; LLVM IR from begeekmyfriend/leetcode :: 0027_remove_element (rm_elem)

; 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"

@.str = external hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local i32 @removeElement(ptr noundef, i32 noundef, i32 noundef) #0

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

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

; Function Attrs: nounwind uwtable
define dso_local i32 @main(i32 noundef %0, ptr noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  store i32 0, ptr %3, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #5
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #5
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = sub nsw i32 %9, 2
  %11 = sext i32 %10 to i64
  %12 = mul i64 %11, 4
  %13 = call noalias ptr @malloc(i64 noundef %12) #6
  store ptr %13, ptr %7, align 8, !tbaa !9
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %14

14:                                               ; preds = %31, %2
  %15 = load i32, ptr %6, align 4, !tbaa !5
  %16 = load i32, ptr %4, align 4, !tbaa !5
  %17 = sub nsw i32 %16, 2
  %18 = icmp slt i32 %15, %17
  br i1 %18, label %19, label %34

19:                                               ; preds = %14
  %20 = load ptr, ptr %5, align 8, !tbaa !9
  %21 = load i32, ptr %6, align 4, !tbaa !5
  %22 = add nsw i32 %21, 2
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds ptr, ptr %20, i64 %23
  %25 = load ptr, ptr %24, align 8, !tbaa !9
  %26 = call i32 @atoi(ptr noundef %25) #7
  %27 = load ptr, ptr %7, align 8, !tbaa !9
  %28 = load i32, ptr %6, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds i32, ptr %27, i64 %29
  store i32 %26, ptr %30, align 4, !tbaa !5
  br label %31

31:                                               ; preds = %19
  %32 = load i32, ptr %6, align 4, !tbaa !5
  %33 = add nsw i32 %32, 1
  store i32 %33, ptr %6, align 4, !tbaa !5
  br label %14, !llvm.loop !11

34:                                               ; preds = %14
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #5
  %35 = load ptr, ptr %7, align 8, !tbaa !9
  %36 = load i32, ptr %4, align 4, !tbaa !5
  %37 = sub nsw i32 %36, 2
  %38 = load ptr, ptr %5, align 8, !tbaa !9
  %39 = getelementptr inbounds ptr, ptr %38, i64 1
  %40 = load ptr, ptr %39, align 8, !tbaa !9
  %41 = call i32 @atoi(ptr noundef %40) #7
  %42 = call i32 @removeElement(ptr noundef %35, i32 noundef %37, i32 noundef %41)
  store i32 %42, ptr %8, align 4, !tbaa !5
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %43

43:                                               ; preds = %54, %34
  %44 = load i32, ptr %6, align 4, !tbaa !5
  %45 = load i32, ptr %8, align 4, !tbaa !5
  %46 = icmp slt i32 %44, %45
  br i1 %46, label %47, label %57

47:                                               ; preds = %43
  %48 = load ptr, ptr %7, align 8, !tbaa !9
  %49 = load i32, ptr %6, align 4, !tbaa !5
  %50 = sext i32 %49 to i64
  %51 = getelementptr inbounds i32, ptr %48, i64 %50
  %52 = load i32, ptr %51, align 4, !tbaa !5
  %53 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %52)
  br label %54

54:                                               ; preds = %47
  %55 = load i32, ptr %6, align 4, !tbaa !5
  %56 = add nsw i32 %55, 1
  store i32 %56, ptr %6, align 4, !tbaa !5
  br label %43, !llvm.loop !13

57:                                               ; preds = %43
  %58 = call i32 (ptr, ...) @printf(ptr noundef @.str.1)
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #5
  ret i32 0
}

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

; Function Attrs: inlinehint nounwind willreturn memory(read) uwtable
declare i32 @atoi(ptr noundef nonnull) #3

declare i32 @printf(ptr noundef, ...) #4

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" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nounwind allocsize(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 = { inlinehint nounwind willreturn memory(read) 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 #4 = { "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 #5 = { nounwind }
attributes #6 = { nounwind allocsize(0) }
attributes #7 = { nounwind willreturn memory(read) }

!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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !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"

@.str = external hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local i32 @removeElement(ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main(i32 noundef %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  %3 = add nsw i32 %0, -2
  %4 = sext i32 %3 to i64
  %5 = shl nsw i64 %4, 2
  %6 = tail call noalias ptr @malloc(i64 noundef %5) #4
  %invariant.gep = getelementptr inbounds i8, ptr %1, i64 16
  %7 = icmp sgt i32 %0, 2
  br i1 %7, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = zext nneg i32 %3 to i64
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %.lr.ph ]
  %gep = getelementptr inbounds ptr, ptr %invariant.gep, i64 %indvars.iv
  %8 = load ptr, ptr %gep, align 8, !tbaa !5
  %9 = tail call i32 @atoi(ptr nocapture noundef %8) #5
  %10 = getelementptr inbounds i32, ptr %6, i64 %indvars.iv
  store i32 %9, ptr %10, align 4, !tbaa !9
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !11

._crit_edge:                                      ; preds = %.lr.ph, %2
  %11 = getelementptr inbounds i8, ptr %1, i64 8
  %12 = load ptr, ptr %11, align 8, !tbaa !5
  %13 = tail call i32 @atoi(ptr nocapture noundef %12) #5
  %14 = tail call i32 @removeElement(ptr noundef %6, i32 noundef %3, i32 noundef %13)
  %15 = icmp sgt i32 %14, 0
  br i1 %15, label %.lr.ph19.preheader, label %._crit_edge20

.lr.ph19.preheader:                               ; preds = %._crit_edge
  %wide.trip.count25 = zext nneg i32 %14 to i64
  br label %.lr.ph19

.lr.ph19:                                         ; preds = %.lr.ph19.preheader, %.lr.ph19
  %indvars.iv22 = phi i64 [ 0, %.lr.ph19.preheader ], [ %indvars.iv.next23, %.lr.ph19 ]
  %16 = getelementptr inbounds i32, ptr %6, i64 %indvars.iv22
  %17 = load i32, ptr %16, align 4, !tbaa !9
  %18 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %17)
  %indvars.iv.next23 = add nuw nsw i64 %indvars.iv22, 1
  %exitcond26.not = icmp eq i64 %indvars.iv.next23, %wide.trip.count25
  br i1 %exitcond26.not, label %._crit_edge20, label %.lr.ph19, !llvm.loop !13

._crit_edge20:                                    ; preds = %.lr.ph19, %._crit_edge
  %19 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1)
  ret i32 0
}

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #1

; Function Attrs: inlinehint mustprogress nofree nounwind willreturn memory(read) uwtable
declare i32 @atoi(ptr nocapture noundef nonnull) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #3

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" }
attributes #1 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { inlinehint mustprogress nofree nounwind willreturn memory(read) 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 = { nofree 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 #4 = { nounwind allocsize(0) }
attributes #5 = { nounwind willreturn memory(read) }

!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"}
!13 = distinct !{!13, !12}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass