### Build and Manage Dhrystone Benchmark

Source: https://context7.com/sifive/benchmark-dhrystone/llms.txt

Commands to compile the Dhrystone benchmark using a Makefile. Supports custom iteration counts and compiler optimizations.

```bash
make dhrystone
make dhrystone XCFLAGS="-DDHRY_ITERS=20000000"
make dhrystone XCFLAGS="-DREG=register"
make clean
```

--------------------------------

### Implement Proc_2 Integer Reference Parameter

Source: https://context7.com/sifive/benchmark-dhrystone/llms.txt

Proc_2 demonstrates integer arithmetic using reference parameters and do-while loops. It tests character comparison and variable modification.

```c
Proc_2(Int_Par_Ref)
One_Fifty *Int_Par_Ref;
{
  One_Fifty Int_Loc;
  Enumeration Enum_Loc;
  Int_Loc = *Int_Par_Ref + 10;
  do
    if (Ch_1_Glob == 'A') {
      Int_Loc -= 1;
      *Int_Par_Ref = Int_Loc - Int_Glob;
      Enum_Loc = Ident_1;
    }
  while (Enum_Loc != Ident_1);
}
```

--------------------------------

### Implement Proc_7 Integer Arithmetic

Source: https://context7.com/sifive/benchmark-dhrystone/llms.txt

Proc_7 performs simple integer addition using two value parameters and returns the result via a reference parameter.

```c
Proc_7(Int_1_Par_Val, Int_2_Par_Val, Int_Par_Ref)
One_Fifty Int_1_Par_Val;
One_Fifty Int_2_Par_Val;
One_Fifty *Int_Par_Ref;
{
  One_Fifty Int_Loc;
  Int_Loc = Int_1_Par_Val + 2;
  *Int_Par_Ref = Int_2_Par_Val + Int_Loc;
}
```

--------------------------------

### Perform String Comparison (Func_2)

Source: https://context7.com/sifive/benchmark-dhrystone/llms.txt

Executes string operations including character indexing and standard string comparison. It demonstrates complex control flow with nested conditional branches.

```c
Boolean Func_2(Str_30 Str_1_Par_Ref, Str_30 Str_2_Par_Ref) {
  REG One_Thirty Int_Loc = 2;
  Capital_Letter Ch_Loc;
  while (Int_Loc <= 2) {
    if (Func_1(Str_1_Par_Ref[Int_Loc], Str_2_Par_Ref[Int_Loc+1]) == Ident_1) {
      Ch_Loc = 'A';
      Int_Loc += 1;
    }
  }
  if (Ch_Loc >= 'W' && Ch_Loc < 'Z') Int_Loc = 7;
  if (Ch_Loc == 'R') return (true);
  else {
    if (strcmp(Str_1_Par_Ref, Str_2_Par_Ref) > 0) return (true);
    else return (false);
  }
}
```

--------------------------------

### Configure Compilation Defines

Source: https://context7.com/sifive/benchmark-dhrystone/llms.txt

Preprocessor macros used to control register usage, timing methods, and compiler compatibility features during the build process.

```c
#define REG register
#define TIMES
#define TIME
#define HZ 60
#define NOSTRUCTASSIGN
#define NOENUM
#define DHRY_ITERS 20000000
```

--------------------------------

### Perform Character Comparison (Func_1)

Source: https://context7.com/sifive/benchmark-dhrystone/llms.txt

Tests character variable assignment and equality comparison. It returns an enumeration value indicating whether the two input characters are identical.

```c
Enumeration Func_1(Capital_Letter Ch_1_Par_Val, Capital_Letter Ch_2_Par_Val) {
  Capital_Letter Ch_1_Loc = Ch_1_Par_Val;
  Capital_Letter Ch_2_Loc = Ch_1_Loc;
  if (Ch_2_Loc != Ch_2_Par_Val) return (Ident_1);
  else {
    Ch_1_Glob = Ch_1_Loc;
    return (Ident_2);
  }
}
```

--------------------------------

### Perform Array Manipulation (Proc_8)

Source: https://context7.com/sifive/benchmark-dhrystone/llms.txt

Demonstrates one-dimensional and two-dimensional array access patterns. It performs indexed assignments and modifies global variables to test memory access efficiency.

```c
void Proc_8(Arr_1_Dim Arr_1_Par_Ref, Arr_2_Dim Arr_2_Par_Ref, int Int_1_Par_Val, int Int_2_Par_Val) {
  REG One_Fifty Int_Index;
  REG One_Fifty Int_Loc;
  Int_Loc = Int_1_Par_Val + 5;
  Arr_1_Par_Ref[Int_Loc] = Int_2_Par_Val;
  Arr_1_Par_Ref[Int_Loc+1] = Arr_1_Par_Ref[Int_Loc];
  Arr_1_Par_Ref[Int_Loc+30] = Int_Loc;
  for (Int_Index = Int_Loc; Int_Index <= Int_Loc+1; ++Int_Index)
    Arr_2_Par_Ref[Int_Loc][Int_Index] = Int_Loc;
  Arr_2_Par_Ref[Int_Loc][Int_Loc-1] += 1;
  Arr_2_Par_Ref[Int_Loc+20][Int_Loc] = Arr_1_Par_Ref[Int_Loc];
  Int_Glob = 5;
}
```

--------------------------------

### Implement Proc_1 Record Component Assignment

Source: https://context7.com/sifive/benchmark-dhrystone/llms.txt

Proc_1 performs pointer traversal and record component assignments to test structure manipulation. It modifies linked records and invokes other benchmark procedures.

```c
Proc_1(Ptr_Val_Par)
REG Rec_Pointer Ptr_Val_Par;
{
  REG Rec_Pointer Next_Record = Ptr_Val_Par->Ptr_Comp;
  structassign(*Ptr_Val_Par->Ptr_Comp, *Ptr_Glob);
  Ptr_Val_Par->variant.var_1.Int_Comp = 5;
  Next_Record->variant.var_1.Int_Comp = Ptr_Val_Par->variant.var_1.Int_Comp;
  Next_Record->Ptr_Comp = Ptr_Val_Par->Ptr_Comp;
  Proc_3(&Next_Record->Ptr_Comp);
  if (Next_Record->Discr == Ident_1) {
    Next_Record->variant.var_1.Int_Comp = 6;
    Proc_6(Ptr_Val_Par->variant.var_1.Enum_Comp, &Next_Record->variant.var_1.Enum_Comp);
    Next_Record->Ptr_Comp = Ptr_Glob->Ptr_Comp;
    Proc_7(Next_Record->variant.var_1.Int_Comp, 10, &Next_Record->variant.var_1.Int_Comp);
  }
}
```

--------------------------------

### C Data Type and Structure Definitions for Dhrystone Benchmark

Source: https://context7.com/sifive/benchmark-dhrystone/llms.txt

Defines custom integer, character, boolean, string, array, enumeration, and record types used in the Dhrystone benchmark. These are crucial for testing diverse operand types and complex data structures. The code includes global variable initialization for these structures.

```c
/* Type definitions from dhry.h */

typedef int     One_Thirty;       /* Integer range 1-30 */
typedef int     One_Fifty;        /* Integer range 1-50 */
typedef char    Capital_Letter;   /* Character A-Z */
typedef int     Boolean;          /* 0 or 1 */
typedef char    Str_30[31];       /* 30-character string + null */
typedef int     Arr_1_Dim[50];    /* 1D integer array */
typedef int     Arr_2_Dim[50][50]; /* 2D integer array */

/* Enumeration type (or integer defines if NOENUM) */
typedef enum {Ident_1, Ident_2, Ident_3, Ident_4, Ident_5} Enumeration;

/* Record structure with variant (union) component */
typedef struct record {
  struct record *Ptr_Comp;     /* Pointer to next record */
  Enumeration    Discr;        /* Discriminant field */
  union {
    struct { 
      Enumeration Enum_Comp;
      int         Int_Comp;
      char        Str_Comp[31];
    } var_1;
    struct {
      Enumeration E_Comp_2;
      char        Str_2_Comp[31];
    } var_2;
    struct {
      char        Ch_1_Comp;
      char        Ch_2_Comp;
    } var_3;
  } variant;
} Rec_Type, *Rec_Pointer;

/* Global variable initialization in main() */
Next_Ptr_Glob = (Rec_Pointer) malloc(sizeof(Rec_Type));
Ptr_Glob = (Rec_Pointer) malloc(sizeof(Rec_Type));
Ptr_Glob->Ptr_Comp = Next_Ptr_Glob;
Ptr_Glob->Discr = Ident_1;
Ptr_Glob->variant.var_1.Enum_Comp = Ident_3;
Ptr_Glob->variant.var_1.Int_Comp = 40;
strcpy(Ptr_Glob->variant.var_1.Str_Comp, "DHRYSTONE PROGRAM, SOME STRING");
```

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