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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/bits/morton.h Normal file
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#ifndef COSMOPOLITAN_LIBC_BITS_MORTON_H_
#define COSMOPOLITAN_LIBC_BITS_MORTON_H_
#include "libc/intrin/pdep.h"
#include "libc/intrin/pext.h"
#include "libc/nexgen32e/x86feature.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
unsigned long morton(unsigned long, unsigned long) libcesque pureconst;
axdx_t unmorton(unsigned long) libcesque pureconst;
#ifndef __STRICT_ANSI__
#define morton(Y, X) \
(X86_NEED(BMI2) \
? pdep(X, 0x5555555555555555ul) | pdep(Y, 0xAAAAAAAAAAAAAAAAul) \
: morton(Y, X))
#define unmorton(I) \
(X86_NEED(BMI2) ? (axdx_t){pext(I, 0xAAAAAAAAAAAAAAAAul), \
pext(I, 0x5555555555555555ul)} \
: unmorton(I))
#endif
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_BITS_MORTON_H_ */