Do explicitly managed stack frames free the stack register?

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1

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

2

Nope, the stack pointer (e.g. ESP) is still needed for local spill code within the function, allocas, etc.

-Chris

3

[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 :slight_smile:

Cheers,

4

But unfortuantely, this assumes that everything has been converted to continuation passing style with only tail calls remaining... not good for the C ABI :slight_smile:

-Chris