File simdlib_emulated.h

namespace faiss

Copyright (c) Facebook, Inc. and its affiliates.

This source code is licensed under the MIT license found in the LICENSE file in the root directory of this source tree.

Throughout the library, vectors are provided as float * pointers. Most algorithms can be optimized when several vectors are processed (added/searched) together in a batch. In this case, they are passed in as a matrix. When n vectors of size d are provided as float * x, component j of vector i is

x[ i * d + j ]

where 0 <= i < n and 0 <= j < d. In other words, matrices are always compact. When specifying the size of the matrix, we call it an n*d matrix, which implies a row-major storage.

Copyright (c) Facebook, Inc. and its affiliates.

This source code is licensed under the MIT license found in the LICENSE file in the root directory of this source tree. I/O functions can read/write to a filename, a file handle or to an object that abstracts the medium.

The read functions return objects that should be deallocated with delete. All references within these objectes are owned by the object.

Copyright (c) Facebook, Inc. and its affiliates.

This source code is licensed under the MIT license found in the LICENSE file in the root directory of this source tree. Definition of inverted lists + a few common classes that implement the interface.

Copyright (c) Facebook, Inc. and its affiliates.

This source code is licensed under the MIT license found in the LICENSE file in the root directory of this source tree. Since IVF (inverted file) indexes are of so much use for large-scale use cases, we group a few functions related to them in this small library. Most functions work both on IndexIVFs and IndexIVFs embedded within an IndexPreTransform.

Copyright (c) Facebook, Inc. and its affiliates.

This source code is licensed under the MIT license found in the LICENSE file in the root directory of this source tree. In this file are the implementations of extra metrics beyond L2 and inner product

Copyright (c) Facebook, Inc. and its affiliates.

This source code is licensed under the MIT license found in the LICENSE file in the root directory of this source tree. Defines a few objects that apply transformations to a set of vectors Often these are pre-processing steps.

Functions

inline simd16uint16 min(const simd16uint16 &av, const simd16uint16 &bv)
inline simd16uint16 max(const simd16uint16 &av, const simd16uint16 &bv)
inline simd16uint16 combine2x2(const simd16uint16 &a, const simd16uint16 &b)
inline uint32_t cmp_ge32(const simd16uint16 &d0, const simd16uint16 &d1, const simd16uint16 &thr)
inline uint32_t cmp_le32(const simd16uint16 &d0, const simd16uint16 &d1, const simd16uint16 &thr)
inline simd32uint8 uint16_to_uint8_saturate(const simd16uint16 &a, const simd16uint16 &b)
inline uint32_t get_MSBs(const simd32uint8 &a)

get most significant bit of each byte

inline simd32uint8 blendv(const simd32uint8 &a, const simd32uint8 &b, const simd32uint8 &mask)

use MSB of each byte of mask to select a byte between a and b

inline simd8float32 hadd(const simd8float32 &a, const simd8float32 &b)
inline simd8float32 unpacklo(const simd8float32 &a, const simd8float32 &b)
inline simd8float32 unpackhi(const simd8float32 &a, const simd8float32 &b)
inline simd8float32 fmadd(const simd8float32 &a, const simd8float32 &b, const simd8float32 &c)
struct simd16uint16 : public faiss::simd256bit
#include <simdlib_avx2.h>
struct simd256bit
#include <simdlib_avx2.h>
struct simd32uint8 : public faiss::simd256bit
struct simd8float32 : public faiss::simd256bit
struct simd8uint32 : public faiss::simd256bit
#include <simdlib_avx2.h>