Developer Guide and Reference

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Shuffle Intrinsics

These Supplemental Streaming SIMD Extensions 3 (SSSE3) intrinsics are used to perform shuffle operations. The prototypes for these intrinsics are in
tmmintrin.h
.
To use these intrinsics, include the
immintrin.h
file as follows:
#include <immintrin.h>

_mm_shuffle_epi8

extern __m128i _mm_shuffle_epi8(__m128i a, __m128i b);
Shuffle bytes from
a
according to contents of
b
.
Interpreting
a
,
b
, and
r
as arrays of unsigned 8-bit integers:
for (i = 0; i < 16; i++){  if (b[i] & 0x80){ r[i] = 0; } else { r[i] = a[b[i] & 0x0F]; } }

_mm_shuffle_pi8

extern __m64 _mm_shuffle_pi8(__m64 a, __m64 b);
Shuffle bytes from
a
according to contents of
b
.
Interpreting
a
,
b
, and
r
as arrays of unsigned 8-bit integers:
for (i = 0; i < 8; i++){  if (b[i] & 0x80){ r[i] = 0; } else { r[i] = a[b[i] & 0x07]; } }