; LLVM IR from devparthgarg/Data-Structures-and-Algorithms :: 05. Arrays/16 Trapping Rain Water/16a Trapping Rain Water.ll (Z13trapRainWaterPii)

; 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: mustprogress uwtable
define dso_local noundef i32 @_Z13trapRainWaterPii(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %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
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 1, ptr %6, align 4, !tbaa !9
  br label %12

12:                                               ; preds = %73, %2
  %13 = load i32, ptr %6, align 4, !tbaa !9
  %14 = load i32, ptr %4, align 4, !tbaa !9
  %15 = sub nsw i32 %14, 1
  %16 = icmp slt i32 %13, %15
  br i1 %16, label %18, label %17

17:                                               ; preds = %12
  store i32 2, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  br label %76

18:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  %20 = load i32, ptr %6, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds i32, ptr %19, i64 %21
  %23 = load i32, ptr %22, align 4, !tbaa !9
  store i32 %23, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  store i32 0, ptr %9, align 4, !tbaa !9
  br label %24

24:                                               ; preds = %36, %18
  %25 = load i32, ptr %9, align 4, !tbaa !9
  %26 = load i32, ptr %6, align 4, !tbaa !9
  %27 = icmp slt i32 %25, %26
  br i1 %27, label %29, label %28

28:                                               ; preds = %24
  store i32 5, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  br label %39

29:                                               ; preds = %24
  %30 = load ptr, ptr %3, align 8, !tbaa !5
  %31 = load i32, ptr %9, align 4, !tbaa !9
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds i32, ptr %30, i64 %32
  %34 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %8, ptr noundef nonnull align 4 dereferenceable(4) %33)
  %35 = load i32, ptr %34, align 4, !tbaa !9
  store i32 %35, ptr %8, align 4, !tbaa !9
  br label %36

36:                                               ; preds = %29
  %37 = load i32, ptr %9, align 4, !tbaa !9
  %38 = add nsw i32 %37, 1
  store i32 %38, ptr %9, align 4, !tbaa !9
  br label %24, !llvm.loop !11

39:                                               ; preds = %28
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  %40 = load ptr, ptr %3, align 8, !tbaa !5
  %41 = load i32, ptr %6, align 4, !tbaa !9
  %42 = sext i32 %41 to i64
  %43 = getelementptr inbounds i32, ptr %40, i64 %42
  %44 = load i32, ptr %43, align 4, !tbaa !9
  store i32 %44, ptr %10, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #3
  %45 = load i32, ptr %6, align 4, !tbaa !9
  %46 = add nsw i32 %45, 1
  store i32 %46, ptr %11, align 4, !tbaa !9
  br label %47

47:                                               ; preds = %59, %39
  %48 = load i32, ptr %11, align 4, !tbaa !9
  %49 = load i32, ptr %4, align 4, !tbaa !9
  %50 = icmp slt i32 %48, %49
  br i1 %50, label %52, label %51

51:                                               ; preds = %47
  store i32 8, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #3
  br label %62

52:                                               ; preds = %47
  %53 = load ptr, ptr %3, align 8, !tbaa !5
  %54 = load i32, ptr %11, align 4, !tbaa !9
  %55 = sext i32 %54 to i64
  %56 = getelementptr inbounds i32, ptr %53, i64 %55
  %57 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %10, ptr noundef nonnull align 4 dereferenceable(4) %56)
  %58 = load i32, ptr %57, align 4, !tbaa !9
  store i32 %58, ptr %10, align 4, !tbaa !9
  br label %59

59:                                               ; preds = %52
  %60 = load i32, ptr %11, align 4, !tbaa !9
  %61 = add nsw i32 %60, 1
  store i32 %61, ptr %11, align 4, !tbaa !9
  br label %47, !llvm.loop !13

62:                                               ; preds = %51
  %63 = load i32, ptr %5, align 4, !tbaa !9
  %64 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %10, ptr noundef nonnull align 4 dereferenceable(4) %8)
  %65 = load i32, ptr %64, align 4, !tbaa !9
  %66 = add nsw i32 %63, %65
  %67 = load ptr, ptr %3, align 8, !tbaa !5
  %68 = load i32, ptr %6, align 4, !tbaa !9
  %69 = sext i32 %68 to i64
  %70 = getelementptr inbounds i32, ptr %67, i64 %69
  %71 = load i32, ptr %70, align 4, !tbaa !9
  %72 = sub nsw i32 %66, %71
  store i32 %72, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  br label %73

73:                                               ; preds = %62
  %74 = load i32, ptr %6, align 4, !tbaa !9
  %75 = add nsw i32 %74, 1
  store i32 %75, ptr %6, align 4, !tbaa !9
  br label %12, !llvm.loop !14

76:                                               ; preds = %17
  %77 = load i32, ptr %5, align 4, !tbaa !9
  store i32 1, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret i32 %77
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #2

attributes #0 = { 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 #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { inlinehint 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 #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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}
!14 = distinct !{!14, !12}


; 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 nounwind uwtable
define dso_local noundef i32 @_Z13trapRainWaterPii(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = icmp sgt i32 %1, 2
  br i1 %5, label %.lr.ph29.preheader, label %._crit_edge30

.lr.ph29.preheader:                               ; preds = %2
  %6 = add nsw i32 %1, -1
  %wide.trip.count42 = zext nneg i32 %6 to i64
  %wide.trip.count37 = zext nneg i32 %1 to i64
  br label %.lr.ph29

._crit_edge30:                                    ; preds = %._crit_edge, %2
  %.023.lcssa = phi i32 [ 0, %2 ], [ %18, %._crit_edge ]
  ret i32 %.023.lcssa

.lr.ph29:                                         ; preds = %.lr.ph29.preheader, %._crit_edge
  %indvars.iv39 = phi i64 [ 1, %.lr.ph29.preheader ], [ %indvars.iv.next40, %._crit_edge ]
  %indvars.iv32 = phi i64 [ 2, %.lr.ph29.preheader ], [ %indvars.iv.next33, %._crit_edge ]
  %.02326 = phi i32 [ 0, %.lr.ph29.preheader ], [ %18, %._crit_edge ]
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #3
  %7 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv39
  %8 = load i32, ptr %7, align 4, !tbaa !5
  store i32 %8, ptr %3, align 4, !tbaa !5
  br label %10

.lr.ph.preheader:                                 ; preds = %10
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #3
  %9 = load i32, ptr %7, align 4, !tbaa !5
  store i32 %9, ptr %4, align 4, !tbaa !5
  %indvars.iv.next40 = add nuw nsw i64 %indvars.iv39, 1
  br label %.lr.ph

10:                                               ; preds = %.lr.ph29, %10
  %indvars.iv = phi i64 [ 0, %.lr.ph29 ], [ %indvars.iv.next, %10 ]
  %11 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %12 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %3, ptr noundef nonnull align 4 dereferenceable(4) %11)
  %13 = load i32, ptr %12, align 4, !tbaa !5
  store i32 %13, ptr %3, align 4, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %indvars.iv39
  br i1 %exitcond.not, label %.lr.ph.preheader, label %10, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph
  %14 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %4, ptr noundef nonnull align 4 dereferenceable(4) %3)
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %16 = add nsw i32 %15, %.02326
  %17 = load i32, ptr %7, align 4, !tbaa !5
  %18 = sub i32 %16, %17
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #3
  %indvars.iv.next33 = add nuw nsw i64 %indvars.iv32, 1
  %exitcond43.not = icmp eq i64 %indvars.iv.next40, %wide.trip.count42
  br i1 %exitcond43.not, label %._crit_edge30, label %.lr.ph29, !llvm.loop !11

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv34 = phi i64 [ %indvars.iv32, %.lr.ph.preheader ], [ %indvars.iv.next35, %.lr.ph ]
  %19 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv34
  %20 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %4, ptr noundef nonnull align 4 dereferenceable(4) %19)
  %21 = load i32, ptr %20, align 4, !tbaa !5
  store i32 %21, ptr %4, align 4, !tbaa !5
  %indvars.iv.next35 = add nuw nsw i64 %indvars.iv34, 1
  %exitcond38.not = icmp eq i64 %indvars.iv.next35, %wide.trip.count37
  br i1 %exitcond38.not, label %._crit_edge, label %.lr.ph, !llvm.loop !12
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3minIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #2

attributes #0 = { 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 #1 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { inlinehint 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 #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"}
!11 = distinct !{!11, !10}
!12 = distinct !{!12, !10}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SCCPPass,SROAPass,SimplifyCFGPass