Assignments – Altera Nios II C2H Compiler User Manual

Page 42

3–2

9.1

Altera Corporation

Nios II C2H Compiler User Guide

November 2009

One-to-One C-to-Hardware Mapping

Table 3–1

lists the equivalent hardware structures resulting from this

function.

Assignments

A C assignment operator stores the value of an expression to a variable.
As a general rule, every assignment operator in the C code, such as

translates to a registered signal in hardware. The value of an assignment's
expression is calculated in one clock cycle.

shows the

hardware that results from the following statement:

int sum = x + y;

Figure 3–1. Hardware Resulting from Assignment

Table 3–1. Hardware Structure for Arithmetic and Logical Operators

Line

C Element

Hardware Structure

while (len > 0) {

while

Finite state machine with
nominal control logic. Refer to
section

32-bit comparator

result += *a++ * *b++;

64-bit adder

(pointer)

Avalon-MM master port to read
data (two total for

*a++

and

*b++

). Refer to section

32-bit up-counter (two total for

*a++

and

*b++

)

(multiply)

32x32=64-bit multiplier

len--;

32-bit down-counter