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One-to-One C-to-Hardware Mapping
The fundamental iteration statement for the C2H Compiler is the do loop,
which evaluates its condition at the end of each iteration. See section
“Loop Pipelining” on page 3–42 for information about loop state
machines and scheduling.
Selection Statements
A selection statement ( if-else , case , switch , and ?: ) translates to a
multiplexer in hardware. The structure of the hardware depends on the
type of statement, as described in the following sections.
if Statement
An if-else statement translates to three elements in hardware:
■
■
■
Logic to perform all operations in the then block
Logic to perform all operations in the else block
Selection logic that determines which result to use
The results of each element are registered, and the registered signals feed
a multiplexer.
If the if statement has both a then and an else block, the operations for
both blocks execute in parallel. When all operations have completed, the
multiplexer selects which value propagates to subsequent statements,
based on the value of the control expression.
Figure 3–4 shows the circuit that results from the code in Example 3–2 .
Example 3–2. If-else Logic
if (foo > bar)
foo += bar;
else
foo *= bar;
3–6
Nios II C2H Compiler User Guide
9.1
Altera Corporation
November 2009
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