# Dhrystone Benchmark :copyright: Original sources from [https://github.com/sifive/benchmark-dhrystone](https://github.com/sifive/benchmark-dhrystone) (also, see `LICENSE`). The source code has been modified for the NEORV32 processor. To compile the NEORV32 executable: ``` neorv32/sw/example/dhrystone$ sh dhrystone.sh ``` The default number of iterations is 2000000. You can modify this by changing `USER_FLAGS+=-DDHRY_ITERS=2000000` in `dhrystone.sh`. The default optimization level (EFFORT) is `O3`. :warning: Dhrystone will require an IMEM size of 16kB and a DMEM size of 16kB. The MTIME machine timer is used for timing evaluation. :construction: Porting Dhrystone is still work-in-progress. Performance results might be incorrect and not optimized. All results only show the integer parts. ### Exemplary Output Output generated for processor HW version [v1.5.9.1](https://github.com/stnolting/neorv32/blob/main/CHANGELOG.md) using performance-optimized configuration options. ``` NEORV32: Processor running at 100000000 Hz NEORV32: Executing Dhrystone (2000000 iterations). This may take some time... Dhrystone Benchmark, Version 2.1 (Language: C) Program compiled without 'register' attribute Execution starts, 2000000 runs through Dhrystone Execution ends Final values of the variables used in the benchmark: Int_Glob: 5 should be: 5 Bool_Glob: 1 should be: 1 Ch_1_Glob: A should be: A Ch_2_Glob: B should be: B Arr_1_Glob[8]: 7 should be: 7 Arr_2_Glob[8][7]: 2000010 should be: Number_Of_Runs + 10 Ptr_Glob-> Ptr_Comp: -2147467428 should be: (implementation-dependent) Discr: 0 should be: 0 Enum_Comp: 2 should be: 2 Int_Comp: 17 should be: 17 Str_Comp: DHRYSTONE PROGRAM, SOME STRING should be: DHRYSTONE PROGRAM, SOME STRING Next_Ptr_Glob-> Ptr_Comp: -2147467428 should be: (implementation-dependent), same as above Discr: 0 should be: 0 Enum_Comp: 1 should be: 1 Int_Comp: 18 should be: 18 Str_Comp: DHRYSTONE PROGRAM, SOME STRING should be: DHRYSTONE PROGRAM, SOME STRING Int_1_Loc: 5 should be: 5 Int_2_Loc: 13 should be: 13 Int_3_Loc: 7 should be: 7 Enum_Loc: 1 should be: 1 Str_1_Loc: DHRYSTONE PROGRAM, 1'ST STRING should be: DHRYSTONE PROGRAM, 1'ST STRING Str_2_Loc: DHRYSTONE PROGRAM, 2'ND STRING should be: DHRYSTONE PROGRAM, 2'ND STRING Microseconds for one run through Dhrystone: 13 Dhrystones per Second: 76923 NEORV32: << DETAILED RESULTS (integer parts only) >> NEORV32: Total cycles: 2662000187 NEORV32: Cycles per second: 100000000 NEORV32: Total runs: 2000000 NEORV32: DMIPS/s: 76923 NEORV32: DMIPS/MHz: 769 NEORV32: VAX DMIPS/s: 43 NEORV32: VAX DMIPS/MHz: 43/100 ```