Altera Nios II C2H Compiler - 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.
Figure 3–1 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
“Iteration Statements” on
page 3–5 .
> 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
“Indirection Operator (Pointer
Dereference)” on page 3–16
.
++ 32-bit up-counter (two total for
*a++ and *b++ )
* (multiply) 32x32=64-bit multiplier
len--; -- 32-bit down-counter