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Altera Corporation 9.1 7–9
November 2009 Nios II C2H Compiler User Guide
ANSI C Compliance and Restrictions
{
char *c1 = "??<";
return (c1!=c2);
}
Directives (Section 6.10)
The C2H Compiler does not support the directives listed in this section.
Error Directive (Section 6.10.5)
The error directive is not supported.
#error
Predefined Macro Names (Section 6.10.8)
All the predefined macros of Section 6.10.8 are not supported. These
predefined macros include:
__bool_true_false_are_defined
__cplusplus
__DATE__
__FILE__
__LINE__
__STDC_, 6.11.9
__STDC__
__STDC_CONSTANT_MACROS
__STDC_FORMAT_MACROS
__STDC_HOSTED__
__STDC_IEC_559_
__STDC_IEC_559_COMPLEX__
__STDC_ISO_10646__
__STDC_LIMIT_MACROS
__STDC_VERSION__
__TIME__
_Complex_I
_Imaginary_I
_IOFBF
_IOLBF
_IONBF
Other
Restrictions
The C2H Compiler does not support external subfunctions. You must
locate the subfunction in the same source file as the accelerated function.
This is because, unlike the #include construct, a C external function
reference requires the presence of a linker. The C2H Compiler has no
linker.
- 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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