; LLVM IR from aap/pdp6 :: tools (rel)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@infp = external dso_local global ptr, align 8
@type = external dso_local global i32, align 4
@stdin = external global ptr, align 8

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @peek() #1

; Function Attrs: nounwind uwtable
declare dso_local void @type0() #1

; Function Attrs: nounwind uwtable
declare dso_local void @type1() #1

; Function Attrs: nounwind uwtable
define dso_local i32 @main() #1 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i64, align 8
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  %4 = load ptr, ptr @stdin, align 8, !tbaa !5
  store ptr %4, ptr @infp, align 8, !tbaa !5
  store i32 0, ptr @type, align 4, !tbaa !9
  br label %5

5:                                                ; preds = %13, %0
  %6 = call i32 @peek()
  %7 = icmp ne i32 %6, -1
  br i1 %7, label %8, label %14

8:                                                ; preds = %5
  %9 = load i32, ptr @type, align 4, !tbaa !9
  switch i32 %9, label %12 [
    i32 0, label %10
    i32 1, label %11
  ]

10:                                               ; preds = %8
  call void @type0()
  br label %13

11:                                               ; preds = %8
  call void @type1()
  br label %13

12:                                               ; preds = %8
  br label %15

13:                                               ; preds = %11, %10
  br label %5, !llvm.loop !11

14:                                               ; preds = %5
  br label %15

15:                                               ; preds = %14, %12
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #2
  ret i32 0
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #2 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@infp = external dso_local local_unnamed_addr global ptr, align 8
@type = external dso_local local_unnamed_addr global i32, align 4
@stdin = external local_unnamed_addr global ptr, align 8

; Function Attrs: nounwind uwtable
declare dso_local i32 @peek() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local void @type0() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local void @type1() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = load ptr, ptr @stdin, align 8, !tbaa !5
  store ptr %1, ptr @infp, align 8, !tbaa !5
  store i32 0, ptr @type, align 4, !tbaa !9
  %2 = tail call i32 @peek()
  %.not1 = icmp eq i32 %2, -1
  br i1 %.not1, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %6
  %3 = load i32, ptr @type, align 4, !tbaa !9
  switch i32 %3, label %._crit_edge [
    i32 0, label %4
    i32 1, label %5
  ]

4:                                                ; preds = %.lr.ph
  tail call void @type0()
  br label %6

5:                                                ; preds = %.lr.ph
  tail call void @type1()
  br label %6

6:                                                ; preds = %5, %4
  %7 = tail call i32 @peek()
  %.not = icmp eq i32 %7, -1
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !11

._crit_edge:                                      ; preds = %.lr.ph, %6, %0
  ret i32 0
}

attributes #0 = { nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass