; LLVM IR from VastoLorde95/Competitive-Programming :: Hackerrank/101 Hacks/101 Hack 2016/101 Hack May/Problem E/E.ll (Z11getSmallestii)

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

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_Z4dfs2iiRi(i32 noundef, i32 noundef, ptr noundef nonnull align 4 dereferenceable(4)) #1

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z11getSmallestii(i32 noundef %0, i32 noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 1, ptr %6, align 4, !tbaa !5
  br label %10

10:                                               ; preds = %37, %2
  br label %11

11:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %12 = load i32, ptr %6, align 4, !tbaa !5
  store i32 %12, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %13 = load i32, ptr %6, align 4, !tbaa !5
  store i32 %13, ptr %8, align 4, !tbaa !5
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = call noundef zeroext i1 @_Z4dfs2iiRi(i32 noundef %14, i32 noundef -1, ptr noundef nonnull align 4 dereferenceable(4) %7)
  %16 = load i32, ptr %5, align 4, !tbaa !5
  %17 = call noundef zeroext i1 @_Z4dfs2iiRi(i32 noundef %16, i32 noundef -1, ptr noundef nonnull align 4 dereferenceable(4) %8)
  %18 = load i32, ptr %7, align 4, !tbaa !5
  %19 = icmp eq i32 %18, -1
  br i1 %19, label %20, label %26

20:                                               ; preds = %11
  %21 = load i32, ptr %8, align 4, !tbaa !5
  %22 = icmp eq i32 %21, -1
  br i1 %22, label %23, label %26

23:                                               ; preds = %20
  %24 = load i32, ptr %6, align 4, !tbaa !5
  %25 = shl i32 %24, 1
  store i32 %25, ptr %6, align 4, !tbaa !5
  br label %34

26:                                               ; preds = %20, %11
  %27 = load i32, ptr %7, align 4, !tbaa !5
  %28 = load i32, ptr %8, align 4, !tbaa !5
  %29 = icmp sge i32 %27, %28
  br i1 %29, label %30, label %32

30:                                               ; preds = %26
  %31 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %31, ptr %3, align 4
  store i32 1, ptr %9, align 4
  br label %35

32:                                               ; preds = %26
  %33 = load i32, ptr %5, align 4, !tbaa !5
  store i32 %33, ptr %3, align 4
  store i32 1, ptr %9, align 4
  br label %35

34:                                               ; preds = %23
  store i32 0, ptr %9, align 4
  br label %35

35:                                               ; preds = %34, %32, %30
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  %36 = load i32, ptr %9, align 4
  switch i32 %36, label %38 [
    i32 0, label %37
  ]

37:                                               ; preds = %35
  br label %10, !llvm.loop !9

38:                                               ; preds = %35
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %39 = load i32, ptr %3, align 4
  ret i32 %39
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = !{!"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: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

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

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_Z4dfs2iiRi(i32 noundef, i32 noundef, ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z11getSmallestii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #1 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  br label %5

5:                                                ; preds = %5, %2
  %.010 = phi i32 [ 1, %2 ], [ %12, %5 ]
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #2
  store i32 %.010, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #2
  store i32 %.010, ptr %4, align 4, !tbaa !5
  %6 = call noundef zeroext i1 @_Z4dfs2iiRi(i32 noundef %0, i32 noundef -1, ptr noundef nonnull align 4 dereferenceable(4) %3)
  %7 = call noundef zeroext i1 @_Z4dfs2iiRi(i32 noundef %1, i32 noundef -1, ptr noundef nonnull align 4 dereferenceable(4) %4)
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = icmp eq i32 %8, -1
  %10 = load i32, ptr %4, align 4
  %11 = icmp eq i32 %10, -1
  %or.cond = select i1 %9, i1 %11, i1 false
  %12 = shl i32 %.010, 1
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #2
  br i1 %or.cond, label %5, label %13, !llvm.loop !9

13:                                               ; preds = %5
  %.not = icmp slt i32 %8, %10
  %. = select i1 %.not, i32 %1, i32 %0
  ret i32 %.
}

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


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopUnrollPass,SROAPass,SimplifyCFGPass