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1015 B
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17 lines
1015 B
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# Constantine
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# Copyright (c) 2018-2019 Status Research & Development GmbH
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# Copyright (c) 2020-Present Mamy André-Ratsimbazafy
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at http://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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# TODO cycle counting on ARM
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#
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# - see writeup: http://zhiyisun.github.io/2016/03/02/How-to-Use-Performance-Monitor-Unit-(PMU)-of-64-bit-ARMv8-A-in-Linux.html
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#
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# Otherwise Google or FFTW approach might work but might require perf_counter privilege (`kernel.perf_event_paranoid=0` ?)
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# - https://github.com/google/benchmark/blob/0ab2c290/src/cycleclock.h#L127-L151
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# - https://github.com/FFTW/fftw3/blob/ef15637f/kernel/cycle.h#L518-L564
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# - https://github.com/vesperix/FFTW-for-ARMv7/blob/22ec5c0b/kernel/cycle.h#L404-L457
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