; LLVM IR from ros2/rcutils :: src (find)

; 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: nounwind uwtable
define dso_local i64 @rcutils_findn(ptr noundef %0, i8 noundef signext %1, i64 noundef %2) #0 {
  %4 = alloca i64, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i8, align 1
  %7 = alloca i64, align 8
  %8 = alloca i64, align 8
  %9 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i8 %1, ptr %6, align 1, !tbaa !9
  store i64 %2, ptr %7, align 8, !tbaa !10
  %10 = load ptr, ptr %5, align 8, !tbaa !5
  %11 = icmp eq ptr null, %10
  br i1 %11, label %15, label %12

12:                                               ; preds = %3
  %13 = load i64, ptr %7, align 8, !tbaa !10
  %14 = icmp eq i64 0, %13
  br i1 %14, label %15, label %16

15:                                               ; preds = %12, %3
  store i64 -1, ptr %4, align 8
  br label %40

16:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  store i64 0, ptr %8, align 8, !tbaa !10
  br label %17

17:                                               ; preds = %34, %16
  %18 = load i64, ptr %8, align 8, !tbaa !10
  %19 = load i64, ptr %7, align 8, !tbaa !10
  %20 = icmp ult i64 %18, %19
  br i1 %20, label %22, label %21

21:                                               ; preds = %17
  store i32 2, ptr %9, align 4
  br label %37

22:                                               ; preds = %17
  %23 = load ptr, ptr %5, align 8, !tbaa !5
  %24 = load i64, ptr %8, align 8, !tbaa !10
  %25 = getelementptr inbounds i8, ptr %23, i64 %24
  %26 = load i8, ptr %25, align 1, !tbaa !9
  %27 = sext i8 %26 to i32
  %28 = load i8, ptr %6, align 1, !tbaa !9
  %29 = sext i8 %28 to i32
  %30 = icmp eq i32 %27, %29
  br i1 %30, label %31, label %33

31:                                               ; preds = %22
  %32 = load i64, ptr %8, align 8, !tbaa !10
  store i64 %32, ptr %4, align 8
  store i32 1, ptr %9, align 4
  br label %37

33:                                               ; preds = %22
  br label %34

34:                                               ; preds = %33
  %35 = load i64, ptr %8, align 8, !tbaa !10
  %36 = add i64 %35, 1
  store i64 %36, ptr %8, align 8, !tbaa !10
  br label %17, !llvm.loop !12

37:                                               ; preds = %31, %21
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  %38 = load i32, ptr %9, align 4
  switch i32 %38, label %42 [
    i32 2, label %39
    i32 1, label %40
  ]

39:                                               ; preds = %37
  store i64 -1, ptr %4, align 8
  br label %40

40:                                               ; preds = %39, %37, %15
  %41 = load i64, ptr %4, align 8
  ret i64 %41

42:                                               ; preds = %37
  unreachable
}

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

; 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 }

!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 = !{!7, !7, i64 0}
!10 = !{!11, !11, i64 0}
!11 = !{!"long", !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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: nofree norecurse nosync nounwind memory(argmem: read) uwtable
define dso_local i64 @rcutils_findn(ptr noundef readonly %0, i8 noundef signext %1, i64 noundef %2) local_unnamed_addr #0 {
  %4 = icmp eq ptr %0, null
  %5 = icmp eq i64 %2, 0
  %or.cond = or i1 %4, %5
  br i1 %or.cond, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %3, %9
  %.01115 = phi i64 [ %10, %9 ], [ 0, %3 ]
  %6 = getelementptr inbounds i8, ptr %0, i64 %.01115
  %7 = load i8, ptr %6, align 1, !tbaa !5
  %8 = icmp eq i8 %7, %1
  br i1 %8, label %.loopexit, label %9

9:                                                ; preds = %.preheader
  %10 = add nuw i64 %.01115, 1
  %exitcond.not = icmp eq i64 %10, %2
  br i1 %exitcond.not, label %.loopexit, label %.preheader, !llvm.loop !8

.loopexit:                                        ; preds = %9, %.preheader, %3
  %.1 = phi i64 [ -1, %3 ], [ %.01115, %.preheader ], [ -1, %9 ]
  ret i64 %.1
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: read) 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


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