; LLVM IR from AdarshGaur/Competitive-Programming :: Hacker Cup/2021/Qualification Round/A1: Consistency - Chapter 1.ll (Z7isVowelc)

; 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"

@vowels = external dso_local global [5 x i8], align 1

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z7isVowelc(i8 noundef signext %0) #0 {
  %2 = alloca i1, align 1
  %3 = alloca i8, align 1
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  store i8 %0, ptr %3, align 1, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  store i64 0, ptr %4, align 8, !tbaa !8
  br label %6

6:                                                ; preds = %20, %1
  %7 = load i64, ptr %4, align 8, !tbaa !8
  %8 = icmp slt i64 %7, 5
  br i1 %8, label %10, label %9

9:                                                ; preds = %6
  store i32 2, ptr %5, align 4
  br label %23

10:                                               ; preds = %6
  %11 = load i8, ptr %3, align 1, !tbaa !5
  %12 = sext i8 %11 to i32
  %13 = load i64, ptr %4, align 8, !tbaa !8
  %14 = getelementptr inbounds [5 x i8], ptr @vowels, i64 0, i64 %13
  %15 = load i8, ptr %14, align 1, !tbaa !5
  %16 = sext i8 %15 to i32
  %17 = icmp eq i32 %12, %16
  br i1 %17, label %18, label %19

18:                                               ; preds = %10
  store i1 true, ptr %2, align 1
  store i32 1, ptr %5, align 4
  br label %23

19:                                               ; preds = %10
  br label %20

20:                                               ; preds = %19
  %21 = load i64, ptr %4, align 8, !tbaa !8
  %22 = add nsw i64 %21, 1
  store i64 %22, ptr %4, align 8, !tbaa !8
  br label %6, !llvm.loop !10

23:                                               ; preds = %18, %9
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %24 = load i32, ptr %5, align 4
  switch i32 %24, label %28 [
    i32 2, label %25
    i32 1, label %26
  ]

25:                                               ; preds = %23
  store i1 false, ptr %2, align 1
  br label %26

26:                                               ; preds = %25, %23
  %27 = load i1, ptr %2, align 1
  ret i1 %27

28:                                               ; preds = %23
  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 = { 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 #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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"long", !6, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"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"

@vowels = external dso_local local_unnamed_addr global [5 x i8], align 1

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef zeroext i1 @_Z7isVowelc(i8 noundef signext %0) local_unnamed_addr #0 {
  %2 = load <4 x i8>, ptr @vowels, align 1
  %3 = insertelement <4 x i8> poison, i8 %0, i64 0
  %4 = shufflevector <4 x i8> %3, <4 x i8> poison, <4 x i32> zeroinitializer
  %5 = icmp eq <4 x i8> %2, %4
  %6 = load i8, ptr getelementptr inbounds (i8, ptr @vowels, i64 4), align 1
  %7 = icmp eq i8 %6, %0
  %8 = freeze <4 x i1> %5
  %9 = bitcast <4 x i1> %8 to i4
  %10 = icmp ne i4 %9, 0
  %op.rdx = select i1 %10, i1 true, i1 %7
  ret i1 %op.rdx
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, 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)"}


; Effective O3 passes: CorrelatedValuePropagationPass,GVNPass,GlobalDCEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LCSSAPass,LoopRotatePass,PostOrderFunctionAttrsPass,SLPVectorizerPass,SROAPass,SimplifyCFGPass