% cat eh2.ll
; ModuleID = 'eh1.cc'

declare void @f()
declare void @g()
declare void @e()

declare i32 @__gxx_personality_v0(...)

define void @test() uwtable {
entry:
  call void @f()
  invoke void @e() to label %cont unwind label %lpad

cont:
  call void @g()
  unreachable

lpad:
  %lpad.32 = landingpad { i8*, i32 } personality i8*
               bitcast (i32 (...)* @__gxx_personality_v0 to i8*) cleanup
  ret void
}


% ./bin/opt -analyze -branch-prob eh2.ll
Printing analysis 'Branch Probability Analysis' for function 'test':
---- Branch Probabilities ----
  edge entry -> cont probability is 1 / 1024 = 0.0976562%
  edge entry -> lpad probability is 1023 / 1024 = 99.9023% [HOT edge]



% ./bin/llc -O2 -debug-only=block-placement2 -enable-block-placement -o - eh2.ll
        .file   "eh2.ll"
Attempting merge from: BB#0 (derived from LLVM BB 'entry')
    BB#1 (derived from LLVM BB 'cont') -> 16 / 32 = 50% (prob)
    BB#2 (derived from LLVM BB 'lpad') -> 16 / 32 = 50% (prob)