Hi Wolfgang,
On Monday 04 February 2008, Wolfgang Denk wrote:
A possible approach to this problem is to avoid using a global register variable and use a plain global variable instead. The necessary code for this is already there (just commented out); when I implemented this initially, I decided to use a global register variable because it gave slightly smaller code.
Here is an overview of the effect (test build of current top of tree for the "katmai" (PPC440SPe) board):
ELDK Version Register-Var. Globale Var. text data bss dec text data bss dec 4.0 243292 13700 322340 579332 244160 13808 322340 580308 4.1 243292 13700 322340 579332 244160 13808 322340 580308 4.2 section ... overlaps previous 245496 13188 322340 581024
As you can see, the difference in code size is less than 1 KiB.
Nice.
My suggestion is to change the code to use a plain global variable, however I need feedback if we can / want to do that as it effects *ALL* PowerPC boards.
Acked-by for this change from me. I tested successfully on AMCC Katmai, which now fits again in the 256k with GCC 4.2.2.
Thanks.
Best regards, Stefan
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