Developer Guide and Reference

Contents

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]; } }

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804