参数资料
型号: IPT-C2H-NIOS
厂商: Altera
文件页数: 76/138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
Scheduling
Figure 3–16. Pointers Always Depend on Themselves
In this example, the C2H Compiler cannot schedule the two read
operations in parallel, because it assumes that the two address
expressions of my_ptr could overlap. Assuming that offset_a never
equals offset_b , to make these operations execute in parallel, you need
to declare another restricted pointer.
Figure 3–17 shows the dependency graph for Example 3–31 , which
introduces a new restricted pointer, my_ptr_b , to prevent the data
dependency present in Figure 3–16 .
Example 3–31. Using Another Pointer to Avoid Self-Dependence
void foo(int * _ _ restrict_ _ my_ptr,
int offset_a,
int offset_b)
{
int a, b;
int * _ _ restrict__ my_ptr_b = my_ptr;
a = my_ptr[offset_a];
my_ptr[offset_a] = a + 7;
b = my_ptr_b[offset_b];
my_ptr_b[offset_b] = b + 8;
}
3–36
Nios II C2H Compiler User Guide
9.1
Altera Corporation
November 2009
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