; LLVM IR from FOSS-UCSC/FOSSALGO :: data-structures/ds-stk/c (stack)

; 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"

@.str.2 = external hidden unnamed_addr constant [33 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [12 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local i32 @isempty() #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @peek() #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @pop() #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

declare i32 @printf(ptr noundef, ...) #2

; Function Attrs: nounwind uwtable
declare dso_local i32 @push(i32 noundef) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %3 = call i32 @push(i32 noundef 3)
  %4 = call i32 @push(i32 noundef 51)
  %5 = call i32 @push(i32 noundef 9)
  %6 = call i32 @push(i32 noundef 10)
  %7 = call i32 @push(i32 noundef 12)
  %8 = call i32 @push(i32 noundef 15)
  %9 = call i32 @peek()
  %10 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %9)
  %11 = call i32 (ptr, ...) @printf(ptr noundef @.str.3)
  br label %12

12:                                               ; preds = %16, %0
  %13 = call i32 @isempty()
  %14 = icmp ne i32 %13, 0
  %15 = xor i1 %14, true
  br i1 %15, label %16, label %20

16:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  %17 = call i32 @pop()
  store i32 %17, ptr %2, align 4, !tbaa !5
  %18 = load i32, ptr %2, align 4, !tbaa !5
  %19 = call i32 (ptr, ...) @printf(ptr noundef @.str.4, i32 noundef %18)
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  br label %12, !llvm.loop !9

20:                                               ; preds = %12
  ret i32 0
}

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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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 = distinct !{!9, !10}
!10 = !{!"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"

@.str.2 = external hidden unnamed_addr constant [33 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [12 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local i32 @isempty() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @peek() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @pop() local_unnamed_addr #0

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
declare dso_local i32 @push(i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = tail call i32 @push(i32 noundef 3)
  %2 = tail call i32 @push(i32 noundef 51)
  %3 = tail call i32 @push(i32 noundef 9)
  %4 = tail call i32 @push(i32 noundef 10)
  %5 = tail call i32 @push(i32 noundef 12)
  %6 = tail call i32 @push(i32 noundef 15)
  %7 = tail call i32 @peek()
  %8 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i32 noundef %7)
  %9 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.3)
  %10 = tail call i32 @isempty()
  %.not1 = icmp eq i32 %10, 0
  br i1 %.not1, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %0, %.lr.ph
  %11 = tail call i32 @pop()
  %12 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.4, i32 noundef %11)
  %13 = tail call i32 @isempty()
  %.not = icmp eq i32 %13, 0
  br i1 %.not, label %.lr.ph, label %._crit_edge, !llvm.loop !5

._crit_edge:                                      ; preds = %.lr.ph, %0
  ret i32 0
}

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 = { 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" }

!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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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