llvm/test/CodeGen/Generic/zero-probability.mir

# RUN: llc -o /dev/null %s 
# REQUIRES: asserts
# Makes sure that having a probability of 0x00000000 to branch to a successor
# doesn't hit an APInt assert in the MIParser.

--- |
  define i32 @main() local_unnamed_addr #0 {
  entry:
    ret i32 0
  
  other:
    ret i32 0
  }
  
  attributes #0 = { nounwind }
  
  !llvm.module.flags = !{!0, !1}
  !llvm.ident = !{!2}
  
  !0 = !{i32 1, !"wchar_size", i32 4}
  !1 = !{i32 7, !"PIC Level", i32 2}
  !2 = !{!"clang version 6.0.0"}
  !3 = !{!"branch_weights", i32 0, i32 -1}

...
---
name:            main
alignment:       2
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
tracksRegLiveness: true   
body:             |
  bb.0.entry:
    successors: %bb.1.other(0x00000000)
  bb.1.other:

...