; LLVM IR from PaulBatchelor/sndkit :: graforge (graforge)

; 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.gf_stack = type { i32, i32, ptr, ptr }

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

; 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 @gf_stack_swap(ptr noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = getelementptr inbounds %struct.gf_stack, ptr %6, i32 0, i32 0
  %8 = load i32, ptr %7, align 8, !tbaa !9
  %9 = icmp slt i32 %8, 2
  br i1 %9, label %10, label %11

10:                                               ; preds = %1
  store i32 1, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %51

11:                                               ; preds = %1
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = getelementptr inbounds %struct.gf_stack, ptr %12, i32 0, i32 3
  %14 = load ptr, ptr %13, align 8, !tbaa !12
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.gf_stack, ptr %15, i32 0, i32 0
  %17 = load i32, ptr %16, align 8, !tbaa !9
  %18 = sub nsw i32 %17, 1
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds ptr, ptr %14, i64 %19
  %21 = load ptr, ptr %20, align 8, !tbaa !5
  store ptr %21, ptr %4, align 8, !tbaa !5
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.gf_stack, ptr %22, i32 0, i32 3
  %24 = load ptr, ptr %23, align 8, !tbaa !12
  %25 = load ptr, ptr %3, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.gf_stack, ptr %25, i32 0, i32 0
  %27 = load i32, ptr %26, align 8, !tbaa !9
  %28 = sub nsw i32 %27, 2
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds ptr, ptr %24, i64 %29
  %31 = load ptr, ptr %30, align 8, !tbaa !5
  %32 = load ptr, ptr %3, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.gf_stack, ptr %32, i32 0, i32 3
  %34 = load ptr, ptr %33, align 8, !tbaa !12
  %35 = load ptr, ptr %3, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.gf_stack, ptr %35, i32 0, i32 0
  %37 = load i32, ptr %36, align 8, !tbaa !9
  %38 = sub nsw i32 %37, 1
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds ptr, ptr %34, i64 %39
  store ptr %31, ptr %40, align 8, !tbaa !5
  %41 = load ptr, ptr %4, align 8, !tbaa !5
  %42 = load ptr, ptr %3, align 8, !tbaa !5
  %43 = getelementptr inbounds %struct.gf_stack, ptr %42, i32 0, i32 3
  %44 = load ptr, ptr %43, align 8, !tbaa !12
  %45 = load ptr, ptr %3, align 8, !tbaa !5
  %46 = getelementptr inbounds %struct.gf_stack, ptr %45, i32 0, i32 0
  %47 = load i32, ptr %46, align 8, !tbaa !9
  %48 = sub nsw i32 %47, 2
  %49 = sext i32 %48 to i64
  %50 = getelementptr inbounds ptr, ptr %44, i64 %49
  store ptr %41, ptr %50, align 8, !tbaa !5
  store i32 0, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %51

51:                                               ; preds = %11, %10
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %52 = load i32, ptr %2, align 4
  ret i32 %52
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !11, i64 0}
!10 = !{!"gf_stack", !11, i64 0, !11, i64 4, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 16}


; 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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(readwrite, inaccessiblemem: none) uwtable
define dso_local range(i32 0, 2) i32 @gf_stack_swap(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = load i32, ptr %0, align 8, !tbaa !5
  %3 = icmp slt i32 %2, 2
  br i1 %3, label %16, label %4

4:                                                ; preds = %1
  %5 = getelementptr inbounds i8, ptr %0, i64 16
  %6 = load ptr, ptr %5, align 8, !tbaa !11
  %7 = zext nneg i32 %2 to i64
  %8 = getelementptr ptr, ptr %6, i64 %7
  %9 = getelementptr i8, ptr %8, i64 -8
  %10 = load ptr, ptr %9, align 8, !tbaa !12
  %11 = getelementptr i8, ptr %8, i64 -16
  %12 = load ptr, ptr %11, align 8, !tbaa !12
  store ptr %12, ptr %9, align 8, !tbaa !12
  %13 = load ptr, ptr %5, align 8, !tbaa !11
  %14 = getelementptr ptr, ptr %13, i64 %7
  %15 = getelementptr i8, ptr %14, i64 -16
  store ptr %10, ptr %15, align 8, !tbaa !12
  br label %16

16:                                               ; preds = %1, %4
  %.0 = phi i32 [ 0, %4 ], [ 1, %1 ]
  ret i32 %.0
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(readwrite, inaccessiblemem: none) 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, !7, i64 0}
!6 = !{!"gf_stack", !7, i64 0, !7, i64 4, !10, i64 8, !10, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !10, i64 16}
!12 = !{!10, !10, i64 0}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass