; LLVM IR from HarshCasper/NeoAlgo :: C/ds (prefix-to-postfix)

; 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"

%struct.stack = type { [20 x [20 x i8]], i32 }

@s = external dso_local global %struct.stack, align 4

; Function Attrs: nounwind uwtable
define dso_local void @push(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %3 = load i32, ptr getelementptr inbounds (%struct.stack, ptr @s, i32 0, i32 1), align 4, !tbaa !9
  %4 = icmp eq i32 %3, 20
  br i1 %4, label %5, label %6

5:                                                ; preds = %1
  br label %15

6:                                                ; preds = %1
  %7 = load i32, ptr getelementptr inbounds (%struct.stack, ptr @s, i32 0, i32 1), align 4, !tbaa !9
  %8 = add nsw i32 %7, 1
  store i32 %8, ptr getelementptr inbounds (%struct.stack, ptr @s, i32 0, i32 1), align 4, !tbaa !9
  %9 = load i32, ptr getelementptr inbounds (%struct.stack, ptr @s, i32 0, i32 1), align 4, !tbaa !9
  %10 = sext i32 %9 to i64
  %11 = getelementptr inbounds [20 x [20 x i8]], ptr @s, i64 0, i64 %10
  %12 = getelementptr inbounds [20 x i8], ptr %11, i64 0, i64 0
  %13 = load ptr, ptr %2, align 8, !tbaa !5
  %14 = call ptr @strcpy(ptr noundef %12, ptr noundef %13) #2
  br label %15

15:                                               ; preds = %6, %5
  ret void
}

; Function Attrs: nounwind
declare ptr @strcpy(ptr noundef, ptr noundef) #1

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" }
attributes #1 = { nounwind "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 #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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !11, i64 400}
!10 = !{!"", !7, i64 0, !11, i64 400}
!11 = !{!"int", !7, i64 0}


; 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"

%struct.stack = type { [20 x [20 x i8]], i32 }

@s = external dso_local global %struct.stack, align 4

; Function Attrs: mustprogress nofree nounwind willreturn memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @push(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = load i32, ptr getelementptr inbounds (i8, ptr @s, i64 400), align 4, !tbaa !5
  %3 = icmp eq i32 %2, 20
  br i1 %3, label %9, label %4

4:                                                ; preds = %1
  %5 = add nsw i32 %2, 1
  store i32 %5, ptr getelementptr inbounds (i8, ptr @s, i64 400), align 4, !tbaa !5
  %6 = sext i32 %5 to i64
  %7 = getelementptr inbounds [20 x [20 x i8]], ptr @s, i64 0, i64 %6
  %8 = tail call ptr @strcpy(ptr noundef nonnull dereferenceable(1) %7, ptr noundef nonnull dereferenceable(1) %0) #2
  br label %9

9:                                                ; preds = %1, %4
  ret void
}

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: readwrite)
declare ptr @strcpy(ptr noalias noundef returned writeonly, ptr noalias nocapture noundef readonly) local_unnamed_addr #1

attributes #0 = { mustprogress nofree nounwind willreturn memory(readwrite, 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" }
attributes #1 = { mustprogress nofree nounwind willreturn memory(argmem: readwrite) "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 #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, !9, i64 400}
!6 = !{!"", !7, i64 0, !9, i64 400}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!"int", !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass