On Sun, Jun 8, 2008 at 1:23 AM, Bill Bumgarner <[EMAIL PROTECTED]> wrote:
> Consider:
>
> {
> int foo;
>
> ... calculate on foo ...
>
> int bar = getirdone(foo);
>
> while(1) {
> func(bar);
> func2(bar);
> ... etc ...
> }
> }
>
> Without being able to recycle the space used by foo and bar, the compiler
> will generate code the pays the price of that space being consumed for all
> of the while loop, which could be the vast majority of the run time of the
> application.
>
> As well, if foo / bar fall in a register, then those registers would have to
> be preserved for all of the while loop, too, either by not being available
> to the bulk of the program (which raises some serious codegen issues) or
> being moved out/in the registers every time one of the funcs in the while
> loop is called or returns.
I was thinking that after the call to getirdone(foo), instead of
simply overwriting the value of foo in the register, the compiler
could move it to a space on the stack it had previously reserved for
that purpose.
Hamish
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