Altera Nios II C2H Compiler Manual do Utilizador descarregar pdf (Página 52)

3–12 9.1 Altera Corporation

Nios II C2H Compiler User Guide November 2009

One-to-One C-to-Hardware Mapping

Table 3–5 shows an example of a subfunction called by two different

functions. In this case, functions foo() and bar() both call a

subfunction foobar_sub().

Figure 3–8 shows the hardware structure of the accelerators resulting

from the code in Table 3–5. Logic for the function foobar_sub() exists

within both accelerators.

Figure 3–8. Shared Subfunction Logic

The C2H Compiler does not support external subfunctions. You must

locate the subfunction in the same source file as the accelerated function.

This is because, unlike the #include construct, a C external function

reference requires the presence of a linker. The C2H Compiler has no

linker.

Table 3–5. Shared Subfunction foobar_sub()

Top-Level Accelerated Function: foo() Top-Level Accelerated Function: bar()

void foo(int *data_in,

int *data_out)

{

...

foobar_sub();

...

}

void bar(int *data_in,

int *data_out)

{

...

foobar_sub();

...

foobar_sub();

...

}

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Altera Nios II C2H Compiler Manual do Utilizador Página 52