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bdk: utils: add approx. square root calc for u64

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CTCaer 2022-05-08 05:27:05 +03:00
parent ebf0db77ee
commit ebe7b5a603
2 changed files with 29 additions and 0 deletions
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28
bdk/utils/util.c
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@ -75,6 +75,34 @@ char *strcpy_ns(char *dst, char *src)
return dst;
}
// Approximate square root finder for a 64-bit number.
u64 sqrt64(u64 num)
{
u64 base = 0;
u64 limit = num;
u64 square_root = 0;
while (base <= limit)
{
u64 tmp_sqrt = (base + limit) / 2;
if (tmp_sqrt * tmp_sqrt == num) {
square_root = tmp_sqrt;
break;
}
if (tmp_sqrt * tmp_sqrt < num)
{
square_root = base;
base = tmp_sqrt + 1;
}
else
limit = tmp_sqrt - 1;
}
return square_root;
}
u32 get_tmr_s()
{
return RTC(APBDEV_RTC_SECONDS);

1
bdk/utils/util.h
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@ -84,6 +84,7 @@ typedef struct _nyx_storage_t
u8 bit_count(u32 val);
u32 bit_count_mask(u8 bits);
char *strcpy_ns(char *dst, char *src);
u64 sqrt64(u64 num);
void exec_cfg(u32 *base, const cfg_op_t *ops, u32 num_ops);
u32 crc32_calc(u32 crc, const u8 *buf, u32 len);