Developer Guide and Reference

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Concatenate Intrinsics

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

_mm_alignr_epi8

extern __m128i _mm_alignr_epi8(__m128i a, __m128i b, int n);
Concatenates
a
and
b
, extracts byte-aligned result shifted to the right by
n
.
Interpreting
t1
as 256-bit unsigned integer,
a
,
b
, and
r
as 128-bit unsigned integers:
t1[255:128] = a; t1[127:0] = b; t1[255:0] = t1[255:0] >> (8 * n); // unsigned shift r[127:0] = t1[127:0];

_mm_alignr_pi8

extern __m64 _mm_alignr_pi8(__m64 a, __m64 b, int n);
Concatenates
a
and
b
, extracts byte-aligned result shifted to the right by
n
.
Interpreting
t1
as 128-bit unsigned integer,
a
,
b
, and
r
as 64-bit unsigned integers:
t1[127:64] = a; t1[63:0] = b; t1[127:0] = t1[127:0] >> (8 * n); // unsigned shift r[63:0] = t1[63:0];