_mm256_shldi_epi64
Classification
AVX-512, Shift, CPUID Test: AVX512_VBMI2
Header File
immintrin.h
Instruction
VPSHLDQ ymm, ymm, ymm, imm8
Synopsis
 _mm256_shldi_epi64(__m256i a, __m256i b, int imm8);
Description
Concatenate packed 64-bit integers in "a" and "b" producing an intermediate 128-bit result. Shift the result left by "imm8" bits, and store the upper 64-bits in "dst").
Operation
FOR j := 0 to 3
	i := j*64
	tmp[127:0] := ((a[i+63:i] << 64)[127:0] | b[i+63:i]) << imm8[5:0]
	dst[i+63:i] := tmp[127:64]
ENDFOR
dst[MAX:256] := 0