Drazen Urch
7bd1550195
* Checkpoint * cpu cycle ffi * Rename * mixnode feature * Bundle libcpucycles
30 lines
549 B
C
30 lines
549 B
C
// version 20230105
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// public domain
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// djb
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// adapted from supercop/cpucycles/riscv.c
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// which has code from djb and Romain Dolbeau
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#include "cpucycles_internal.h"
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#ifndef __riscv_xlen
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#error this code is only for riscv platforms
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#endif
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#if __riscv_xlen != 64
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#error this code is only for riscv64 platforms
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#endif
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long long ticks(void)
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{
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long long result;
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asm volatile("rdcycle %0" : "=r" (result));
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return result;
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}
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long long ticks_setup(void)
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{
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if (!cpucycles_works(ticks)) return cpucycles_SKIP;
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return cpucycles_CYCLECOUNTER;
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}
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