; LLVM IR from codemistic/Data-Structures-and-Algorithms :: Stack (stack_implementation_using_array)

; 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 { i32, i32, ptr }

@.str.6 = external hidden unnamed_addr constant [16 x i8], align 1

declare i32 @printf(ptr noundef, ...) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @peek(i64 %0, ptr %1, i32 noundef %2) #2 {
  %4 = alloca %struct.Stack, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = getelementptr inbounds { i64, ptr }, ptr %4, i32 0, i32 0
  store i64 %0, ptr %7, align 8
  %8 = getelementptr inbounds { i64, ptr }, ptr %4, i32 0, i32 1
  store ptr %1, ptr %8, align 8
  store i32 %2, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 -1, ptr %6, align 4, !tbaa !5
  %9 = getelementptr inbounds %struct.Stack, ptr %4, i32 0, i32 1
  %10 = load i32, ptr %9, align 4, !tbaa !9
  %11 = load i32, ptr %5, align 4, !tbaa !5
  %12 = sub nsw i32 %10, %11
  %13 = add nsw i32 %12, 1
  %14 = icmp slt i32 %13, 0
  br i1 %14, label %15, label %17

15:                                               ; preds = %3
  %16 = call i32 (ptr, ...) @printf(ptr noundef @.str.6)
  br label %17

17:                                               ; preds = %15, %3
  %18 = getelementptr inbounds %struct.Stack, ptr %4, i32 0, i32 2
  %19 = load ptr, ptr %18, align 8, !tbaa !12
  %20 = getelementptr inbounds %struct.Stack, ptr %4, i32 0, i32 1
  %21 = load i32, ptr %20, align 4, !tbaa !9
  %22 = load i32, ptr %5, align 4, !tbaa !5
  %23 = sub nsw i32 %21, %22
  %24 = add nsw i32 %23, 1
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds i32, ptr %19, i64 %25
  %27 = load i32, ptr %26, align 4, !tbaa !5
  store i32 %27, ptr %6, align 4, !tbaa !5
  %28 = load i32, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  ret i32 %28
}

attributes #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 willreturn memory(argmem: readwrite) }
attributes #2 = { 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 #3 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !6, i64 4}
!10 = !{!"Stack", !6, i64 0, !6, i64 4, !11, i64 8}
!11 = !{!"any pointer", !7, i64 0}
!12 = !{!10, !11, i64 8}


; 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"

@.str.6 = external hidden unnamed_addr constant [16 x i8], align 1

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #0

; Function Attrs: nofree nounwind uwtable
define dso_local i32 @peek(i64 %0, ptr nocapture readonly %1, i32 noundef %2) local_unnamed_addr #1 {
  %.sroa.1.0.extract.shift = lshr i64 %0, 32
  %.sroa.1.0.extract.trunc = trunc nuw i64 %.sroa.1.0.extract.shift to i32
  %4 = sub nsw i32 %.sroa.1.0.extract.trunc, %2
  %5 = icmp slt i32 %4, -1
  br i1 %5, label %6, label %8

6:                                                ; preds = %3
  %7 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.6)
  br label %8

8:                                                ; preds = %6, %3
  %9 = sext i32 %4 to i64
  %10 = getelementptr i32, ptr %1, i64 %9
  %11 = getelementptr i8, ptr %10, i64 4
  %12 = load i32, ptr %11, align 4, !tbaa !5
  ret i32 %12
}

attributes #0 = { nofree 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 #1 = { nofree 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


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