Altera Nios II C2H Compiler Manuale Utente Scaricare il pdf (Pagina 50)

3–10 9.1 Altera Corporation

Nios II C2H Compiler User Guide November 2009

One-to-One C-to-Hardware Mapping

Table 3–4 shows an example of a switch statement converted to

equivalent if-else statements.

Figure 3–7 shows the logic that results of translating the if-else code

from Table 3–4.

Table 3–4. switch Statement Converted to if-else Statements

switch Implementation if-else Implementation

switch (byte_select)

{

case 1:

out = in & 0x0000ff00;

break;

case 2:

out = in & 0x00ff0000;

break;

case 3:

out = in & 0xff000000;

break;

default:

out = in & 0x000000ff;

}

if (byte_select == 1)

out = in & 0x0000ff00;

else

if (byte_select == 2)

out = in & 0x00ff0000;

else

if (byte_select == 3)

out = in & 0xff000000;

else

out = in & 0x000000ff;

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Altera Nios II C2H Compiler Manuale Utente Pagina 50