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