; LLVM IR from AllAlgorithms/c :: algorithms/data-structures (StackUsingLinkedList)

; 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, ptr }

@size = external dso_local global i32, align 4
@top = external dso_local global ptr, align 8
@.str.15 = external hidden unnamed_addr constant [17 x i8], align 1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

declare i32 @printf(ptr noundef, ...) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @pop() #2 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #4
  store i32 0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #4
  %5 = load i32, ptr @size, align 4, !tbaa !5
  %6 = icmp sle i32 %5, 0
  br i1 %6, label %10, label %7

7:                                                ; preds = %0
  %8 = load ptr, ptr @top, align 8, !tbaa !9
  %9 = icmp ne ptr %8, null
  br i1 %9, label %12, label %10

10:                                               ; preds = %7, %0
  %11 = call i32 (ptr, ...) @printf(ptr noundef @.str.15)
  store i32 -2147483648, ptr %1, align 4
  store i32 1, ptr %4, align 4
  br label %24

12:                                               ; preds = %7
  %13 = load ptr, ptr @top, align 8, !tbaa !9
  store ptr %13, ptr %3, align 8, !tbaa !9
  %14 = load ptr, ptr @top, align 8, !tbaa !9
  %15 = getelementptr inbounds %struct.stack, ptr %14, i32 0, i32 0
  %16 = load i32, ptr %15, align 8, !tbaa !11
  store i32 %16, ptr %2, align 4, !tbaa !5
  %17 = load ptr, ptr @top, align 8, !tbaa !9
  %18 = getelementptr inbounds %struct.stack, ptr %17, i32 0, i32 1
  %19 = load ptr, ptr %18, align 8, !tbaa !13
  store ptr %19, ptr @top, align 8, !tbaa !9
  %20 = load ptr, ptr %3, align 8, !tbaa !9
  call void @free(ptr noundef %20) #4
  %21 = load i32, ptr @size, align 4, !tbaa !5
  %22 = add nsw i32 %21, -1
  store i32 %22, ptr @size, align 4, !tbaa !5
  %23 = load i32, ptr %2, align 4, !tbaa !5
  store i32 %23, ptr %1, align 4
  store i32 1, ptr %4, align 4
  br label %24

24:                                               ; preds = %12, %10
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #4
  %25 = load i32, ptr %1, align 4
  ret i32 %25
}

; Function Attrs: nounwind
declare void @free(ptr noundef) #3

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { "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 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 "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 #4 = { 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, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !6, i64 0}
!12 = !{!"stack", !6, i64 0, !10, i64 8}
!13 = !{!12, !10, 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"

@size = external dso_local local_unnamed_addr global i32, align 4
@top = external dso_local local_unnamed_addr global ptr, align 8
@.str.15 = external hidden unnamed_addr constant [17 x i8], align 1

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

; Function Attrs: nounwind uwtable
define dso_local i32 @pop() local_unnamed_addr #1 {
  %1 = load i32, ptr @size, align 4, !tbaa !5
  %2 = icmp sgt i32 %1, 0
  %3 = load ptr, ptr @top, align 8
  %4 = icmp ne ptr %3, null
  %or.cond = select i1 %2, i1 %4, i1 false
  br i1 %or.cond, label %7, label %5

5:                                                ; preds = %0
  %6 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.15)
  br label %13

7:                                                ; preds = %0
  %8 = load i32, ptr %3, align 8, !tbaa !9
  %9 = getelementptr inbounds i8, ptr %3, i64 8
  %10 = load ptr, ptr %9, align 8, !tbaa !12
  store ptr %10, ptr @top, align 8, !tbaa !13
  tail call void @free(ptr noundef nonnull %3) #3
  %11 = load i32, ptr @size, align 4, !tbaa !5
  %12 = add nsw i32 %11, -1
  store i32 %12, ptr @size, align 4, !tbaa !5
  br label %13

13:                                               ; preds = %7, %5
  %.0 = phi i32 [ %8, %7 ], [ -2147483648, %5 ]
  ret i32 %.0
}

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #2

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 = { 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 #2 = { mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite) "alloc-family"="malloc" "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 0}
!10 = !{!"stack", !6, i64 0, !11, i64 8}
!11 = !{!"any pointer", !7, i64 0}
!12 = !{!10, !11, i64 8}
!13 = !{!11, !11, i64 0}


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