; LLVM IR from VAR-solutions/Algorithms :: data structures/stack/c (stack_in_c)

; 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 { [5 x i32], i32 }

@s = external dso_local global %struct.stack, align 4
@.str.13 = external hidden unnamed_addr constant [16 x i8], align 1
@.str.14 = external hidden unnamed_addr constant [31 x i8], align 1
@.str.15 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.16 = external hidden unnamed_addr constant [2 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: nounwind uwtable
define dso_local void @display() #2 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  %3 = load i32, ptr getelementptr inbounds (%struct.stack, ptr @s, i32 0, i32 1), align 4, !tbaa !5
  %4 = icmp eq i32 %3, -1
  br i1 %4, label %5, label %7

5:                                                ; preds = %0
  %6 = call i32 (ptr, ...) @printf(ptr noundef @.str.13)
  store i32 1, ptr %2, align 4
  br label %25

7:                                                ; preds = %0
  %8 = call i32 (ptr, ...) @printf(ptr noundef @.str.14)
  %9 = load i32, ptr getelementptr inbounds (%struct.stack, ptr @s, i32 0, i32 1), align 4, !tbaa !5
  store i32 %9, ptr %1, align 4, !tbaa !10
  br label %10

10:                                               ; preds = %19, %7
  %11 = load i32, ptr %1, align 4, !tbaa !10
  %12 = icmp sge i32 %11, 0
  br i1 %12, label %13, label %22

13:                                               ; preds = %10
  %14 = load i32, ptr %1, align 4, !tbaa !10
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [5 x i32], ptr @s, i64 0, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !10
  %18 = call i32 (ptr, ...) @printf(ptr noundef @.str.15, i32 noundef %17)
  br label %19

19:                                               ; preds = %13
  %20 = load i32, ptr %1, align 4, !tbaa !10
  %21 = add nsw i32 %20, -1
  store i32 %21, ptr %1, align 4, !tbaa !10
  br label %10, !llvm.loop !11

22:                                               ; preds = %10
  br label %23

23:                                               ; preds = %22
  %24 = call i32 (ptr, ...) @printf(ptr noundef @.str.16)
  store i32 0, ptr %2, align 4
  br label %25

25:                                               ; preds = %23, %5
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  %26 = load i32, ptr %2, align 4
  switch i32 %26, label %28 [
    i32 0, label %27
    i32 1, label %27
  ]

27:                                               ; preds = %25, %25
  ret void

28:                                               ; preds = %25
  unreachable
}

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

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 }

!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 20}
!6 = !{!"stack", !7, i64 0, !9, i64 20}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!"int", !7, i64 0}
!10 = !{!9, !9, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; 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 { [5 x i32], i32 }

@s = external dso_local local_unnamed_addr global %struct.stack, align 4
@.str.13 = external hidden unnamed_addr constant [16 x i8], align 1
@.str.14 = external hidden unnamed_addr constant [31 x i8], align 1
@.str.15 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.16 = external hidden unnamed_addr constant [2 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 void @display() local_unnamed_addr #1 {
  %1 = load i32, ptr getelementptr inbounds (i8, ptr @s, i64 20), align 4, !tbaa !5
  %2 = icmp eq i32 %1, -1
  br i1 %2, label %._crit_edge, label %3

3:                                                ; preds = %0
  %4 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.14)
  %5 = load i32, ptr getelementptr inbounds (i8, ptr @s, i64 20), align 4, !tbaa !5
  %6 = icmp sgt i32 %5, -1
  br i1 %6, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %3
  %7 = zext nneg i32 %5 to i64
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv = phi i64 [ %7, %.lr.ph.preheader ], [ %indvars.iv.next, %.lr.ph ]
  %8 = getelementptr inbounds [5 x i32], ptr @s, i64 0, i64 %indvars.iv
  %9 = load i32, ptr %8, align 4, !tbaa !10
  %10 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.15, i32 noundef %9)
  %indvars.iv.next = add nsw i64 %indvars.iv, -1
  %.not = icmp eq i64 %indvars.iv, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !11

._crit_edge:                                      ; preds = %.lr.ph, %3, %0
  %.str.16.sink = phi ptr [ @.str.13, %0 ], [ @.str.16, %3 ], [ @.str.16, %.lr.ph ]
  %11 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) %.str.16.sink)
  ret void
}

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, !9, i64 20}
!6 = !{!"stack", !7, i64 0, !9, i64 20}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!"int", !7, i64 0}
!10 = !{!9, !9, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass