; LLVM IR from SourajitaDewasi/ComputerNetworks :: Flow Control Methods/SelectiveRepeat.ll (Z8simulatei)

; 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"

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

; Function Attrs: nounwind
declare i32 @rand() #1

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

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z8simulatei(i32 noundef %0) #2 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %12, %1
  %8 = load i32, ptr %5, align 4, !tbaa !5
  %9 = icmp slt i32 %8, 5
  br i1 %9, label %10, label %15

10:                                               ; preds = %7
  %11 = call i32 @rand() #3
  store i32 %11, ptr %4, align 4, !tbaa !5
  br label %12

12:                                               ; preds = %10
  %13 = load i32, ptr %5, align 4, !tbaa !5
  %14 = add nsw i32 %13, 1
  store i32 %14, ptr %5, align 4, !tbaa !5
  br label %7, !llvm.loop !9

15:                                               ; preds = %7
  %16 = load i32, ptr %4, align 4, !tbaa !5
  %17 = icmp eq i32 %16, 0
  br i1 %17, label %18, label %21

18:                                               ; preds = %15
  %19 = load i32, ptr %3, align 4, !tbaa !5
  %20 = call noundef i32 @_Z8simulatei(i32 noundef %19)
  store i32 %20, ptr %4, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %18, %15
  %22 = load i32, ptr %4, align 4, !tbaa !5
  %23 = load i32, ptr %3, align 4, !tbaa !5
  %24 = srem i32 %22, %23
  store i32 %24, ptr %5, align 4, !tbaa !5
  %25 = load i32, ptr %5, align 4, !tbaa !5
  %26 = icmp eq i32 %25, 0
  br i1 %26, label %27, label %29

27:                                               ; preds = %21
  %28 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %28, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %33

29:                                               ; preds = %21
  %30 = load i32, ptr %4, align 4, !tbaa !5
  %31 = load i32, ptr %3, align 4, !tbaa !5
  %32 = srem i32 %30, %31
  store i32 %32, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %33

33:                                               ; preds = %29, %27
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  %34 = load i32, ptr %2, align 4
  ret i32 %34
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind "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 = { mustprogress 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 #3 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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"

; Function Attrs: nounwind
declare i32 @rand() local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z8simulatei(i32 noundef %0) local_unnamed_addr #1 {
  %2 = tail call i32 @rand() #2
  %3 = tail call i32 @rand() #2
  %4 = tail call i32 @rand() #2
  %5 = tail call i32 @rand() #2
  %6 = tail call i32 @rand() #2
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %8, label %10

8:                                                ; preds = %1
  %9 = tail call noundef i32 @_Z8simulatei(i32 noundef %0)
  br label %10

10:                                               ; preds = %8, %1
  %.1 = phi i32 [ %9, %8 ], [ %6, %1 ]
  %11 = srem i32 %.1, %0
  %12 = icmp eq i32 %11, 0
  %. = select i1 %12, i32 %0, i32 %11
  ret i32 %.
}

attributes #0 = { nounwind "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 #1 = { mustprogress 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)"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LCSSAPass,LoopRotatePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass