; LLVM IR from gzc/CLRS :: C10-Elementary-Data-Structures/exercise_code/dict.ll (Z6searchP6list_ti)

; 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.list_t = type { %struct.node_t }
%struct.node_t = type { i32, 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: mustprogress nounwind uwtable
define dso_local noundef ptr @_Z6searchP6list_ti(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.list_t, ptr %8, i32 0, i32 0
  %10 = getelementptr inbounds %struct.node_t, ptr %9, i32 0, i32 1
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  store ptr %11, ptr %6, align 8, !tbaa !5
  %12 = load i32, ptr %5, align 4, !tbaa !9
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.list_t, ptr %13, i32 0, i32 0
  %15 = getelementptr inbounds %struct.node_t, ptr %14, i32 0, i32 0
  store i32 %12, ptr %15, align 8, !tbaa !14
  br label %16

16:                                               ; preds = %22, %2
  %17 = load ptr, ptr %6, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.node_t, ptr %17, i32 0, i32 0
  %19 = load i32, ptr %18, align 8, !tbaa !15
  %20 = load i32, ptr %5, align 4, !tbaa !9
  %21 = icmp ne i32 %19, %20
  br i1 %21, label %22, label %26

22:                                               ; preds = %16
  %23 = load ptr, ptr %6, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.node_t, ptr %23, i32 0, i32 1
  %25 = load ptr, ptr %24, align 8, !tbaa !16
  store ptr %25, ptr %6, align 8, !tbaa !5
  br label %16, !llvm.loop !17

26:                                               ; preds = %16
  %27 = load ptr, ptr %6, align 8, !tbaa !5
  %28 = load ptr, ptr %4, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.list_t, ptr %28, i32 0, i32 0
  %30 = icmp eq ptr %27, %29
  br i1 %30, label %31, label %32

31:                                               ; preds = %26
  store ptr null, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %34

32:                                               ; preds = %26
  %33 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %33, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %34

34:                                               ; preds = %32, %31
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  %35 = load ptr, ptr %3, align 8
  ret ptr %35
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 8}
!12 = !{!"_ZTS6list_t", !13, i64 0}
!13 = !{!"_ZTS6node_t", !10, i64 0, !6, i64 8}
!14 = !{!12, !10, i64 0}
!15 = !{!13, !10, i64 0}
!16 = !{!13, !6, i64 8}
!17 = distinct !{!17, !18}
!18 = !{!"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: mustprogress nofree norecurse nosync nounwind memory(read, argmem: readwrite, inaccessiblemem: none) uwtable
define dso_local noundef ptr @_Z6searchP6list_ti(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = getelementptr inbounds i8, ptr %0, i64 8
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %0, align 8, !tbaa !12
  %5 = load i32, ptr %4, align 8, !tbaa !13
  %.not10 = icmp eq i32 %5, %1
  br i1 %.not10, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %.lr.ph
  %.011 = phi ptr [ %7, %.lr.ph ], [ %4, %2 ]
  %6 = getelementptr inbounds i8, ptr %.011, i64 8
  %7 = load ptr, ptr %6, align 8, !tbaa !14
  %8 = load i32, ptr %7, align 8, !tbaa !13
  %.not = icmp eq i32 %8, %1
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !15

._crit_edge:                                      ; preds = %.lr.ph, %2
  %.0.lcssa = phi ptr [ %4, %2 ], [ %7, %.lr.ph ]
  %9 = icmp eq ptr %.0.lcssa, %0
  %..0 = select i1 %9, ptr null, ptr %.0.lcssa
  ret ptr %..0
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(read, argmem: readwrite, inaccessiblemem: 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)"}
!5 = !{!6, !11, i64 8}
!6 = !{!"_ZTS6list_t", !7, i64 0}
!7 = !{!"_ZTS6node_t", !8, i64 0, !11, i64 8}
!8 = !{!"int", !9, i64 0}
!9 = !{!"omnipotent char", !10, i64 0}
!10 = !{!"Simple C++ TBAA"}
!11 = !{!"any pointer", !9, i64 0}
!12 = !{!6, !8, i64 0}
!13 = !{!7, !8, i64 0}
!14 = !{!7, !11, i64 8}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}


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