参数资料
型号: IPT-C2H-NIOS
厂商: Altera
文件页数: 108/138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
Performance
soon as the previous execution is complete. Not surprisingly, the critical
path statement is what limits the speed of the loop, and hence what
determines CPLI.
Figure 4–6. CRC Critical Path Scheduling by Assignment
Loop
Time ?
Iteration
0
2
4
6
8
10
12
14
16
18
20
22
24
13: lut_addr=((crc&0xFF)^
*data++;
0
State(0 ? 6)
14: crc=((crc>>8)^
table[lut_addr];
State(6 ? 11)
13: lut_addr=((crc&0xFF)^
*data++;
1
State(0 ? 6)
14: crc=((crc>>8)^
table[lut_addr];
State(6 ? 11)
13: lut_addr=((crc&0xFF)^
*data++;
2
State(0 ? 6)
14: crc=((crc>>8)^
table[lut_addr];
State(6 ? 11)
13: lut_addr=((crc&0xFF)^
*data++;
State(0 ? 6)
Notice, also, that line 13 ( lut_addr = (crc & 0xFF) ^ *data++ )
appears to take more clock cycles than line 14 ( crc = (crc >> 8) ^
table[lut_addr] ). The C2H Compiler “stretches out” the calculation
of lut_addr so that it is available exactly when it is needed. The memory
access in line 14 is nonetheless the limiting operation.
Scheduling Information
There are two ways of presenting the loop scheduling information: per
assignment, and per state.
4–14
Nios II C2H Compiler User Guide
9.1
Altera Corporation
November 2009
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