On Mon, Aug 01, 2011 at 06:14:27PM +0800, Jiangning Liu wrote:
> ARM. You are right, they were all fixed in back-ends in the past, but we
> should
> fix the bug in a general way to make GCC infrastructure stronger, rather
> than fixing the problem target-by-target and case-by-case! If you further
> look into the back-end fixes in x86 and PowerPC, you may find they looks
> quite similar in back-ends.
>
Red zone is only one difficulty, your patch is e.g. completely ignoring
existence of biased stack pointers (e.g. SPARC -m64 has them).
Some targets have stack growing in opposite direction, etc.
We have really a huge amount of very diverse ABIs and making the middle-end
grok what is an invalid stack access is difficult.
Jakub
