; LLVM IR from shixiongfei/nio4c :: nio4c_poll (nio_pollinit)

; 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"

@nio_pollcreate = external dso_local global ptr, align 8

; Function Attrs: nounwind uwtable
define dso_local i32 @nio_pollinit(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %3 = load ptr, ptr %2, align 8, !tbaa !5
  %4 = icmp ne ptr %3, null
  br i1 %4, label %5, label %7

5:                                                ; preds = %1
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %6, ptr @nio_pollcreate, align 8, !tbaa !5
  br label %7

7:                                                ; preds = %5, %1
  %8 = load ptr, ptr @nio_pollcreate, align 8, !tbaa !5
  %9 = icmp ne ptr %8, null
  br i1 %9, label %11, label %10

10:                                               ; preds = %7
  store ptr @nioepoll_create, ptr @nio_pollcreate, align 8, !tbaa !5
  br label %11

11:                                               ; preds = %10, %7
  %12 = load ptr, ptr @nio_pollcreate, align 8, !tbaa !5
  %13 = icmp ne ptr %12, null
  %14 = zext i1 %13 to i64
  %15 = select i1 %13, i32 0, i32 -1
  ret i32 %15
}

; Function Attrs: nounwind uwtable
declare hidden ptr @nioepoll_create() #0

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" }

!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"}


; 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"

@nio_pollcreate = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef range(i32 -1, 1) i32 @nio_pollinit(ptr noundef %0) local_unnamed_addr #0 {
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %2, label %.sink.split

2:                                                ; preds = %1
  %.pr = load ptr, ptr @nio_pollcreate, align 8, !tbaa !5
  %.not2 = icmp eq ptr %.pr, null
  br i1 %.not2, label %.sink.split, label %3

.sink.split:                                      ; preds = %2, %1
  %.sink = phi ptr [ %0, %1 ], [ @nioepoll_create, %2 ]
  store ptr %.sink, ptr @nio_pollcreate, align 8, !tbaa !5
  br label %3

3:                                                ; preds = %.sink.split, %2
  ret i32 0
}

; Function Attrs: nounwind uwtable
declare hidden ptr @nioepoll_create() #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(readwrite, argmem: none, 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" }
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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: BDCEPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InstCombinePass,JumpThreadingPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass