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3–18 9.1 Altera Corporation
Nios II C2H Compiler User Guide November 2009
Memory Accesses
Example 3–10 shows two dereferences that are identical inside of a loop.
The C2H Compiler consolidates them into a single master port.
Example 3–10. Equivalent Pointers in a Loop
void equivalent_pointers(char *packed_data, int len)
{
int i = 0;
while (i < len)
{
char ms_nibble = *(packed_data) >> 4;
char ls_nibble = *(packed_data++) & 0x0f;
...
i++;
}
}
Example 3–11 demonstrates a case of non equivalent pointers.
Example 3–11 is similar to Example 3–10, but packed_data increments
between the two pointer dereferences. In this case the address
expressions have different values, which translate to two separate master
ports.
Example 3–11. Nonequivalent Pointers
void nonequivalent_pointers(char *packed_data, int len)
{
int i = 0;
while (i < len)
{
char ms_nibble = *(packed_data++) >> 4;
char ls_nibble = *(packed_data) & 0x0f;
...
i++;
}
}
- Nios II C2H Compiler 1
- User Guide 1
- UG-N2C2HCMPLR-1.6 2
- Contents 3
- Chapter 6. Pragma Reference 4
- 1. Introduction to the 7
- Target Audience 8
- Introduction 8
- Altera Corporation 9.1 1–5 11
- C2H Compiler 12
- Concepts 12
- Hardware and Software 13
- 1–8 9.1 Altera Corporation 14
- C2H Compiler Concepts 14
- System Architecture 15
- Appropriate for 19
- Hardware 19
- Acceleration 19
- Poor Acceleration Candidates 20
- Next Steps 22
- 2. Getting Started Tutorial 23
- Typical Design 24
- OpenCore Plus Evaluation 25
- Tutorial 26
- Altera Corporation 9.1 2–5 27
- Getting Started Tutorial 27
- Create the Software Project 28
- Altera Corporation 9.1 2–7 29
- 2–8 9.1 Altera Corporation 30
- Altera Corporation 9.1 2–9 31
- Rebuild the Project 32
- Remove the Accelerator 37
- 3. C-to-Hardware Mapping 41
- Reference 41
- Assignments 42
- >> 44
- << 44
- Iteration Statements 45
- Selection Statements 46
- Altera Corporation 9.1 3–7 47
- Conditional Operator ?: 48
- Altera Corporation 9.1 3–9 49
- Subfunction Calls 51
- Variable 53
- Declarations 53
- Scalar Variables 54
- Accesses 55
- Memory Accesses 58
- Volatile Type Qualifier 59
- Address Computation 61
- Data Computation 62
- Master-Slave Connections 63
- Array Subscript Operator 66
- Structure and Union Operators 68
- Scheduling 70
- Data Dependencies 71
- Pointer Aliasing 72
- int offset_b) 75
- my_ptr[offset_a] = a + 7; 75
- my_ptrb[offset_b] = b + 8; 75
- Read Operations with Latency 77
- Stalling 79
- Loop Pipelining 82
- Loop-Carried Dependencies 84
- Subfunction Pipelining 89
- Resource 91
- Resource Sharing 92
- 4. Understanding the C2H 95
- Configuration Meaning 96
- Altera Corporation 9.1 4–5 99
- 4–6 9.1 Altera Corporation 100
- Resources 100
- Altera Corporation 9.1 4–7 101
- Understanding the C2H View 101
- 4–8 9.1 Altera Corporation 102
- Altera Corporation 9.1 4–9 103
- Performance 104
- Loop Latency 105
- Scheduling Information 108
- Further Reading 113
- 5. Accelerating Code Using 115
- Tools Command Line 115
- Altera Corporation 9.1 5–3 117
- 5–4 9.1 Altera Corporation 118
- C2H Performance Metrics 118
- 6. Pragma Reference 119
- Reducing Arbitration Logic 120
- Flow Control 121
- Interrupt 122
- Unshare Pointer 123
- 6–6 9.1 Altera Corporation 124
- Unshare Pointer Pragma 124
- 7. ANSI C Compliance and 125
- Restrictions 125
- 7–2 9.1 Altera Corporation 126
- Language 126
- Expressions 127
- Functions 128
- Altera Corporation 9.1 7–5 129
- 7–6 9.1 Altera Corporation 130
- Altera Corporation 9.1 7–7 131
- Goto (Section 6.8.6.1) 132
- Other Restrictions 134
- Additional Information 135
- Revision History 136
- How to Contact 137
- Typographic 137
- Conventions 137
- Visual Cue Meaning 138
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