; LLVM IR from LeoVen/C-Macro-Collections :: examples (hanoi)

; 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 { ptr, i64, i64, i32, ptr, ptr }
%struct.stack_fval = type { ptr, ptr, ptr, ptr, ptr, ptr }
%struct.cmc_alloc_node = type { ptr, ptr, 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 void @stk_release(ptr noundef byval(%struct.stack) align 8 %0) #1 {
  %2 = alloca i64, align 8
  %3 = getelementptr inbounds %struct.stack, ptr %0, i32 0, i32 4
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %5 = getelementptr inbounds %struct.stack_fval, ptr %4, i32 0, i32 3
  %6 = load ptr, ptr %5, align 8, !tbaa !12
  %7 = icmp ne ptr %6, null
  br i1 %7, label %8, label %29

8:                                                ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #2
  store i64 0, ptr %2, align 8, !tbaa !14
  br label %9

9:                                                ; preds = %25, %8
  %10 = load i64, ptr %2, align 8, !tbaa !14
  %11 = getelementptr inbounds %struct.stack, ptr %0, i32 0, i32 2
  %12 = load i64, ptr %11, align 8, !tbaa !15
  %13 = icmp ult i64 %10, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #2
  br label %28

15:                                               ; preds = %9
  %16 = getelementptr inbounds %struct.stack, ptr %0, i32 0, i32 4
  %17 = load ptr, ptr %16, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.stack_fval, ptr %17, i32 0, i32 3
  %19 = load ptr, ptr %18, align 8, !tbaa !12
  %20 = getelementptr inbounds %struct.stack, ptr %0, i32 0, i32 0
  %21 = load ptr, ptr %20, align 8, !tbaa !16
  %22 = load i64, ptr %2, align 8, !tbaa !14
  %23 = getelementptr inbounds i32, ptr %21, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !17
  call void %19(i32 noundef %24)
  br label %25

25:                                               ; preds = %15
  %26 = load i64, ptr %2, align 8, !tbaa !14
  %27 = add i64 %26, 1
  store i64 %27, ptr %2, align 8, !tbaa !14
  br label %9, !llvm.loop !18

28:                                               ; preds = %14
  br label %29

29:                                               ; preds = %28, %1
  %30 = getelementptr inbounds %struct.stack, ptr %0, i32 0, i32 5
  %31 = load ptr, ptr %30, align 8, !tbaa !20
  %32 = getelementptr inbounds %struct.cmc_alloc_node, ptr %31, i32 0, i32 3
  %33 = load ptr, ptr %32, align 8, !tbaa !21
  %34 = getelementptr inbounds %struct.stack, ptr %0, i32 0, i32 0
  %35 = load ptr, ptr %34, align 8, !tbaa !16
  call void %33(ptr noundef %35)
  ret void
}

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, !7, i64 32}
!6 = !{!"stack", !7, i64 0, !10, i64 8, !10, i64 16, !11, i64 24, !7, i64 32, !7, i64 40}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"long", !8, i64 0}
!11 = !{!"int", !8, i64 0}
!12 = !{!13, !7, i64 24}
!13 = !{!"stack_fval", !7, i64 0, !7, i64 8, !7, i64 16, !7, i64 24, !7, i64 32, !7, i64 40}
!14 = !{!10, !10, i64 0}
!15 = !{!6, !10, i64 16}
!16 = !{!6, !7, i64 0}
!17 = !{!11, !11, i64 0}
!18 = distinct !{!18, !19}
!19 = !{!"llvm.loop.mustprogress"}
!20 = !{!6, !7, i64 40}
!21 = !{!22, !7, i64 24}
!22 = !{!"cmc_alloc_node", !7, i64 0, !7, i64 8, !7, i64 16, !7, i64 24}


; 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 { ptr, i64, i64, i32, ptr, ptr }

; Function Attrs: nounwind uwtable
define dso_local void @stk_release(ptr nocapture noundef readonly byval(%struct.stack) align 8 %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 32
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %3, i64 24
  %5 = load ptr, ptr %4, align 8, !tbaa !12
  %.not = icmp eq ptr %5, null
  br i1 %.not, label %..loopexit_crit_edge, label %.preheader

..loopexit_crit_edge:                             ; preds = %1
  %.pre = load ptr, ptr %0, align 8, !tbaa !14
  br label %.loopexit

.preheader:                                       ; preds = %1
  %6 = getelementptr inbounds i8, ptr %0, i64 16
  %7 = load i64, ptr %6, align 8, !tbaa !15
  %.not4 = icmp eq i64 %7, 0
  %.pre5 = load ptr, ptr %0, align 8, !tbaa !14
  br i1 %.not4, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.03 = phi i64 [ %11, %.lr.ph ], [ 0, %.preheader ]
  %8 = load ptr, ptr %4, align 8, !tbaa !12
  %9 = getelementptr inbounds i32, ptr %.pre5, i64 %.03
  %10 = load i32, ptr %9, align 4, !tbaa !16
  tail call void %8(i32 noundef %10) #1
  %11 = add nuw i64 %.03, 1
  %exitcond.not = icmp eq i64 %11, %7
  br i1 %exitcond.not, label %.loopexit, label %.lr.ph, !llvm.loop !17

.loopexit:                                        ; preds = %.lr.ph, %..loopexit_crit_edge, %.preheader
  %12 = phi ptr [ %.pre, %..loopexit_crit_edge ], [ %.pre5, %.preheader ], [ %.pre5, %.lr.ph ]
  %13 = getelementptr inbounds i8, ptr %0, i64 40
  %14 = load ptr, ptr %13, align 8, !tbaa !19
  %15 = getelementptr inbounds i8, ptr %14, i64 24
  %16 = load ptr, ptr %15, align 8, !tbaa !20
  tail call void %16(ptr noundef %12) #1
  ret void
}

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 = { 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, !7, i64 32}
!6 = !{!"stack", !7, i64 0, !10, i64 8, !10, i64 16, !11, i64 24, !7, i64 32, !7, i64 40}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"long", !8, i64 0}
!11 = !{!"int", !8, i64 0}
!12 = !{!13, !7, i64 24}
!13 = !{!"stack_fval", !7, i64 0, !7, i64 8, !7, i64 16, !7, i64 24, !7, i64 32, !7, i64 40}
!14 = !{!6, !7, i64 0}
!15 = !{!6, !10, i64 16}
!16 = !{!11, !11, i64 0}
!17 = distinct !{!17, !18}
!18 = !{!"llvm.loop.mustprogress"}
!19 = !{!6, !7, i64 40}
!20 = !{!21, !7, i64 24}
!21 = !{!"cmc_alloc_node", !7, i64 0, !7, i64 8, !7, i64 16, !7, i64 24}


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