44 lines
1.6 KiB
C++
44 lines
1.6 KiB
C++
//===-- Generic utilities for GPU timing ----------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_SRC_TIME_GPU_TIME_UTILS_H
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#define LLVM_LIBC_SRC_TIME_GPU_TIME_UTILS_H
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#include "hdr/time_macros.h"
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#include "hdr/types/clock_t.h"
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#include "src/__support/GPU/utils.h"
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#include "src/__support/macros/config.h"
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namespace LIBC_NAMESPACE_DECL {
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#if defined(LIBC_TARGET_ARCH_IS_AMDGPU)
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// AMDGPU does not have a single set frequency. Different architectures and
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// cards can have different values. The actualy frequency needs to be read from
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// the kernel driver and will be between 25 MHz and 100 MHz on most cards. All
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// cards following the GFX9 ISAs use a 100 MHz clock so we will default to that.
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constexpr uint64_t clock_freq = 100000000UL;
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// We provide an externally visible symbol such that the runtime can set
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// this to the correct value.
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extern "C" {
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[[gnu::visibility("protected")]]
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extern gpu::Constant<uint64_t> __llvm_libc_clock_freq;
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}
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#define GPU_CLOCKS_PER_SEC static_cast<clock_t>(__llvm_libc_clock_freq)
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#elif defined(LIBC_TARGET_ARCH_IS_NVPTX)
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// NPVTX uses a single 1 GHz fixed frequency clock for all target architectures.
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#define GPU_CLOCKS_PER_SEC static_cast<clock_t>(1000000000UL)
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#else
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#error "Unsupported target"
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#endif
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} // namespace LIBC_NAMESPACE_DECL
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#endif // LLVM_LIBC_SRC_TIME_GPU_TIME_UTILS_H
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