search for: f_overflow

...information clobbered by the earlier pass LiveVariables. I wonder whether this is a bug in the LiveVariables pass and would appreciate feedback. Let me expand with a small example, Suppose my target declares machine instruction type FOO that implicitly writes a condition-code register named 'F_OVERFLOW'. F_OVERFLOW is a physical register and is not register-allocatable. Consider this sequence of instructions: A: %vreg4<def> = FOO %vreg1<kill>, %F_OVERFLOW<imp-def,dead> B: %vreg5<def> = FOO %vreg2<kill>, %F_OVERFLOW<imp-def,dead> C: %vreg6<def&...