gistfile1.txt

; ModuleID = 'test'

@jumper = internal global [256 x i8] zeroinitializer

declare i32 @setjmp(i8*)

declare void @longjmp(i8*, i32) noreturn nounwind

define i64 @b() {
entry:
  ret i64 1
}

define i64 @a() {
entry:
  %0 = call i64 @b()
  ret i64 %0
}

define i64 @somefunction() {
entry:
  %0 = getelementptr inbounds [256 x i8]* @jumper, i64 0, i64 0
  call void @longjmp(i8* %0, i32 99)
  %1 = call i64 @a()
  ret i64 %1
}

define i64 @main() {
entry:
  %0 = getelementptr inbounds [256 x i8]* @jumper, i64 0, i64 0
  %1 = call i32 @setjmp(i8* %0)
  %2 = icmp eq i32 %1, 0
  br i1 %2, label %if, label %else

if:                                               ; preds = %entry
  %3 = call i64 @somefunction()
  ret i64 %3

else:                                             ; preds = %entry
  %4 = zext i32 %1 to i64
  ret i64 %4
}