# _mm_mask_i32gather_ps, _mm256_mask_i32gather_ps

Gathers 2/4 packed single-precision floating point values from memory referenced by the given base address, dword indices and scale, and using the given single-precision FP mask values. The corresponding Intel® AVX2 instruction is `VGATHERDPS`.

## Syntax

extern __m128 _mm_mask_i32gather_ps(__m128 def_vals, float const * base, __m128i vindex __m128 vmask, const int scale);

extern __m256 _mm256_mask_i32gather_ps(__m256 def_vals, float const * base, __m256i vindex __m256 vmask, const int scale);

## Arguments

def_vals | the vector of single-precision FP values copied to the destination when the corresponding element of the single-precision FP mask is '0'.
base | the base address used to reference the loaded FP elements.
vindex | the vector of dword indices used to reference the loaded FP elements.
vmask | the vector of FP elements used as a vector mask; only the most significant bit of each data element is used as a mask.
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.

## Description

The intrinsics conditionally load 2/4 packed single-precision floating-point values from memory using dword indices according to mask values.

Below is the pseudo-code for the intrinsics:

`_mm_mask_i32gather_ps()`:

    result[31:0] = (vmask[31]==1) ? (mem[base+vindex[31:0]*scale]) : (def_vals[31:0]);
    result[63:32] = (vmask[63]==1) ? (mem[base+vindex[63:32]*scale]) : (def_vals[63:32]);
    result[95:64] = (vmask[95]==1) ? (mem[base+vindex[95:64]*scale]) : (def_vals[95:64]);
    result127:96] = (vmask[127]==1) ? (mem[base+vindex[127:96]*scale]) : (def_vals[127:96]);

`_mm256_mask_i32gather_ps()`:

    result[31:0] = (vmask[31]==1) ? (mem[base+vindex[31:0]*scale]) : (def_vals[31:0]);
    result[63:32] = (vmask[63]==1) ? (mem[base+vindex[63:32]*scale]) : (def_vals[63:32]);
    result[95:64] = (vmask[95]==1) ? (mem[base+vindex[95:64]*scale]) : (def_vals[95:64]);
    result127:96] = (vmask[127]==1) ? (mem[base+vindex[127:96]*scale]) : (def_vals[127:96]);
    result[159:128] = (vmask[159]==1) ? (mem[base+vindex[159:128]*scale]) : (def_vals[159:128]);
    result[191:160] = (vmask[191]==1) ? (mem[base+vindex[191:160]*scale]) : (def_vals[191:160]);
    result[223:192] = (vmask[223]==1) ? (mem[base+vindex[223:192]*scale]) : (def_vals[223:192]);
    result[255:224] = (vmask[255]==1) ? (mem[base+vindex[255:224]*scale]) : (def_vals[255:224]);

## Returns

A 128/256-bit vector with conditionally gathered single-precision FP values.

Parent topic: Intrinsics for GATHER Operations