; LLVM IR from freddiev4/dailyprogrammerchallenges :: Easy Challenges/Challenge 0149 Easy - Disemvoweler/solutions (solution)

; 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 i32 @isVowel(i8 noundef signext %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i8, align 1
  store i8 %0, ptr %3, align 1, !tbaa !5
  %4 = load i8, ptr %3, align 1, !tbaa !5
  %5 = sext i8 %4 to i32
  %6 = icmp eq i32 %5, 97
  br i1 %6, label %23, label %7

7:                                                ; preds = %1
  %8 = load i8, ptr %3, align 1, !tbaa !5
  %9 = sext i8 %8 to i32
  %10 = icmp eq i32 %9, 101
  br i1 %10, label %23, label %11

11:                                               ; preds = %7
  %12 = load i8, ptr %3, align 1, !tbaa !5
  %13 = sext i8 %12 to i32
  %14 = icmp eq i32 %13, 105
  br i1 %14, label %23, label %15

15:                                               ; preds = %11
  %16 = load i8, ptr %3, align 1, !tbaa !5
  %17 = sext i8 %16 to i32
  %18 = icmp eq i32 %17, 111
  br i1 %18, label %23, label %19

19:                                               ; preds = %15
  %20 = load i8, ptr %3, align 1, !tbaa !5
  %21 = sext i8 %20 to i32
  %22 = icmp eq i32 %21, 117
  br i1 %22, label %23, label %24

23:                                               ; preds = %19, %15, %11, %7, %1
  store i32 1, ptr %2, align 4
  br label %25

24:                                               ; preds = %19
  store i32 0, ptr %2, align 4
  br label %25

25:                                               ; preds = %24, %23
  %26 = load i32, ptr %2, align 4
  ret i32 %26
}

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" }

!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"}


; 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"

@switch.table.isVowel = private unnamed_addr constant [11 x i32] [i32 1, i32 0, i32 1, i32 0, i32 1, i32 0, i32 0, i32 1, i32 0, i32 0, i32 1], align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local range(i32 0, 2) i32 @isVowel(i8 noundef signext %0) local_unnamed_addr #0 {
  %2 = add i8 %0, -97
  %3 = tail call i8 @llvm.fshl.i8(i8 %2, i8 %2, i8 7)
  %4 = icmp ult i8 %3, 11
  br i1 %4, label %switch.lookup, label %6

switch.lookup:                                    ; preds = %1
  %5 = zext nneg i8 %3 to i64
  %switch.gep = getelementptr inbounds [11 x i32], ptr @switch.table.isVowel, i64 0, i64 %5
  %switch.load = load i32, ptr %switch.gep, align 4
  br label %6

6:                                                ; preds = %1, %switch.lookup
  %.0 = phi i32 [ %switch.load, %switch.lookup ], [ 0, %1 ]
  ret i32 %.0
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i8 @llvm.fshl.i8(i8, i8, i8) #1

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" }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass