c/7871: ICE on legal code, global register variables problems

[Jim Wilson]

On Wed, 2003-04-02 at 15:49, Richard Zidlicky wrote:
> how does this differ from ´normal´ global variables?

Normal global variables are stored in memory instead of in registers.
We don't add REG_NOTES and/or LOG_LINKS for values in memory like we do
for registers.  Also, most optimization passes known that memory is
volatile across function calls, but they assume (call-saved) registers
will be preserved.  Thus we need special treatment for global register
variables.

> my application is still miscompiled with this patch. 

OK, so we need more work here.

> Tested only gcc-3.2, should this make any difference?

No.

I haven't had a chance to do any more work on this problem since my
original message, and won't for a while.  I'm in the middle of a 4000 km
international move, and will be offline for the next week or two.

Jim