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## root / tests / tcg / cris / check_lz.c @ c09015dd

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