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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/intrin/palignr.h Normal file
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#ifndef COSMOPOLITAN_LIBC_INTRIN_PALIGNR_H_
#define COSMOPOLITAN_LIBC_INTRIN_PALIGNR_H_
#include "libc/assert.h"
#include "libc/intrin/macros.h"
#include "libc/macros.h"
#include "libc/str/str.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
void pvalignr(void *, const void *, const void *, size_t);
/**
* Overlaps vectors.
*
* 𝑖= 0 means 𝑐←𝑎
* 0<𝑖<16 means 𝑐←𝑎║𝑏
* 𝑖=16 means 𝑐←𝑏
* 16<𝑖<32 means 𝑐←𝑏║0
* 𝑖≥32 means 𝑐←0
*
* @param 𝑖 needs to be a literal, constexpr, or embedding
* @see pvalignr()
* @mayalias
*/
static void palignr(void *c, const void *b, const void *a, size_t i) {
char t[48];
memcpy(t, a, 16);
memcpy(t + 16, b, 16);
memset(t + 32, 0, 16);
memcpy(c, t + MIN(32, i), 16);
}
#ifndef __STRICT_ANSI__
#define palignr(C, B, A, I) \
do { \
if (!IsModeDbg() && X86_NEED(SSE) && X86_HAVE(SSSE3)) { \
__intrin_xmm_t *Xmm0 = (void *)(C); \
const __intrin_xmm_t *Xmm1 = (const __intrin_xmm_t *)(B); \
const __intrin_xmm_t *Xmm2 = (const __intrin_xmm_t *)(A); \
if (!X86_NEED(AVX)) { \
asm("palignr\t%2,%1,%0" \
: "=x"(*Xmm0) \
: "x"(*Xmm2), "i"(I), "0"(*Xmm1)); \
} else { \
asm("vpalignr\t%3,%2,%1,%0" \
: "=x"(*Xmm0) \
: "x"(*Xmm1), "x"(*Xmm2), "i"(I)); \
} \
} else { \
palignr(C, B, A, I); \
} \
} while (0)
#endif
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_INTRIN_PALIGNR_H_ */