2b095c97fa
* Compile regular host code with SSE4.2 * Remove the SSE2 kernel, only the SSE4.2 and AVX2 kernel remain Pull Request: https://projects.blender.org/blender/blender/pulls/118471
83 lines
2.2 KiB
C++
83 lines
2.2 KiB
C++
/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
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*
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* SPDX-License-Identifier: Apache-2.0 */
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#pragma once
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#include "util/debug.h"
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#include "util/system.h"
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CCL_NAMESPACE_BEGIN
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/* A wrapper around per-microarchitecture variant of a kernel function.
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*
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* Provides a function-call-like API which gets routed to the most suitable implementation.
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*
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* For example, on a computer which only has SSE4.2 the kernel_sse42 will be used. */
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template<typename FunctionType> class CPUKernelFunction {
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public:
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CPUKernelFunction(FunctionType kernel_default,
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FunctionType kernel_sse42,
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FunctionType kernel_avx2)
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{
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kernel_info_ = get_best_kernel_info(kernel_default, kernel_sse42, kernel_avx2);
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}
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template<typename... Args> inline auto operator()(Args... args) const
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{
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assert(kernel_info_.kernel);
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return kernel_info_.kernel(args...);
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}
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const char *get_uarch_name() const
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{
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return kernel_info_.uarch_name;
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}
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protected:
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/* Helper class which allows to pass human-readable microarchitecture name together with function
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* pointer. */
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class KernelInfo {
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public:
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KernelInfo() : KernelInfo("", nullptr) {}
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/* TODO(sergey): Use string view, to have higher-level functionality (i.e. comparison) without
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* memory allocation. */
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KernelInfo(const char *uarch_name, FunctionType kernel)
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: uarch_name(uarch_name), kernel(kernel)
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{
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}
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const char *uarch_name;
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FunctionType kernel;
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};
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KernelInfo get_best_kernel_info(FunctionType kernel_default,
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FunctionType kernel_sse42,
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FunctionType kernel_avx2)
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{
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/* Silence warnings about unused variables when compiling without some architectures. */
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(void)kernel_sse42;
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(void)kernel_avx2;
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#ifdef WITH_CYCLES_OPTIMIZED_KERNEL_AVX2
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if (DebugFlags().cpu.has_avx2() && system_cpu_support_avx2()) {
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return KernelInfo("AVX2", kernel_avx2);
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}
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#endif
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#ifdef WITH_CYCLES_OPTIMIZED_KERNEL_SSE42
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if (DebugFlags().cpu.has_sse42() && system_cpu_support_sse42()) {
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return KernelInfo("SSE4.2", kernel_sse42);
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}
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#endif
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return KernelInfo("default", kernel_default);
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}
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KernelInfo kernel_info_;
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};
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CCL_NAMESPACE_END
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