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| 型号： | IPT-C2H-NIOS |
| 厂商： | Altera |
| 文件页数： | 91/138页 |
| 文件大小： | 0K |
| 描述： | C2H COMPILER FOR NIOS II |
| 标准包装： | 1 |
| 系列： | Nios®II |
| 类型： | Nios II |
| 功能： | C 到硬件编译器 |
| 许可证： | 初始许可证 |
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C-to-Hardware Mapping Reference
Resource
Sharing
The C2H Compiler is capable of sharing resources which consume
significant amounts of logic. A resource only becomes shared if it is
under-utilized. In other words, the C2H Compiler only shares a resource
if the performance of accelerator is not affected. Table 3–6 lists all of the
resources that can be shared automatically by the C2H Compiler.
Table 3–6. Sharable Resource
Dereference or
Operator
*var
var[]
*
/
%
<<
>>
Description
Memory Access
Multiply
Divide
Modulo
Left Shift
Right Shift
Required Conditions
- Multiple dereferences to access data from the same Avalon-MM
memory port
- Multiple dereferences occurring within the same level in the
algorithm (function or loop)
- Loop CPLI must not increase
- Promoted data width (32 or 64 bit) must be the same for all
multiplications. The promoted data width is shown in the C2H report.
- Multiplications occurring within the same level in the algorithm
(function or loop)
- Both operands must be either signed or unsigned.
- Loop CPLI must not increase
- Promoted data width (32 or 64 bit) must be the same for all divisions.
The promoted data width is shown in the C2H report.
- Divisions occurring within the same level in the algorithm (function
or loop)
- Both operands must be either signed or unsigned.
- Loop CPLI must not increase
- Promoted data width (32 or 64 bit) must be the same for all modulo
operations. The promoted data width is shown in the C2H report.
- Modulo operations occurring within the same level in the algorithm
(function or loop)
- Both operands must be either signed or unsigned.
- Loop CPLI must not increase
- Promoted data width (32 or 64 bit) must be the same for all left shift
operations. The promoted data width is shown in the C2H report.
- Left shift operations occurring within the same level in the algorithm
(function or loop)
- Both operands must be either signed or unsigned.
- Loop CPLI must not increase
- Promoted data width (32 or 64 bit) must be the same for all right shift
operations. The promoted data width is shown in the C2H report.
- Right shift operations occurring within the same level in the
algorithm (function or loop)
- Both operands must be either signed or unsigned.
- Loop CPLI must not increase
Altera Corporation
November 2009
9.1
3–51
Nios II C2H Compiler User Guide
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