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fixed log_2 for ARM arch

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eddyem
2015-02-09 08:34:17 +03:00
parent b53a659d40
commit c14be0eb90
6 changed files with 189 additions and 20 deletions
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8
B-trees.c
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@@ -56,12 +56,8 @@ void *my_alloc(size_t N, size_t S){
#endif
static inline uint32_t log_2(const uint32_t x) {
uint32_t y;
asm ( "\tbsr %1, %0\n"
: "=r"(y)
: "r" (x)
);
return y;
if(x == 0) return 0;
return (31 - __builtin_clz (x));
}
// later this function maybe mode difficult