; LLVM IR from freddiev4/dailyprogrammerchallenges :: Hard Challenges/Challenge 0104 Hard - (Stack Attack)/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 @isAnOperator(i8 noundef signext %0) #0 {
  %2 = alloca i8, align 1
  store i8 %0, ptr %2, align 1, !tbaa !5
  %3 = load i8, ptr %2, align 1, !tbaa !5
  %4 = sext i8 %3 to i32
  %5 = icmp eq i32 %4, 42
  br i1 %5, label %22, label %6

6:                                                ; preds = %1
  %7 = load i8, ptr %2, align 1, !tbaa !5
  %8 = sext i8 %7 to i32
  %9 = icmp eq i32 %8, 45
  br i1 %9, label %22, label %10

10:                                               ; preds = %6
  %11 = load i8, ptr %2, align 1, !tbaa !5
  %12 = sext i8 %11 to i32
  %13 = icmp eq i32 %12, 47
  br i1 %13, label %22, label %14

14:                                               ; preds = %10
  %15 = load i8, ptr %2, align 1, !tbaa !5
  %16 = sext i8 %15 to i32
  %17 = icmp eq i32 %16, 43
  br i1 %17, label %22, label %18

18:                                               ; preds = %14
  %19 = load i8, ptr %2, align 1, !tbaa !5
  %20 = sext i8 %19 to i32
  %21 = icmp eq i32 %20, 94
  br label %22

22:                                               ; preds = %18, %14, %10, %6, %1
  %23 = phi i1 [ true, %14 ], [ true, %10 ], [ true, %6 ], [ true, %1 ], [ %21, %18 ]
  %24 = zext i1 %23 to i32
  ret i32 %24
}

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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local range(i32 0, 2) i32 @isAnOperator(i8 noundef signext %0) local_unnamed_addr #0 {
  %switch.tableidx = add i8 %0, -42
  %2 = icmp ult i8 %switch.tableidx, 6
  br i1 %2, label %switch.hole_check, label %3

3:                                                ; preds = %switch.hole_check, %1
  %4 = icmp eq i8 %0, 94
  %5 = zext i1 %4 to i32
  br label %switch.lookup

switch.hole_check:                                ; preds = %1
  %switch.shifted = lshr i8 43, %switch.tableidx
  %switch.lobit = trunc i8 %switch.shifted to i1
  br i1 %switch.lobit, label %switch.lookup, label %3

switch.lookup:                                    ; preds = %switch.hole_check, %3
  %6 = phi i32 [ %5, %3 ], [ 1, %switch.hole_check ]
  ret i32 %6
}

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