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+# 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/master/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
+```