Developer Guide and Reference

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_mm256_permutevar_pd, _mm_permutevar_pd

Permutes float64 values into a 256-bit or 128-bit destination vector. The corresponding Intel® AVX instruction is
VPERMILPD
.

Syntax

extern __m256d _mm256_permutevar_pd(__m256d m1, __m256i control);
extern __m128d _mm_permutevar_pd(__m128d m1, __m128i control);
Arguments
m1
a 256-bit or 128-bit float64 vector
control
a vector with 1-bit control fields, one for each corresponding element of the source vector
  • for the 256-bit
    m1
    source vector this
    control
    vector contains four 1-bit control fields in the low 4 bits of the immediate
  • for the 128-bit
    m1
    source vector this
    control
    vector contains two 1-bit control fields in the low 2 bits of the immediate
Description
Permutes double-precision floating-point values in the source vector,
m1
, according to the the 1-bit control fields in the low bytes of corresponding elements of a shuffle control. The result is stored in a destination vector.
Returns
A 256-bit or 128-bit float64 vector with permuted values.