; LLVM IR from ahampriyanshu/algo-ds-101 :: Data-Structures/Stack/Infix_to_prefix_postfix.ll (Z3seqc)

; 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 @_Z3seqc(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, 40
  br i1 %6, label %7, label %8

7:                                                ; preds = %1
  store i32 0, ptr %2, align 4
  br label %24

8:                                                ; preds = %1
  %9 = load i8, ptr %3, align 1, !tbaa !5
  %10 = sext i8 %9 to i32
  %11 = icmp eq i32 %10, 45
  br i1 %11, label %12, label %13

12:                                               ; preds = %8
  store i32 1, ptr %2, align 4
  br label %24

13:                                               ; preds = %8
  %14 = load i8, ptr %3, align 1, !tbaa !5
  %15 = sext i8 %14 to i32
  %16 = icmp eq i32 %15, 43
  br i1 %16, label %17, label %18

17:                                               ; preds = %13
  store i32 2, ptr %2, align 4
  br label %24

18:                                               ; preds = %13
  %19 = load i8, ptr %3, align 1, !tbaa !5
  %20 = sext i8 %19 to i32
  %21 = icmp eq i32 %20, 47
  br i1 %21, label %22, label %23

22:                                               ; preds = %18
  store i32 3, ptr %2, align 4
  br label %24

23:                                               ; preds = %18
  store i32 4, ptr %2, align 4
  br label %24

24:                                               ; preds = %23, %22, %17, %12, %7
  %25 = load i32, ptr %2, align 4
  ret i32 %25
}

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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"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"

@switch.table._Z3seqc = private unnamed_addr constant [8 x i32] [i32 0, i32 4, i32 4, i32 2, i32 4, i32 1, i32 4, i32 3], align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef range(i32 0, 5) i32 @_Z3seqc(i8 noundef signext %0) local_unnamed_addr #0 {
  %switch.tableidx = add i8 %0, -40
  %2 = icmp ult i8 %switch.tableidx, 8
  br i1 %2, label %switch.lookup, label %4

switch.lookup:                                    ; preds = %1
  %3 = zext nneg i8 %switch.tableidx to i64
  %switch.gep = getelementptr inbounds [8 x i32], ptr @switch.table._Z3seqc, i64 0, i64 %3
  %switch.load = load i32, ptr %switch.gep, align 4
  br label %4

4:                                                ; preds = %1, %switch.lookup
  %.0 = phi i32 [ %switch.load, %switch.lookup ], [ 4, %1 ]
  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: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass