; LLVM IR from sunkafei/xcpc-algorithm-templates :: 算法/数据结构/Treap.ll (Z4findP4nodei)

; 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 { [2 x ptr], i32, i32, i32 }

@nil = external dso_local global ptr, align 8

; 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: mustprogress uwtable
define dso_local noundef ptr @_Z4findP4nodei(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  br label %8

8:                                                ; preds = %30, %2
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = load ptr, ptr @nil, align 8, !tbaa !5
  %11 = icmp ne ptr %9, %10
  br i1 %11, label %12, label %31

12:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = load i32, ptr %5, align 4, !tbaa !9
  %15 = call noundef i32 @_ZNK4node3cmpEi(ptr noundef nonnull align 8 dereferenceable(32) %13, i32 noundef %14)
  store i32 %15, ptr %6, align 4, !tbaa !9
  %16 = load i32, ptr %6, align 4, !tbaa !9
  %17 = icmp eq i32 %16, -1
  br i1 %17, label %18, label %20

18:                                               ; preds = %12
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %19, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %28

20:                                               ; preds = %12
  %21 = load ptr, ptr %4, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.node, ptr %21, i32 0, i32 0
  %23 = load i32, ptr %6, align 4, !tbaa !9
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [2 x ptr], ptr %22, i64 0, i64 %24
  %26 = load ptr, ptr %25, align 8, !tbaa !5
  store ptr %26, ptr %4, align 8, !tbaa !5
  br label %27

27:                                               ; preds = %20
  store i32 0, ptr %7, align 4
  br label %28

28:                                               ; preds = %27, %18
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  %29 = load i32, ptr %7, align 4
  switch i32 %29, label %35 [
    i32 0, label %30
    i32 1, label %33
  ]

30:                                               ; preds = %28
  br label %8, !llvm.loop !11

31:                                               ; preds = %8
  %32 = load ptr, ptr @nil, align 8, !tbaa !5
  store ptr %32, ptr %3, align 8
  br label %33

33:                                               ; preds = %31, %28
  %34 = load ptr, ptr %3, align 8
  ret ptr %34

35:                                               ; preds = %28
  unreachable
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_ZNK4node3cmpEi(ptr noundef nonnull align 8 dereferenceable(32), i32 noundef) #2 align 2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { 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"}


; 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"

@nil = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef ptr @_Z4findP4nodei(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = load ptr, ptr @nil, align 8, !tbaa !5
  %.not16 = icmp eq ptr %3, %0
  br i1 %.not16, label %.thread, label %.lr.ph

.lr.ph:                                           ; preds = %2, %6
  %.0917 = phi ptr [ %9, %6 ], [ %0, %2 ]
  %4 = tail call noundef i32 @_ZNK4node3cmpEi(ptr noundef nonnull align 8 dereferenceable(32) %.0917, i32 noundef %1)
  %5 = icmp eq i32 %4, -1
  br i1 %5, label %.thread, label %6

6:                                                ; preds = %.lr.ph
  %7 = sext i32 %4 to i64
  %8 = getelementptr inbounds [2 x ptr], ptr %.0917, i64 0, i64 %7
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %10 = load ptr, ptr @nil, align 8, !tbaa !5
  %.not = icmp eq ptr %9, %10
  br i1 %.not, label %.thread, label %.lr.ph

.thread:                                          ; preds = %6, %.lr.ph, %2
  %.2 = phi ptr [ %3, %2 ], [ %.0917, %.lr.ph ], [ %10, %6 ]
  ret ptr %.2
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i32 @_ZNK4node3cmpEi(ptr noundef nonnull align 8 dereferenceable(32), i32 noundef) local_unnamed_addr #0 align 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" }

!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"}


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