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

; 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, ptr }
%struct.stack_fval = type { ptr, ptr, 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: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1

; Function Attrs: nounwind uwtable
define dso_local void @s_clear(ptr noundef %0) #2 {
  %2 = alloca ptr, align 8
  %3 = alloca i64, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %4 = load ptr, ptr %2, align 8, !tbaa !5
  %5 = getelementptr inbounds %struct.stack, ptr %4, i32 0, i32 4
  %6 = load ptr, ptr %5, align 8, !tbaa !9
  %7 = getelementptr inbounds %struct.stack_fval, ptr %6, i32 0, i32 3
  %8 = load ptr, ptr %7, align 8, !tbaa !13
  %9 = icmp ne ptr %8, null
  br i1 %9, label %10, label %34

10:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  store i64 0, ptr %3, align 8, !tbaa !15
  br label %11

11:                                               ; preds = %30, %10
  %12 = load i64, ptr %3, align 8, !tbaa !15
  %13 = load ptr, ptr %2, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.stack, ptr %13, i32 0, i32 2
  %15 = load i64, ptr %14, align 8, !tbaa !16
  %16 = icmp ult i64 %12, %15
  br i1 %16, label %18, label %17

17:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  br label %33

18:                                               ; preds = %11
  %19 = load ptr, ptr %2, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.stack, ptr %19, i32 0, i32 4
  %21 = load ptr, ptr %20, align 8, !tbaa !9
  %22 = getelementptr inbounds %struct.stack_fval, ptr %21, i32 0, i32 3
  %23 = load ptr, ptr %22, align 8, !tbaa !13
  %24 = load ptr, ptr %2, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.stack, ptr %24, i32 0, i32 0
  %26 = load ptr, ptr %25, align 8, !tbaa !17
  %27 = load i64, ptr %3, align 8, !tbaa !15
  %28 = getelementptr inbounds i32, ptr %26, i64 %27
  %29 = load i32, ptr %28, align 4, !tbaa !18
  call void %23(i32 noundef %29)
  br label %30

30:                                               ; preds = %18
  %31 = load i64, ptr %3, align 8, !tbaa !15
  %32 = add i64 %31, 1
  store i64 %32, ptr %3, align 8, !tbaa !15
  br label %11, !llvm.loop !19

33:                                               ; preds = %17
  br label %34

34:                                               ; preds = %33, %1
  %35 = load ptr, ptr %2, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.stack, ptr %35, i32 0, i32 0
  %37 = load ptr, ptr %36, align 8, !tbaa !17
  %38 = load ptr, ptr %2, align 8, !tbaa !5
  %39 = getelementptr inbounds %struct.stack, ptr %38, i32 0, i32 1
  %40 = load i64, ptr %39, align 8, !tbaa !21
  %41 = mul i64 4, %40
  call void @llvm.memset.p0.i64(ptr align 4 %37, i8 0, i64 %41, i1 false)
  %42 = load ptr, ptr %2, align 8, !tbaa !5
  %43 = getelementptr inbounds %struct.stack, ptr %42, i32 0, i32 2
  store i64 0, ptr %43, align 8, !tbaa !16
  %44 = load ptr, ptr %2, align 8, !tbaa !5
  %45 = getelementptr inbounds %struct.stack, ptr %44, i32 0, i32 3
  store i32 0, ptr %45, align 8, !tbaa !22
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nocallback nofree nounwind willreturn memory(argmem: write) }
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, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !6, i64 32}
!10 = !{!"stack", !6, i64 0, !11, i64 8, !11, i64 16, !12, i64 24, !6, i64 32, !6, i64 40, !6, i64 48}
!11 = !{!"long", !7, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!14, !6, i64 24}
!14 = !{!"stack_fval", !6, i64 0, !6, i64 8, !6, i64 16, !6, i64 24, !6, i64 32, !6, i64 40}
!15 = !{!11, !11, i64 0}
!16 = !{!10, !11, i64 16}
!17 = !{!10, !6, i64 0}
!18 = !{!12, !12, i64 0}
!19 = distinct !{!19, !20}
!20 = !{!"llvm.loop.mustprogress"}
!21 = !{!10, !11, i64 8}
!22 = !{!10, !12, 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"

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #0

; Function Attrs: nounwind uwtable
define dso_local void @s_clear(ptr nocapture noundef %0) local_unnamed_addr #1 {
  %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, label %.preheader

.preheader:                                       ; preds = %1
  %6 = getelementptr inbounds i8, ptr %0, i64 16
  %7 = load i64, ptr %6, align 8, !tbaa !14
  %.not11 = icmp eq i64 %7, 0
  br i1 %.not11, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.010 = phi i64 [ %14, %.lr.ph ], [ 0, %.preheader ]
  %8 = load ptr, ptr %2, align 8, !tbaa !5
  %9 = getelementptr inbounds i8, ptr %8, i64 24
  %10 = load ptr, ptr %9, align 8, !tbaa !12
  %11 = load ptr, ptr %0, align 8, !tbaa !15
  %12 = getelementptr inbounds i32, ptr %11, i64 %.010
  %13 = load i32, ptr %12, align 4, !tbaa !16
  tail call void %10(i32 noundef %13) #2
  %14 = add nuw i64 %.010, 1
  %15 = load i64, ptr %6, align 8, !tbaa !14
  %16 = icmp ult i64 %14, %15
  br i1 %16, label %.lr.ph, label %.loopexit, !llvm.loop !17

.loopexit:                                        ; preds = %.lr.ph, %.preheader, %1
  %17 = load ptr, ptr %0, align 8, !tbaa !15
  %18 = getelementptr inbounds i8, ptr %0, i64 8
  %19 = load i64, ptr %18, align 8, !tbaa !19
  %20 = shl i64 %19, 2
  tail call void @llvm.memset.p0.i64(ptr align 4 %17, i8 0, i64 %20, i1 false)
  %21 = getelementptr inbounds i8, ptr %0, i64 16
  store i64 0, ptr %21, align 8, !tbaa !14
  %22 = getelementptr inbounds i8, ptr %0, i64 24
  store i32 0, ptr %22, align 8, !tbaa !20
  ret void
}

attributes #0 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: write) }
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, i64 48}
!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, !10, i64 16}
!15 = !{!6, !7, i64 0}
!16 = !{!11, !11, i64 0}
!17 = distinct !{!17, !18}
!18 = !{!"llvm.loop.mustprogress"}
!19 = !{!6, !10, i64 8}
!20 = !{!6, !11, i64 24}


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