; LLVM IR from chirag-singhal/Coding-Interview-101 :: Miscellaneous/Labs/Lab3 (multiQ)

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

6:                                                ; preds = %20, %1
  %7 = load i32, ptr %4, align 4, !tbaa !9
  %8 = icmp slt i32 %7, 10
  br i1 %8, label %10, label %9

9:                                                ; preds = %6
  store i32 2, ptr %5, align 4
  br label %23

10:                                               ; preds = %6
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = load i32, ptr %4, align 4, !tbaa !9
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds ptr, ptr %11, i64 %13
  %15 = load ptr, ptr %14, align 8, !tbaa !5
  %16 = call i32 @isEmpty(ptr noundef %15)
  %17 = icmp ne i32 %16, 0
  br i1 %17, label %19, label %18

18:                                               ; preds = %10
  store i32 0, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %23

19:                                               ; preds = %10
  br label %20

20:                                               ; preds = %19
  %21 = load i32, ptr %4, align 4, !tbaa !9
  %22 = add nsw i32 %21, 1
  store i32 %22, ptr %4, align 4, !tbaa !9
  br label %6, !llvm.loop !11

23:                                               ; preds = %18, %9
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  %24 = load i32, ptr %5, align 4
  switch i32 %24, label %28 [
    i32 2, label %25
    i32 1, label %26
  ]

25:                                               ; preds = %23
  store i32 1, ptr %2, align 4
  br label %26

26:                                               ; preds = %25, %23
  %27 = load i32, ptr %2, align 4
  ret i32 %27

28:                                               ; preds = %23
  unreachable
}

declare i32 @isEmpty(ptr noundef) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = { "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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !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"

; Function Attrs: nounwind uwtable
define dso_local range(i32 0, 2) i32 @isEmptyMQ(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = load ptr, ptr %0, align 8, !tbaa !5
  %3 = tail call i32 @isEmpty(ptr noundef %2) #2
  %.not = icmp eq i32 %3, 0
  br i1 %.not, label %40, label %4

4:                                                ; preds = %1
  %5 = getelementptr inbounds i8, ptr %0, i64 8
  %6 = load ptr, ptr %5, align 8, !tbaa !5
  %7 = tail call i32 @isEmpty(ptr noundef %6) #2
  %.not.1 = icmp eq i32 %7, 0
  br i1 %.not.1, label %40, label %8

8:                                                ; preds = %4
  %9 = getelementptr inbounds i8, ptr %0, i64 16
  %10 = load ptr, ptr %9, align 8, !tbaa !5
  %11 = tail call i32 @isEmpty(ptr noundef %10) #2
  %.not.2 = icmp eq i32 %11, 0
  br i1 %.not.2, label %40, label %12

12:                                               ; preds = %8
  %13 = getelementptr inbounds i8, ptr %0, i64 24
  %14 = load ptr, ptr %13, align 8, !tbaa !5
  %15 = tail call i32 @isEmpty(ptr noundef %14) #2
  %.not.3 = icmp eq i32 %15, 0
  br i1 %.not.3, label %40, label %16

16:                                               ; preds = %12
  %17 = getelementptr inbounds i8, ptr %0, i64 32
  %18 = load ptr, ptr %17, align 8, !tbaa !5
  %19 = tail call i32 @isEmpty(ptr noundef %18) #2
  %.not.4 = icmp eq i32 %19, 0
  br i1 %.not.4, label %40, label %20

20:                                               ; preds = %16
  %21 = getelementptr inbounds i8, ptr %0, i64 40
  %22 = load ptr, ptr %21, align 8, !tbaa !5
  %23 = tail call i32 @isEmpty(ptr noundef %22) #2
  %.not.5 = icmp eq i32 %23, 0
  br i1 %.not.5, label %40, label %24

24:                                               ; preds = %20
  %25 = getelementptr inbounds i8, ptr %0, i64 48
  %26 = load ptr, ptr %25, align 8, !tbaa !5
  %27 = tail call i32 @isEmpty(ptr noundef %26) #2
  %.not.6 = icmp eq i32 %27, 0
  br i1 %.not.6, label %40, label %28

28:                                               ; preds = %24
  %29 = getelementptr inbounds i8, ptr %0, i64 56
  %30 = load ptr, ptr %29, align 8, !tbaa !5
  %31 = tail call i32 @isEmpty(ptr noundef %30) #2
  %.not.7 = icmp eq i32 %31, 0
  br i1 %.not.7, label %40, label %32

32:                                               ; preds = %28
  %33 = getelementptr inbounds i8, ptr %0, i64 64
  %34 = load ptr, ptr %33, align 8, !tbaa !5
  %35 = tail call i32 @isEmpty(ptr noundef %34) #2
  %.not.8 = icmp eq i32 %35, 0
  br i1 %.not.8, label %40, label %36

36:                                               ; preds = %32
  %37 = getelementptr inbounds i8, ptr %0, i64 72
  %38 = load ptr, ptr %37, align 8, !tbaa !5
  %39 = tail call i32 @isEmpty(ptr noundef %38) #2
  %.not.9 = icmp ne i32 %39, 0
  %spec.select = zext i1 %.not.9 to i32
  br label %40

40:                                               ; preds = %36, %32, %28, %24, %20, %16, %12, %8, %4, %1
  %.lcssa = phi i32 [ 0, %1 ], [ 0, %4 ], [ 0, %8 ], [ 0, %12 ], [ 0, %16 ], [ 0, %20 ], [ 0, %24 ], [ 0, %28 ], [ 0, %32 ], [ %spec.select, %36 ]
  ret i32 %.lcssa
}

declare i32 @isEmpty(ptr noundef) local_unnamed_addr #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 = { "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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


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