参数资料
型号: IPT-C2H-NIOS
厂商: Altera
文件页数: 124/138页
文件大小: 0K
描述: C2H COMPILER FOR NIOS II
标准包装: 1
系列: Nios®II
类型: Nios II
功能: C 到硬件编译器
许可证: 初始许可证
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
6–6
Nios II C2H Compiler User Guide
9.1
Altera Corporation
November 2009
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