int result;
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asm (
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#ifndef __OPTIMIZE_SIZE__
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"
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cmp %2, #0x3
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bls 6f
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and r2, %0, #0x3
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and r3, %1, #0x3
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cmp r2, r3
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bne 6f
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mov lr, %0
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mov r4, %1
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cmp r2, #0x0
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beq 3f
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b 1f
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0:
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ldrb r2, [lr], #1 @ zero_extendqisi2
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" PRELOADSTR("lr") "
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ldrb r3, [r4], #1 @ zero_extendqisi2
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" PRELOADSTR("r4") "
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cmp r2, r3
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bne 5f
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tst lr, #0x3
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beq 3f
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1:
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sub %2, %2, #1
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cmn %2, #0x1
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bne 0b
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b 4f
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0:
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cmp %2, #0x7
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bls 3f
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ldmia lr,{r2, r3}
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ldmia r4,{r5, r6}
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sub %2, %2, #0x4
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cmp r2, r5
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bne 1f
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sub %2, %2, #0x4
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add lr, lr, #0x4
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add r4, r4, #0x4
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cmp r3, r6
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beq 0b
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1:
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add %2, %2, #0x4
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sub %0, lr, #0x4
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sub %1, r4, #0x4
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b 6f
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3:
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cmp %2, #0x3
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bls 1f
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ldr r2, [lr], #4
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ldr r3, [r4], #4
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sub %2, %2, #4
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cmp r2, r3
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bne 1f
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0:
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cmp %2, #0x3
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bls 1f
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ldr r2, [lr], #4
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" PRELOADSTR("lr") "
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ldr r3, [r4], #4
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" PRELOADSTR("r4") "
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sub %2, %2, #4
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cmp r2, r3
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beq 0b
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1:
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sub %0, lr, #0x4
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sub %1, r4, #0x4
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add %2, %2, #4
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"
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#endif /* !__OPTIMIZE_SIZE__ */
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"
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6:
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sub %2, %2, #1
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cmn %2, #0x1
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beq 4f
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0:
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ldrb r2, [%0], #1 @ zero_extendqisi2
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" PRELOADSTR("%0") "
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ldrb r3, [%1], #1 @ zero_extendqisi2
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" PRELOADSTR("%1") "
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cmp r2, r3
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bne 5f
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sub %2, %2, #1
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cmn %2, #0x1
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bne 0b
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4:
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mov r3, r2
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5:
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rsb %0, r3, r2"
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: "=r" (result), "=&r" (s2), "=&r" (len)
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: "0" (s1), "1" (s2), "2" (len)
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: "r2", "r3", "r4", "r5", "r6", "cc");
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return result;
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}
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#endif
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