; LLVM IR from JessonYue/LeetCodeLearning :: Array/xietao/第一周作业/FIFO (FIFOList)

; 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"

%struct._Node = type { i32, i32, ptr }
%struct.FIFO = type { ptr, i32 }

; Function Attrs: nounwind uwtable
define dso_local ptr @initQueue() #0 {
  %1 = alloca ptr, align 8
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #4
  %5 = call noalias ptr @malloc(i64 noundef 16) #5
  store ptr %5, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #4
  %6 = call noalias ptr @malloc(i64 noundef 16) #5
  store ptr %6, ptr %3, align 8, !tbaa !5
  %7 = load ptr, ptr %2, align 8, !tbaa !5
  %8 = icmp eq ptr %7, null
  br i1 %8, label %12, label %9

9:                                                ; preds = %0
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  %11 = icmp ne ptr %10, null
  br i1 %11, label %12, label %13

12:                                               ; preds = %9, %0
  store ptr null, ptr %1, align 8
  store i32 1, ptr %4, align 4
  br label %28

13:                                               ; preds = %9
  %14 = load ptr, ptr %2, align 8, !tbaa !5
  call void @llvm.memset.p0.i64(ptr align 8 %14, i8 0, i64 16, i1 false)
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  call void @llvm.memset.p0.i64(ptr align 8 %15, i8 0, i64 16, i1 false)
  %16 = load ptr, ptr %3, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct._Node, ptr %16, i32 0, i32 1
  store i32 -1, ptr %17, align 4, !tbaa !9
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct._Node, ptr %18, i32 0, i32 0
  store i32 0, ptr %19, align 8, !tbaa !12
  %20 = load ptr, ptr %3, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct._Node, ptr %20, i32 0, i32 2
  store ptr null, ptr %21, align 8, !tbaa !13
  %22 = load ptr, ptr %2, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.FIFO, ptr %22, i32 0, i32 1
  store i32 0, ptr %23, align 8, !tbaa !14
  %24 = load ptr, ptr %3, align 8, !tbaa !5
  %25 = load ptr, ptr %2, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.FIFO, ptr %25, i32 0, i32 0
  store ptr %24, ptr %26, align 8, !tbaa !16
  %27 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %27, ptr %1, align 8
  store i32 1, ptr %4, align 4
  br label %28

28:                                               ; preds = %13, %12
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #4
  %29 = load ptr, ptr %1, align 8
  ret ptr %29
}

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

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

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #3

; 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 = { 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 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #4 = { nounwind }
attributes #5 = { nounwind allocsize(0) }

!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, !11, i64 4}
!10 = !{!"_Node", !11, i64 0, !11, i64 4, !6, i64 8}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !11, i64 0}
!13 = !{!10, !6, i64 8}
!14 = !{!15, !11, i64 8}
!15 = !{!"FIFO", !6, i64 0, !11, i64 8}
!16 = !{!15, !6, i64 0}


; 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 nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noalias noundef ptr @initQueue() local_unnamed_addr #0 {
  ret ptr null
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(none) 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" }

!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)"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass