https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85645
--- Comment #12 from Segher Boessenkool <segher at gcc dot gnu.org> --- Author: segher Date: Wed May 9 12:51:00 2018 New Revision: 260077 URL: https://gcc.gnu.org/viewcvs?rev=260077&root=gcc&view=rev Log: rs6000: Give an argument to every REG_CFA_REGISTER (PR85645) The one for the prologue mflr did not have any value set, which means use the SET that is in the insn pattern. This works fine, except when some late pass decides to replace the SET_SRC -- this changes the meaning of the REG_CFA_REGISTER! Such passes should not do these things, but let's be more explicit here, for extra robustness. It could be argued that this defaulting is a design misfeature (it does not save much space either, etc.) PR rtl-optimization/85645 * config/rs6000/rs6000.c (rs6000_emit_prologue_components): Put a SET in the REG_CFA_REGISTER note for LR, don't leave it empty. Modified: trunk/gcc/ChangeLog trunk/gcc/config/rs6000/rs6000.c
