https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68381
--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> --- Author: segher Date: Tue Nov 24 06:43:20 2015 New Revision: 230786 URL: https://gcc.gnu.org/viewcvs?rev=230786&root=gcc&view=rev Log: combine: Handle aborts in is_parallel_of_n_reg_sets (PR68381) Some users of is_parallel_of_n_reg_sets disregard the clobbers in a parallel after it has returned "yes, this is a parallel of N sets and maybe some clobbers". But combine uses a clobber of const0_rtx to indicate substitution failure, so this leads to disaster. Fix this by checking for such special clobbers in is_parallel_of_n_reg_sets. PR rtl-optimization/68381 * combine.c (is_parallel_of_n_reg_sets): Return false if the pattern is poisoned. Modified: trunk/gcc/ChangeLog trunk/gcc/combine.c
