81 lines
1.0 KiB
C
81 lines
1.0 KiB
C
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#if defined __thumb__
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#include "../../string/memset.c"
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#else
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#include <string.h>
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#include "xscale.h"
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void *
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memset (void *dst, int c, size_t len)
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{
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int dummy;
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asm volatile ("tst %0, #0x3"
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#ifndef __OPTIMIZE_SIZE__
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"
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beq 1f
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b 2f
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0:
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strb %1, [%0], #1
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tst %0, #0x3
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beq 1f
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2:
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movs r3, %2
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sub %2, %2, #1
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bne 0b
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1:
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cmp %2, #0x3
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bls 2f
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and %1, %1, #0xff
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orr lr, %1, %1, asl #8
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cmp %2, #0xf
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orr lr, lr, lr, asl #16
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bls 1f
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mov r3, lr
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mov r4, lr
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mov r5, lr
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0:
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sub %2, %2, #16
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stmia %0!, { r3, r4, r5, lr }
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cmp %2, #0xf
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bhi 0b
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1:
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cmp %2, #0x7
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bls 1f
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mov r3, lr
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0:
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sub %2, %2, #8
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stmia %0!, { r3, lr }
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cmp %2, #0x7
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bhi 0b
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1:
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cmp %2, #0x3
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bls 2f
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0:
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sub %2, %2, #4
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str lr, [%0], #4
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cmp %2, #0x3
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bhi 0b
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"
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#endif /* !__OPTIMIZE_SIZE__ */
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"
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2:
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movs r3, %2
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sub %2, %2, #1
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beq 1f
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0:
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movs r3, %2
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sub %2, %2, #1
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strb %1, [%0], #1
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bne 0b
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1:"
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: "=&r" (dummy), "=&r" (c), "=&r" (len)
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: "0" (dst), "1" (c), "2" (len)
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: "memory", "r3", "r4", "r5", "lr");
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return dst;
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}
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#endif
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