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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/alg/bisectcarleft.h Normal file
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#ifndef COSMOPOLITAN_LIBC_ALG_BISECTCARLEFT_H_
#define COSMOPOLITAN_LIBC_ALG_BISECTCARLEFT_H_
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
/**
* Floor binary search of low 32-bits of 64-bit array items.
*
* This is well-suited to NexGen-32e, requiring less than 32 bytes of
* code. It's particularly useful for frozen maps, requiring less effort
* and memory than a perfect hash table.
*/
forceinline int32_t bisectcarleft(const int32_t (*cons)[2], size_t count,
const int32_t key) {
size_t left = 0;
size_t right = count;
while (left < right) {
size_t m = (left + right) >> 1;
if (cons[m][0] < key) {
left = m + 1;
} else {
right = m;
}
}
if (left && (left == count || cons[left][0] > key)) left--;
return left;
}
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_ALG_BISECTCARLEFT_H_ */