https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66790
--- Comment #35 from Paolo Bonzini <bonzini at gnu dot org> --- Comment on attachment 36377 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36377 Updated candidate patch > + This problem determines which registers may be uninitialized. It first > + assumes these are all initialized and then it eliminates the ones > reached > + by paths without crossing a definition. The IN bitmap is clear at first > + (i.e. all registers are assumed not to be initialized) so don't consider > + its value the first time. */ > + return bitmap_and_into (op1, op2); Is this comment obsolete? The IN bitmap is all set at first. Otherwise looks good.
