70 lines
1.6 KiB
Plaintext
70 lines
1.6 KiB
Plaintext
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/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the CC-by-NC license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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// Copyright 2004-present Facebook. All Rights Reserved.
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#pragma once
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#include "Float16.cuh"
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//
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// Templated wrappers to express load/store for different scalar and vector
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// types, so kernels can have the same written form but can operate
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// over half and float, and on vector types transparently
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//
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namespace faiss { namespace gpu {
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template <typename T>
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struct LoadStore {
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static inline __device__ T load(void* p) {
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return *((T*) p);
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}
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static inline __device__ void store(void* p, const T& v) {
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*((T*) p) = v;
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}
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};
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#ifdef FAISS_USE_FLOAT16
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template <>
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struct LoadStore<Half4> {
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static inline __device__ Half4 load(void* p) {
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Half4 out;
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asm("ld.global.v2.u32 {%0, %1}, [%2];" :
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"=r"(out.a.x), "=r"(out.b.x) : "l"(p));
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return out;
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}
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static inline __device__ void store(void* p, const Half4& v) {
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asm("st.v2.u32 [%0], {%1, %2};" : : "l"(p), "r"(v.a.x), "r"(v.b.x));
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}
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};
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template <>
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struct LoadStore<Half8> {
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static inline __device__ Half8 load(void* p) {
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Half8 out;
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asm("ld.global.v4.u32 {%0, %1, %2, %3}, [%4];" :
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"=r"(out.a.a.x), "=r"(out.a.b.x),
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"=r"(out.b.a.x), "=r"(out.b.b.x) : "l"(p));
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return out;
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}
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static inline __device__ void store(void* p, const Half8& v) {
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asm("st.v4.u32 [%0], {%1, %2, %3, %4};"
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: : "l"(p), "r"(v.a.a.x), "r"(v.a.b.x), "r"(v.b.a.x), "r"(v.b.b.x));
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}
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};
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#endif // FAISS_USE_FLOAT16
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} } // namespace
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