On 07/12/2012 12:10 AM, Steven Bosscher wrote: > On Wed, Jul 11, 2012 at 11:31 PM, Bernd Schmidt <ber...@codesourcery.com> > wrote: >> On 03/26/2012 06:03 PM, Andreas Schwab wrote: >>> Bernd Schmidt <ber...@codesourcery.com> writes: >>> >>>> Does 4.7 still have the failure at all? >>> >>> Yes, see PR52573. >> >> Well, I still think having both REG_DEAD and REG_UNUSED for the same reg >> is bogus, but fixing that causes trouble in reg-stack. > > Oh? Before, during, or after reg-stack? IIRC reg-stack re-creates the > notes from scratch for the stack registers.
During - it relies on the ones it finds. Search for a comment mentioning fix_truncdi in a CLOBBER case. > Is it possible to "filter" one of the notes (REG_DEAD or REG_UNUSED) > out in add_reg_note? IMHO you're right that having both is bogus... Not even necessary, there's already code in df-problems to avoid adding REG_DEAD when it's already made a REG_UNUSED - but that code is explicitly disabled for CLOBBERs. Go figure. Bernd
