; LLVM IR from venumb/ZSPACE :: cpp/depends/lodePNG/pngdetail.ll (Z17lightnessToLetteri)

; 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: 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 signext i8 @_Z17lightnessToLetteri(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 32, ptr %3, align 4, !tbaa !5
  %4 = load i32, ptr %2, align 4, !tbaa !5
  %5 = icmp slt i32 %4, 16
  br i1 %5, label %6, label %7

6:                                                ; preds = %1
  store i32 32, ptr %3, align 4, !tbaa !5
  br label %43

7:                                                ; preds = %1
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = icmp slt i32 %8, 48
  br i1 %9, label %10, label %11

10:                                               ; preds = %7
  store i32 46, ptr %3, align 4, !tbaa !5
  br label %42

11:                                               ; preds = %7
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = icmp slt i32 %12, 80
  br i1 %13, label %14, label %15

14:                                               ; preds = %11
  store i32 58, ptr %3, align 4, !tbaa !5
  br label %41

15:                                               ; preds = %11
  %16 = load i32, ptr %2, align 4, !tbaa !5
  %17 = icmp slt i32 %16, 112
  br i1 %17, label %18, label %19

18:                                               ; preds = %15
  store i32 45, ptr %3, align 4, !tbaa !5
  br label %40

19:                                               ; preds = %15
  %20 = load i32, ptr %2, align 4, !tbaa !5
  %21 = icmp slt i32 %20, 144
  br i1 %21, label %22, label %23

22:                                               ; preds = %19
  store i32 33, ptr %3, align 4, !tbaa !5
  br label %39

23:                                               ; preds = %19
  %24 = load i32, ptr %2, align 4, !tbaa !5
  %25 = icmp slt i32 %24, 176
  br i1 %25, label %26, label %27

26:                                               ; preds = %23
  store i32 42, ptr %3, align 4, !tbaa !5
  br label %38

27:                                               ; preds = %23
  %28 = load i32, ptr %2, align 4, !tbaa !5
  %29 = icmp slt i32 %28, 208
  br i1 %29, label %30, label %31

30:                                               ; preds = %27
  store i32 43, ptr %3, align 4, !tbaa !5
  br label %37

31:                                               ; preds = %27
  %32 = load i32, ptr %2, align 4, !tbaa !5
  %33 = icmp slt i32 %32, 240
  br i1 %33, label %34, label %35

34:                                               ; preds = %31
  store i32 61, ptr %3, align 4, !tbaa !5
  br label %36

35:                                               ; preds = %31
  store i32 35, ptr %3, align 4, !tbaa !5
  br label %36

36:                                               ; preds = %35, %34
  br label %37

37:                                               ; preds = %36, %30
  br label %38

38:                                               ; preds = %37, %26
  br label %39

39:                                               ; preds = %38, %22
  br label %40

40:                                               ; preds = %39, %18
  br label %41

41:                                               ; preds = %40, %14
  br label %42

42:                                               ; preds = %41, %10
  br label %43

43:                                               ; preds = %42, %6
  %44 = load i32, ptr %3, align 4, !tbaa !5
  %45 = trunc i32 %44 to i8
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i8 %45
}

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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


; 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 noundef signext range(i8 32, 62) i8 @_Z17lightnessToLetteri(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp slt i32 %0, 16
  br i1 %2, label %17, label %3

3:                                                ; preds = %1
  %4 = icmp ult i32 %0, 48
  br i1 %4, label %17, label %5

5:                                                ; preds = %3
  %6 = icmp ult i32 %0, 80
  br i1 %6, label %17, label %7

7:                                                ; preds = %5
  %8 = icmp ult i32 %0, 112
  br i1 %8, label %17, label %9

9:                                                ; preds = %7
  %10 = icmp ult i32 %0, 144
  br i1 %10, label %17, label %11

11:                                               ; preds = %9
  %12 = icmp ult i32 %0, 176
  br i1 %12, label %17, label %13

13:                                               ; preds = %11
  %14 = icmp ult i32 %0, 208
  br i1 %14, label %17, label %15

15:                                               ; preds = %13
  %16 = icmp ult i32 %0, 240
  %. = select i1 %16, i8 61, i8 35
  br label %17

17:                                               ; preds = %15, %13, %11, %9, %7, %5, %3, %1
  %.0 = phi i8 [ 32, %1 ], [ 46, %3 ], [ 58, %5 ], [ 45, %7 ], [ 33, %9 ], [ 42, %11 ], [ 43, %13 ], [ %., %15 ]
  ret i8 %.0
}

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: CorrelatedValuePropagationPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass