; LLVM IR from Ayon-SSP/The-SDE-Prep :: 1]_Data Structures/3]_Stack (Stackoperation)

; 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.3 = external hidden unnamed_addr constant [34 x i8], align 1

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

; Function Attrs: nounwind uwtable
define dso_local i32 @peek(i64 %0, ptr %1, i32 noundef %2) #1 {
  %4 = alloca i32, align 4
  %5 = alloca %struct.stack, align 8
  %6 = alloca i32, align 4
  %7 = getelementptr inbounds { i64, ptr }, ptr %5, i32 0, i32 0
  store i64 %0, ptr %7, align 8
  %8 = getelementptr inbounds { i64, ptr }, ptr %5, i32 0, i32 1
  store ptr %1, ptr %8, align 8
  store i32 %2, ptr %6, align 4, !tbaa !5
  %9 = getelementptr inbounds %struct.stack, ptr %5, i32 0, i32 1
  %10 = load i32, ptr %9, align 4, !tbaa !9
  %11 = icmp eq i32 %10, -1
  br i1 %11, label %12, label %14

12:                                               ; preds = %3
  %13 = call i32 (ptr, ...) @printf(ptr noundef @.str.3)
  br label %25

14:                                               ; preds = %3
  %15 = getelementptr inbounds %struct.stack, ptr %5, i32 0, i32 2
  %16 = load ptr, ptr %15, align 8, !tbaa !12
  %17 = getelementptr inbounds %struct.stack, ptr %5, i32 0, i32 1
  %18 = load i32, ptr %17, align 4, !tbaa !9
  %19 = load i32, ptr %6, align 4, !tbaa !5
  %20 = sub nsw i32 %18, %19
  %21 = add nsw i32 %20, 1
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds i32, ptr %16, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !5
  store i32 %24, ptr %4, align 4
  br label %25

25:                                               ; preds = %14, %12
  %26 = load i32, ptr %4, align 4
  ret i32 %26
}

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 = { 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"}
!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.3 = external hidden unnamed_addr constant [34 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
  %4 = icmp eq i64 %.sroa.1.0.extract.shift, 4294967295
  br i1 %4, label %5, label %7

5:                                                ; preds = %3
  %6 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.3)
  br label %13

7:                                                ; preds = %3
  %.sroa.1.0.extract.trunc = trunc nuw i64 %.sroa.1.0.extract.shift to i32
  %8 = sub nsw i32 %.sroa.1.0.extract.trunc, %2
  %9 = sext i32 %8 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
  br label %13

13:                                               ; preds = %7, %5
  %.0 = phi i32 [ undef, %5 ], [ %12, %7 ]
  ret i32 %.0
}

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