#ifndef COSMOPOLITAN_LIBC_NEXGEN32E_BSR_H_
#define COSMOPOLITAN_LIBC_NEXGEN32E_BSR_H_
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_

/*
 * BIT SCANNING 101
 *                          ctz(𝑥)         31^clz(𝑥)   clz(𝑥)
 *      uint32 𝑥   bsf(𝑥) tzcnt(𝑥)   ffs(𝑥)   bsr(𝑥) lzcnt(𝑥)
 *    0x00000000      wut       32        0      wut       32
 *    0x00000001        0        0        1        0       31
 *    0x80000001        0        0        1       31        0
 *    0x80000000       31       31       32       31        0
 *    0x00000010        4        4        5        4       27
 *    0x08000010        4        4        5       27        4
 *    0x08000000       27       27       28       27        4
 *    0xffffffff        0        0        1       31        0
 */

int bsr(int);
int bsrl(long);
int bsrll(long long);
int bsrmax(uintmax_t);

#define bsr(u)   ((sizeof(int) * 8 - 1) ^ __builtin_clz(u))
#define bsrl(u)  ((sizeof(long) * 8 - 1) ^ __builtin_clzl(u))
#define bsrll(u) ((sizeof(long long) * 8 - 1) ^ __builtin_clzll(u))

COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_NEXGEN32E_BSR_H_ */