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C-to-Hardware Mapping Reference
Figure 3–22 shows the dependency graph for the do loop in
Example 3–36 , which has loop-carried dependencies.
Example 3–36. Loop-Carried Dependency
int simple_hash(int *data, int len)
{
int hash = 0;
do
{
int data_word = *data++;
hash = hash + data_word;
hash = hash ^ data_word;
} while (len--);
return hash;
}
Figure 3–22. Loop-Carried Dependency
Variables data and hash have loop-carried dependencies, illustrated by
the cyclic arrows in Figure 3–22 . The arrow for hash indicates that the
calculation on State 1 in iteration N is dependent on the result of the
calculation from State 2 in iteration ( N -1). The arrow for data in State 0
illustrates the ideal case in which a state depends only on its own output.
The ideal case does not restrict the scheduling of successive iterations.
Altera Corporation
November 2009
9.1
3–45
Nios II C2H Compiler User Guide
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