[Bug target/64402] mep-elf ICE in pre_and_rev_post_order_compute, at cfganal.c:1022

[bernd.edlinger at hotmail dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64402

--- Comment #3 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
Created attachment 37172
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37172&action=edit
Patch to fix ICE and make interrupt restore r0

This patch fixes the ICE and makes interrupt functions
also restore r0, which they did not do currently.

test case:

void __attribute__((interrupt))
intf(void)
{
   asm("":::"$0", "$1");
}

$0 and $1 got saved, but only $1 got restored.

This would be fixed with this patch too.

Note that the MEP port is currently proposed to be
deprecated: https://gcc.gnu.org/ml/gcc/2015-12/msg00045.html

So, if you are actually using the mep port better speak up now.