Visible to Intel only — GUID: GUID-DB192BEA-1FB9-421A-ABB9-FA81417287B7
Visible to Intel only — GUID: GUID-DB192BEA-1FB9-421A-ABB9-FA81417287B7
<span class='option'>_mm_i64gather_epi64,_mm256_i64gather_epi64</span>
Gathers 2/4 quadword values from memory referenced by the given base address, qword indices, and scale. The corresponding Intel® AVX2 instruction is VPGATHERQQ.
extern __m128i _mm_i64gather_epi64(__int64 const * base, __m128i vindex, const int scale); |
extern __m256i _mm256_i64gather_epi64(__int64 const * base, __m256i vindex, const int scale); |
base |
the base address used to reference the loaded qword elements. |
vindex |
the vector of qword indices used to reference the loaded qword elements. |
scale |
The compilation time literal constant, which is used as the vector indices scale to address the loaded elements. Possible values are one of the following: 1, 2, 4, 8. |
The intrinsics load 2/4 quadword values from memory using the base address, qword indices, and 64-bit scale.
Below is the pseudo-code for the intrinsics:
_mm_i64gather_epi64():
result[63:0] = mem[base+vindex[63:0]*scale]; result[127:64] = mem[base+vindex[127:64]*scale];
_mm256_i64gather_epi64():
result[63:0] = mem[base+vindex[63:0]*scale]; result[127:64] = mem[base+vindex[127:64]*scale]; result[191:128] = mem[base+vindex[191:128]*scale]; result[255:192] = mem[base+vindex[255:192]*scale];
A 128/256-bit vector with unconditionally gathered integer64 values.