llvm dev - Aug 2007 - [LLVMdev] Do explicitly managed stack frames free the stack register?

Just out of curiosity, now that explicitly managed stack frames [1]
are possible (given support in the code generators), is the stack
register freed for other uses when the LLVM system stack isn't being
used?

Sandro

[1] http://nondot.org/sabre/LLVMNotes/ExplicitlyManagedStackFrames.txt

On Aug 16, 2007, at 11:48 AM, Sandro Magi wrote:
> Just out of curiosity, now that explicitly managed stack frames [1]
> are possible (given support in the code generators), is the stack
> register freed for other uses when the LLVM system stack isn't being
> used?
Nope, the stack pointer (e.g. ESP) is still needed for local spill  
code within the function, allocas, etc.

-Chris

> [1] http://nondot.org/sabre/LLVMNotes/ExplicitlyManagedStackFrames.txt
Interesting. Something like this is more then sufficient for
implementing by value structure passing at the llvm level :-)

Cheers,
-- 
Rafael Avila de Espindola

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On Mon, 20 Aug 2007, Rafael Espindola wrote:
>> [1] http://nondot.org/sabre/LLVMNotes/ExplicitlyManagedStackFrames.txt
> Interesting. Something like this is more then sufficient for
> implementing by value structure passing at the llvm level :-)
But unfortuantely, this assumes that everything has been converted to 
continuation passing style with only tail calls remaining... not good for 
the C ABI :)

-Chris

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