; LLVM IR from lekkas/c-algorithms :: src/algos (DoubleList)

; 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.DoubleList = type { ptr, ptr, %struct.DataOps }
%struct.DataOps = type { ptr, ptr }
%struct.DoubleListNode = type { ptr, ptr, ptr }

; 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 ptr @searchDoubleListNode(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.DoubleList, ptr %8, i32 0, i32 0
  %10 = load ptr, ptr %9, align 8, !tbaa !9
  store ptr %10, ptr %6, align 8, !tbaa !5
  br label %11

11:                                               ; preds = %27, %2
  %12 = load ptr, ptr %6, align 8, !tbaa !5
  %13 = icmp ne ptr %12, null
  br i1 %13, label %14, label %31

14:                                               ; preds = %11
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.DoubleList, ptr %15, i32 0, i32 2
  %17 = getelementptr inbounds %struct.DataOps, ptr %16, i32 0, i32 0
  %18 = load ptr, ptr %17, align 8, !tbaa !12
  %19 = load ptr, ptr %6, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.DoubleListNode, ptr %19, i32 0, i32 0
  %21 = load ptr, ptr %20, align 8, !tbaa !13
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = call i32 %18(ptr noundef %21, ptr noundef %22)
  %24 = icmp ne i32 %23, 0
  br i1 %24, label %27, label %25

25:                                               ; preds = %14
  %26 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %26, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %32

27:                                               ; preds = %14
  %28 = load ptr, ptr %6, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.DoubleListNode, ptr %28, i32 0, i32 1
  %30 = load ptr, ptr %29, align 8, !tbaa !15
  store ptr %30, ptr %6, align 8, !tbaa !5
  br label %11, !llvm.loop !16

31:                                               ; preds = %11
  store ptr null, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %32

32:                                               ; preds = %31, %25
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  %33 = load ptr, ptr %3, align 8
  ret ptr %33
}

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 = { 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, !6, i64 0}
!10 = !{!"DoubleList", !6, i64 0, !6, i64 8, !11, i64 16}
!11 = !{!"DataOps", !6, i64 0, !6, i64 8}
!12 = !{!10, !6, i64 16}
!13 = !{!14, !6, i64 0}
!14 = !{!"DoubleListNode", !6, i64 0, !6, i64 8, !6, i64 16}
!15 = !{!14, !6, i64 8}
!16 = distinct !{!16, !17}
!17 = !{!"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 noundef ptr @searchDoubleListNode(ptr nocapture noundef readonly %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = getelementptr inbounds i8, ptr %0, i64 16
  %.010 = load ptr, ptr %0, align 8, !tbaa !5
  %.not11 = icmp eq ptr %.010, null
  br i1 %.not11, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %7
  %.012 = phi ptr [ %.0, %7 ], [ %.010, %2 ]
  %4 = load ptr, ptr %3, align 8, !tbaa !9
  %5 = load ptr, ptr %.012, align 8, !tbaa !12
  %6 = tail call i32 %4(ptr noundef %5, ptr noundef %1) #1
  %.not9 = icmp eq i32 %6, 0
  br i1 %.not9, label %._crit_edge, label %7

7:                                                ; preds = %.lr.ph
  %8 = getelementptr inbounds i8, ptr %.012, i64 8
  %.0 = load ptr, ptr %8, align 8, !tbaa !5
  %.not = icmp eq ptr %.0, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !14

._crit_edge:                                      ; preds = %.lr.ph, %7, %2
  %.0.lcssa = phi ptr [ null, %2 ], [ null, %7 ], [ %.012, %.lr.ph ]
  ret ptr %.0.lcssa
}

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 = { 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, !6, i64 16}
!10 = !{!"DoubleList", !6, i64 0, !6, i64 8, !11, i64 16}
!11 = !{!"DataOps", !6, i64 0, !6, i64 8}
!12 = !{!13, !6, i64 0}
!13 = !{!"DoubleListNode", !6, i64 0, !6, i64 8, !6, i64 16}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


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