; LLVM IR from div-bargali/Data-Structures-and-Algorithms :: C/Data-Structures/Stack (InfixToPrefixConv)

; 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 @checkIfOperand(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 sge i32 %4, 97
  br i1 %5, label %6, label %10

6:                                                ; preds = %1
  %7 = load i8, ptr %2, align 1, !tbaa !5
  %8 = sext i8 %7 to i32
  %9 = icmp sle i32 %8, 122
  br i1 %9, label %20, label %10

10:                                               ; preds = %6, %1
  %11 = load i8, ptr %2, align 1, !tbaa !5
  %12 = sext i8 %11 to i32
  %13 = icmp sge i32 %12, 65
  br i1 %13, label %14, label %18

14:                                               ; preds = %10
  %15 = load i8, ptr %2, align 1, !tbaa !5
  %16 = sext i8 %15 to i32
  %17 = icmp sle i32 %16, 90
  br label %18

18:                                               ; preds = %14, %10
  %19 = phi i1 [ false, %10 ], [ %17, %14 ]
  br label %20

20:                                               ; preds = %18, %6
  %21 = phi i1 [ true, %6 ], [ %19, %18 ]
  %22 = zext i1 %21 to i32
  ret i32 %22
}

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 @checkIfOperand(i8 noundef signext %0) local_unnamed_addr #0 {
  %2 = and i8 %0, -33
  %3 = add i8 %2, -65
  %narrow = icmp ult i8 %3, 26
  %4 = zext i1 %narrow to i32
  ret i32 %4
}

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