Re: RFA: patch for coalescing stack slots

[Dale Johannesen <dalej at apple dot com>]

On Apr 13, 2004, at 12:49 PM, Vladimir Makarov wrote:
>  Currently gcc original global register allocator and reload has a
> primitive code for sharing stack slots for spilled registers.
>
>  This patch makes coalescing stack slots of registers which have not
> obtained hard registers and slots used for spilled registers.
>
>  The patch decreases size of stack frames allocated for functions.
>
>  The patch also decrease code size for some platforms like x86
> because in many cases smaller displacements are used (we are using the
> first found space approach).

This is going to inhibit scheduling in some cases, isn't it, by reusing 
the
same memory location?  Your numbers are persuasive that it's a win 
overall
on x86, but I'm wondering if this is not necessarily true everywhere.
Do you have SPEC results for ppc?