50 lines
775 B
C
50 lines
775 B
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include "sys.h"
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static always_inline int cris_lz(int x)
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{
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int r;
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asm ("lz\t%1, %0\n" : "=r" (r) : "r" (x));
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return r;
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}
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void check_lz(void)
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{
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int i;
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if (cris_lz(0) != 32)
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err();
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if (cris_lz(1) != 31)
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err();
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if (cris_lz(2) != 30)
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err();
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if (cris_lz(4) != 29)
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err();
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if (cris_lz(8) != 28)
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err();
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/* try all positions with a single bit. */
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for (i = 1; i < 32; i++) {
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if (cris_lz(1 << (i-1)) != (32 - i))
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err();
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}
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/* try all positions with all bits. */
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for (i = 1; i < 32; i++) {
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/* split up this computation to clarify it. */
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uint32_t val;
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val = (unsigned int)-1 >> (32 - i);
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if (cris_lz(val) != (32 - i))
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err();
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}
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}
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int main(void)
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{
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check_lz();
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pass();
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exit(0);
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}
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