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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/intrin/packuswb.h Normal file
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#ifndef COSMOPOLITAN_LIBC_INTRIN_PACKUSWB_H_
#define COSMOPOLITAN_LIBC_INTRIN_PACKUSWB_H_
#include "libc/intrin/macros.h"
#include "libc/macros.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
/**
* Casts shorts to unsigned chars w/ saturation.
*
* 𝑎 ← {CLAMP[𝑏ᵢ]|𝑖∈[0,4)} ║ {CLAMP[𝑐ᵢ]|𝑖∈[4,8)}
*
* @see packsswb()
* @mayalias
*/
static void packuswb(unsigned char a[16], const short b[8], const short c[8]) {
int i;
for (i = 0; i < 8; ++i) {
a[i] = MIN(255, MAX(0, b[i]));
}
for (i = 0; i < 8; ++i) {
a[i + 8] = MIN(255, MAX(0, c[i]));
}
}
#define packuswb(A, B, C) \
INTRIN_SSEVEX_X_X_X_(packuswb, SSE2, "packuswb", INTRIN_NONCOMMUTATIVE, A, \
B, C)
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_INTRIN_PACKUSWB_H_ */