On Oct 27, 2011, Eric Botcazou <ebotca...@adacore.com> wrote: >> fwprop may propagate a SET_SRC that contains the last use of a REG to a >> later point, but it will leave the REG_DEAD note in place, even though >> it is no longer correct. I noticed this while investigating PR50826: >> the initialization of the internal_arg_pointer has a REG_DEAD note for >> %r29, but even after it is fwpropped, the note remains there. This >> patch fixes this bug.
> This isn't necessarily a bug, i.e. passes aren't required to maintain > REG_DEAD and REG_UNUSED notes up-to-date (another example is PR > rtl-opt/48773). Instead passes consuming these notes have to invoke > df_note_add_problem on entry. It looked confusing, and it wasn't hard to fix, but, ok, patch withdrawn. -- Alexandre Oliva, freedom fighter http://FSFLA.org/~lxoliva/ You must be the change you wish to see in the world. -- Gandhi Be Free! -- http://FSFLA.org/ FSF Latin America board member Free Software Evangelist Red Hat Brazil Compiler Engineer
