; LLVM IR from CubbyFlow/RenderFlow :: Extensions/FlowEditor/sample_utils/file_png.ll (Z20getValueRequiredBitst)

; 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: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z20getValueRequiredBitst(i16 noundef zeroext %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i16, align 2
  store i16 %0, ptr %3, align 2, !tbaa !5
  %4 = load i16, ptr %3, align 2, !tbaa !5
  %5 = zext i16 %4 to i32
  %6 = icmp eq i32 %5, 0
  br i1 %6, label %11, label %7

7:                                                ; preds = %1
  %8 = load i16, ptr %3, align 2, !tbaa !5
  %9 = zext i16 %8 to i32
  %10 = icmp eq i32 %9, 255
  br i1 %10, label %11, label %12

11:                                               ; preds = %7, %1
  store i32 1, ptr %2, align 4
  br label %25

12:                                               ; preds = %7
  %13 = load i16, ptr %3, align 2, !tbaa !5
  %14 = zext i16 %13 to i32
  %15 = srem i32 %14, 17
  %16 = icmp eq i32 %15, 0
  br i1 %16, label %17, label %24

17:                                               ; preds = %12
  %18 = load i16, ptr %3, align 2, !tbaa !5
  %19 = zext i16 %18 to i32
  %20 = srem i32 %19, 85
  %21 = icmp eq i32 %20, 0
  %22 = zext i1 %21 to i64
  %23 = select i1 %21, i32 2, i32 4
  store i32 %23, ptr %2, align 4
  br label %25

24:                                               ; preds = %12
  store i32 8, ptr %2, align 4
  br label %25

25:                                               ; preds = %24, %17, %11
  %26 = load i32, ptr %2, align 4
  ret i32 %26
}

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 = !{!"short", !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 range(i32 1, 9) i32 @_Z20getValueRequiredBitst(i16 noundef zeroext %0) local_unnamed_addr #0 {
  switch i16 %0, label %2 [
    i16 255, label %9
    i16 0, label %9
  ]

2:                                                ; preds = %1
  %3 = urem i16 %0, 17
  %4 = icmp eq i16 %3, 0
  br i1 %4, label %5, label %9

5:                                                ; preds = %2
  %6 = urem i16 %0, 85
  %7 = icmp eq i16 %6, 0
  %8 = select i1 %7, i32 2, i32 4
  br label %9

9:                                                ; preds = %2, %1, %1, %5
  %.0 = phi i32 [ %8, %5 ], [ 1, %1 ], [ 1, %1 ], [ 8, %2 ]
  ret i32 %.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,EarlyCSEPass,GlobalOptPass,IPSCCPPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass