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Altera Corporation 9.1 3–5

November 2009 Nios II C2H Compiler User Guide

C-to-Hardware Mapping Reference

Figure 3–1 shows the hardware that results from the following statement:

int foo = a * b + x;

Figure 3–2. Pipelined Multiplication Operator

Figure 3–2 shows the hardware that results from the following statement:

int bar = a * b * c + x;

Figure 3–3. Two Stages of Pipelined Multiplication Operators

Iteration Statements

An iteration statement (do, for, or while), also known as a loop

statement, translates to a finite state machine in hardware. The state

machine controls execution of all the statements inside the loop block. A

loop inhibits (stalls) its parent state machine. In other words, if a loop

exists within an outer loop, the state machine for the outer loop stalls each

iteration and waits for the inner loop state machine to complete.

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Altera Nios II C2H Compiler Manuale Utente Pagina 45