Altera Nios II C2H Compiler Bedienungsanleitung PDF herunterladen (Seite 124)

6–6 9.1 Altera Corporation

Nios II C2H Compiler User Guide November 2009

Unshare Pointer Pragma

Example 6–5. Automatically Shared Master Port

#pragma altera_accelerate connect_variable ptr_a to onchip_memory_0

#pragma altera_accelerate connect_variable ptr_a to onchip_memory_1

#pragma altera_accelerate connect_variable ptr_b to onchip_memory_0

#pragma altera_accelerate connect_variable ptr_b to onchip_memory_1

if (x)

{

ptr_a = ONCHIP_MEMORY_1_BASE;

ptr_b = ONCHIP_MEMORY_2_BASE;

}

else

{

ptr_a = ONCHIP_MEMORY_2_BASE;

ptr_b = ONCHIP_MEMORY_1_BASE;

}

/* ... perform some dereference operations with ptr_a and ptr_b ... */

To overcome this problem, use the unshare_pointer pragma, which

instructs the compiler to always optimize for speed, and never defer

operations for the purposes of resource scheduling. The syntax is as

follows, for a pointer my_ptr in function my_func:

#pragma altera_accelerate unshare_pointer my_func/my_ptr

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Altera Nios II C2H Compiler Bedienungsanleitung Seite 124