Re: BUG: GCC-4.4.x changes the function frame on some functions

[H. Peter Anvin]

On 11/19/2009 10:33 AM, Steven Rostedt wrote:
> 
> It has to align the entire stack? Why not just the variable within the
> stack?
> 

Because if the stack pointer isn't aligned, it won't know where it can
stuff the variable.  It has to pad *somewhere*, and since you may have
more than one such variable, the most efficient way -- and by far least
complex -- is for the compiler to align the stack when it sets up the
stack frame.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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