; LLVM IR from jingweizhanghuai/Morn :: example (proc_message)

; 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 = external hidden unnamed_addr constant [18 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [7 x i8], align 1

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

declare i32 @usleep(i32 noundef) #1

declare i32 @printf(ptr noundef, ...) #1

; 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 @subscriber() #2 {
  %1 = alloca i32, align 4
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  store i32 0, ptr %1, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %20, %0
  %5 = call i32 @usleep(i32 noundef 100000)
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #3
  %6 = call ptr @m_ProcMessageRead(ptr noundef @.str.1, ptr noundef null, ptr noundef null)
  store ptr %6, ptr %2, align 8, !tbaa !9
  %7 = load ptr, ptr %2, align 8, !tbaa !9
  %8 = getelementptr inbounds i8, ptr %7, i64 0
  %9 = load i8, ptr %8, align 1, !tbaa !11
  %10 = sext i8 %9 to i32
  %11 = icmp eq i32 %10, 0
  br i1 %11, label %12, label %13

12:                                               ; preds = %4
  store i32 1, ptr %3, align 4
  br label %17

13:                                               ; preds = %4
  %14 = load i32, ptr %1, align 4, !tbaa !5
  %15 = load ptr, ptr %2, align 8, !tbaa !9
  %16 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %14, ptr noundef %15)
  store i32 0, ptr %3, align 4
  br label %17

17:                                               ; preds = %13, %12
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #3
  %18 = load i32, ptr %3, align 4
  switch i32 %18, label %23 [
    i32 0, label %19
  ]

19:                                               ; preds = %17
  br label %20

20:                                               ; preds = %19
  %21 = load i32, ptr %1, align 4, !tbaa !5
  %22 = add nsw i32 %21, 1
  store i32 %22, ptr %1, align 4, !tbaa !5
  br label %4

23:                                               ; preds = %17
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  ret void
}

declare ptr @m_ProcMessageRead(ptr noundef, ptr noundef, ptr noundef) #1

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { "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 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!7, !7, i64 0}


; 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 = external hidden unnamed_addr constant [18 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [7 x i8], align 1

declare i32 @usleep(i32 noundef) local_unnamed_addr #0

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

; Function Attrs: nounwind uwtable
define dso_local void @subscriber() local_unnamed_addr #2 {
  %1 = tail call i32 @usleep(i32 noundef 100000) #3
  %2 = tail call ptr @m_ProcMessageRead(ptr noundef nonnull @.str.1, ptr noundef null, ptr noundef null) #3
  %3 = load i8, ptr %2, align 1, !tbaa !5
  %.not5 = icmp eq i8 %3, 0
  br i1 %.not5, label %.critedge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.lr.ph
  %4 = phi ptr [ %8, %.lr.ph ], [ %2, %0 ]
  %.046 = phi i32 [ %6, %.lr.ph ], [ 0, %0 ]
  %5 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %.046, ptr noundef nonnull %4)
  %6 = add nuw nsw i32 %.046, 1
  %7 = tail call i32 @usleep(i32 noundef 100000) #3
  %8 = tail call ptr @m_ProcMessageRead(ptr noundef nonnull @.str.1, ptr noundef null, ptr noundef null) #3
  %9 = load i8, ptr %8, align 1, !tbaa !5
  %.not = icmp eq i8 %9, 0
  br i1 %.not, label %.critedge, label %.lr.ph

.critedge:                                        ; preds = %.lr.ph, %0
  ret void
}

declare ptr @m_ProcMessageRead(ptr noundef, ptr noundef, ptr noundef) local_unnamed_addr #0

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 = { 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 #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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}


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