------- Comment #3 from matz at gcc dot gnu dot org 2010-01-14 15:56 ------- This code and var-tracking was developed in parallel, that's why debug insns are sometimes not handled correctly in the new out-of-ssa stuff. In this case debug insns should probably be ignored, and not lead to claiming a trivial conflict.
-- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42719