; LLVM IR from ImChong/Practice_LeetCode_C :: F02_Programming_Topics/F02_Algorithm/04_Backtracking/01_combine (main)

; 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"

@__const.Test1.expectRtnColSize = external hidden unnamed_addr constant [6 x i32], align 16

; Function Attrs: nounwind uwtable
define dso_local void @Test1() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca [6 x i32], align 16
  %8 = alloca [6 x ptr], align 16
  %9 = alloca [2 x i32], align 4
  %10 = alloca [2 x i32], align 4
  %11 = alloca [2 x i32], align 4
  %12 = alloca [2 x i32], align 4
  %13 = alloca [2 x i32], align 4
  %14 = alloca [2 x i32], align 4
  %15 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #5
  store i32 4, ptr %1, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  store i32 2, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #5
  %16 = load i32, ptr %1, align 4, !tbaa !5
  %17 = load i32, ptr %2, align 4, !tbaa !5
  %18 = call ptr @combine(i32 noundef %16, i32 noundef %17, ptr noundef %3, ptr noundef %4)
  store ptr %18, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #5
  store i32 6, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 24, ptr %7) #5
  call void @llvm.memcpy.p0.p0.i64(ptr align 16 %7, ptr align 16 @__const.Test1.expectRtnColSize, i64 24, i1 false)
  call void @llvm.lifetime.start.p0(i64 48, ptr %8) #5
  store i32 1, ptr %9, align 4, !tbaa !5
  %19 = getelementptr inbounds i32, ptr %9, i64 1
  store i32 2, ptr %19, align 4, !tbaa !5
  %20 = getelementptr inbounds [2 x i32], ptr %9, i64 0, i64 0
  store ptr %20, ptr %8, align 8, !tbaa !9
  %21 = getelementptr inbounds ptr, ptr %8, i64 1
  store i32 1, ptr %10, align 4, !tbaa !5
  %22 = getelementptr inbounds i32, ptr %10, i64 1
  store i32 3, ptr %22, align 4, !tbaa !5
  %23 = getelementptr inbounds [2 x i32], ptr %10, i64 0, i64 0
  store ptr %23, ptr %21, align 8, !tbaa !9
  %24 = getelementptr inbounds ptr, ptr %8, i64 2
  store i32 1, ptr %11, align 4, !tbaa !5
  %25 = getelementptr inbounds i32, ptr %11, i64 1
  store i32 4, ptr %25, align 4, !tbaa !5
  %26 = getelementptr inbounds [2 x i32], ptr %11, i64 0, i64 0
  store ptr %26, ptr %24, align 8, !tbaa !9
  %27 = getelementptr inbounds ptr, ptr %8, i64 3
  store i32 2, ptr %12, align 4, !tbaa !5
  %28 = getelementptr inbounds i32, ptr %12, i64 1
  store i32 3, ptr %28, align 4, !tbaa !5
  %29 = getelementptr inbounds [2 x i32], ptr %12, i64 0, i64 0
  store ptr %29, ptr %27, align 8, !tbaa !9
  %30 = getelementptr inbounds ptr, ptr %8, i64 4
  store i32 2, ptr %13, align 4, !tbaa !5
  %31 = getelementptr inbounds i32, ptr %13, i64 1
  store i32 4, ptr %31, align 4, !tbaa !5
  %32 = getelementptr inbounds [2 x i32], ptr %13, i64 0, i64 0
  store ptr %32, ptr %30, align 8, !tbaa !9
  %33 = getelementptr inbounds ptr, ptr %8, i64 5
  store i32 3, ptr %14, align 4, !tbaa !5
  %34 = getelementptr inbounds i32, ptr %14, i64 1
  store i32 4, ptr %34, align 4, !tbaa !5
  %35 = getelementptr inbounds [2 x i32], ptr %14, i64 0, i64 0
  store ptr %35, ptr %33, align 8, !tbaa !9
  %36 = getelementptr inbounds [6 x ptr], ptr %8, i64 0, i64 0
  %37 = load i32, ptr %6, align 4, !tbaa !5
  %38 = getelementptr inbounds [6 x i32], ptr %7, i64 0, i64 0
  %39 = load ptr, ptr %5, align 8, !tbaa !9
  %40 = load i32, ptr %3, align 4, !tbaa !5
  %41 = load ptr, ptr %4, align 8, !tbaa !9
  %42 = call i32 @Validate_Array2D(i8 noundef signext 49, ptr noundef %36, i32 noundef %37, ptr noundef %38, ptr noundef %39, i32 noundef %40, ptr noundef %41, i32 noundef 0)
  call void @llvm.lifetime.start.p0(i64 4, ptr %15) #5
  store i32 0, ptr %15, align 4, !tbaa !5
  br label %43

43:                                               ; preds = %54, %0
  %44 = load i32, ptr %15, align 4, !tbaa !5
  %45 = load i32, ptr %3, align 4, !tbaa !5
  %46 = icmp slt i32 %44, %45
  br i1 %46, label %48, label %47

47:                                               ; preds = %43
  call void @llvm.lifetime.end.p0(i64 4, ptr %15) #5
  br label %57

48:                                               ; preds = %43
  %49 = load ptr, ptr %5, align 8, !tbaa !9
  %50 = load i32, ptr %15, align 4, !tbaa !5
  %51 = sext i32 %50 to i64
  %52 = getelementptr inbounds ptr, ptr %49, i64 %51
  %53 = load ptr, ptr %52, align 8, !tbaa !9
  call void @free(ptr noundef %53) #5
  br label %54

54:                                               ; preds = %48
  %55 = load i32, ptr %15, align 4, !tbaa !5
  %56 = add nsw i32 %55, 1
  store i32 %56, ptr %15, align 4, !tbaa !5
  br label %43, !llvm.loop !11

57:                                               ; preds = %47
  %58 = load ptr, ptr %5, align 8, !tbaa !9
  call void @free(ptr noundef %58) #5
  %59 = load ptr, ptr %4, align 8, !tbaa !9
  call void @free(ptr noundef %59) #5
  call void @llvm.lifetime.end.p0(i64 48, ptr %8) #5
  call void @llvm.lifetime.end.p0(i64 24, ptr %7) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #5
  ret void
}

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

declare ptr @combine(i32 noundef, i32 noundef, ptr noundef, ptr noundef) #2

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #3

declare i32 @Validate_Array2D(i8 noundef signext, ptr noundef, i32 noundef, ptr noundef, ptr noundef, i32 noundef, ptr noundef, i32 noundef) #2

; Function Attrs: nounwind
declare void @free(ptr noundef) #4

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

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 = { "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 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { 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 #5 = { 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !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"

@__const.Test1.expectRtnColSize = external hidden unnamed_addr constant [6 x i32], align 16

; Function Attrs: nounwind uwtable
define dso_local void @Test1() local_unnamed_addr #0 {
  %1 = alloca i32, align 4
  %2 = alloca ptr, align 8
  %3 = alloca [6 x i32], align 16
  %4 = alloca [6 x ptr], align 16
  %5 = alloca [2 x i32], align 4
  %6 = alloca [2 x i32], align 4
  %7 = alloca [2 x i32], align 4
  %8 = alloca [2 x i32], align 4
  %9 = alloca [2 x i32], align 4
  %10 = alloca [2 x i32], align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #5
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #5
  %11 = call ptr @combine(i32 noundef 4, i32 noundef 2, ptr noundef nonnull %1, ptr noundef nonnull %2) #5
  call void @llvm.lifetime.start.p0(i64 24, ptr nonnull %3) #5
  call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 16 dereferenceable(24) %3, ptr noundef nonnull align 16 dereferenceable(24) @__const.Test1.expectRtnColSize, i64 24, i1 false)
  call void @llvm.lifetime.start.p0(i64 48, ptr nonnull %4) #5
  store i32 1, ptr %5, align 4, !tbaa !5
  %12 = getelementptr inbounds i8, ptr %5, i64 4
  store i32 2, ptr %12, align 4, !tbaa !5
  store ptr %5, ptr %4, align 16, !tbaa !9
  %13 = getelementptr inbounds i8, ptr %4, i64 8
  store i32 1, ptr %6, align 4, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %6, i64 4
  store i32 3, ptr %14, align 4, !tbaa !5
  store ptr %6, ptr %13, align 8, !tbaa !9
  %15 = getelementptr inbounds i8, ptr %4, i64 16
  store i32 1, ptr %7, align 4, !tbaa !5
  %16 = getelementptr inbounds i8, ptr %7, i64 4
  store i32 4, ptr %16, align 4, !tbaa !5
  store ptr %7, ptr %15, align 16, !tbaa !9
  %17 = getelementptr inbounds i8, ptr %4, i64 24
  store i32 2, ptr %8, align 4, !tbaa !5
  %18 = getelementptr inbounds i8, ptr %8, i64 4
  store i32 3, ptr %18, align 4, !tbaa !5
  store ptr %8, ptr %17, align 8, !tbaa !9
  %19 = getelementptr inbounds i8, ptr %4, i64 32
  store i32 2, ptr %9, align 4, !tbaa !5
  %20 = getelementptr inbounds i8, ptr %9, i64 4
  store i32 4, ptr %20, align 4, !tbaa !5
  store ptr %9, ptr %19, align 16, !tbaa !9
  %21 = getelementptr inbounds i8, ptr %4, i64 40
  store i32 3, ptr %10, align 4, !tbaa !5
  %22 = getelementptr inbounds i8, ptr %10, i64 4
  store i32 4, ptr %22, align 4, !tbaa !5
  store ptr %10, ptr %21, align 8, !tbaa !9
  %23 = load i32, ptr %1, align 4, !tbaa !5
  %24 = load ptr, ptr %2, align 8, !tbaa !9
  %25 = call i32 @Validate_Array2D(i8 noundef signext 49, ptr noundef nonnull %4, i32 noundef 6, ptr noundef nonnull %3, ptr noundef %11, i32 noundef %23, ptr noundef %24, i32 noundef 0) #5
  %26 = load i32, ptr %1, align 4, !tbaa !5
  %27 = icmp sgt i32 %26, 0
  br i1 %27, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %0
  call void @free(ptr noundef %11) #5
  %28 = load ptr, ptr %2, align 8, !tbaa !9
  call void @free(ptr noundef %28) #5
  call void @llvm.lifetime.end.p0(i64 48, ptr nonnull %4) #5
  call void @llvm.lifetime.end.p0(i64 24, ptr nonnull %3) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #5
  ret void

.lr.ph:                                           ; preds = %0, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ]
  %29 = getelementptr inbounds ptr, ptr %11, i64 %indvars.iv
  %30 = load ptr, ptr %29, align 8, !tbaa !9
  call void @free(ptr noundef %30) #5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %31 = load i32, ptr %1, align 4, !tbaa !5
  %32 = sext i32 %31 to i64
  %33 = icmp slt i64 %indvars.iv.next, %32
  br i1 %33, label %.lr.ph, label %._crit_edge, !llvm.loop !11
}

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

declare ptr @combine(i32 noundef, i32 noundef, ptr noundef, ptr noundef) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #3

declare i32 @Validate_Array2D(i8 noundef signext, ptr noundef, i32 noundef, ptr noundef, ptr noundef, i32 noundef, ptr noundef, i32 noundef) local_unnamed_addr #2

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #4

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

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 nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, 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 #5 = { 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass