llvm dev - Apr 2012 - [LLVMdev] Little Problem about Variable memory allocating way in function

As I want to generate code for  the varaible declaration, at first, I
thought  AllocInstruction()could implement this.
However, the name "alloc" seems to allocate memory from heap
memory.and the
local variable in function should  stay at stack memory.
In which way did llvm allocate memeory to AllocInstruction() ? Would the
memory allocated by AllocInstruction() be recycled back?
If not what is the ideal way to locate memory for local varaible in
function?

ps: I've tried llvm.org/demo to watch the IR code, however, it seems to
optimize so much to eliminate any intermidate varaible.
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Hi Jianfei Hu,
> As I want to generate code for  the varaible declaration, at first, I
thought
> AllocInstruction()
AllocaInst

could implement this.
> However, the name "alloc" seems to allocate memory from heap
memory.and the
> local variable in function should  stay at stack memory.
AllocaInst represents stack memory, not heap memory, much like the alloca
standard library function.
> In which way did llvm allocate memeory to AllocInstruction() ? Would the
memory
> allocated by AllocInstruction() be recycled back?
> If not what is the ideal way to locate memory for local varaible in
function?
>
> ps: I've tried llvm.org/demo <http://llvm.org/demo> to watch the
IR code,
> however, it seems to optimize so much to eliminate any intermidate
varaible.
You can disable optimization by choosing "None" for "Optimization
level".

Ciao, Duncan.