https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126382
--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> --- (In reply to Reshma Roy from comment #4) > (In reply to H.J. Lu from comment #3) > > Created attachment 65121 [details] > > A patch > > > > Try this. > > Thanks for the patch, it fixes the issue. > > Just to understand this better: the problem was that %r10 is live at the > entry block but has no reaching definition yet (its defined later, in the > prologue-epilog pass later in the pass pipeline), so its missing from > DF_LIVE_IN. Could other registers hit the same problem, live across the > insertion point, but defined later? If so, would using DF_LR_IN for the > whole check be a general fix, since it's a superset of DF_LIVE_IN? I am not aware of other registers like DRAP.
