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