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Introduction to the C2H Compiler
C Code
Appropriate for
Hardware
Acceleration
This section describes guidelines for identifying code that is appropriate
for the C2H Compiler.
Ideal Acceleration Candidates
Sections of C code that consume the most CPU time with the least amount
of code are excellent candidates for acceleration. These tend to have the
following characteristics:
■
■
They contain a relatively small and simple loop or set of nested
loops.
They iterate over a set of data, performing one or more operations on
the data per iteration, and then store the result.
Examples of such iterative tasks include memory copy-and-modify tasks,
checksum calculations, data encryption, decryption, and filtering
operations. In each of these cases, the C code iterates over a set of data
many times, with either one or more memory reads or writes performed
during each iteration.
Example 1–1 demonstrates a routine that performs a checksum
calculation. This code excerpt is from a TCP/IP stack, and it calculates the
checksum over ranges of data in a network protocol stack. Checksum
calculations are typically a time-consuming part of an IP stack, because all
data transmitted and received must be validated, which requires the
processor to loop through all bytes.
Altera Corporation
November 2009
9.1
1–13
Nios II C2H Compiler User Guide
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