; LLVM IR from shixiongfei/nio4c :: nio4c_socket (nio_pipe)

; 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.niosocket_s = type { i32 }

@__const.nio_pipe.sv = external hidden unnamed_addr constant [2 x i32], align 4

; 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 nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #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 i32 @nio_pipe(ptr noundef %0) #2 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca [2 x i32], align 4
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #4
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 %4, ptr align 4 @__const.nio_pipe.sv, i64 8, i1 false)
  %6 = getelementptr inbounds [2 x i32], ptr %4, i64 0, i64 0
  %7 = call i32 @socketpair(i32 noundef 1, i32 noundef 1, i32 noundef 0, ptr noundef %6) #4
  %8 = icmp slt i32 %7, 0
  br i1 %8, label %9, label %10

9:                                                ; preds = %1
  store i32 -1, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %21

10:                                               ; preds = %1
  %11 = getelementptr inbounds [2 x i32], ptr %4, i64 0, i64 0
  %12 = load i32, ptr %11, align 4, !tbaa !9
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.niosocket_s, ptr %13, i64 0
  %15 = getelementptr inbounds %struct.niosocket_s, ptr %14, i32 0, i32 0
  store i32 %12, ptr %15, align 4, !tbaa !11
  %16 = getelementptr inbounds [2 x i32], ptr %4, i64 0, i64 1
  %17 = load i32, ptr %16, align 4, !tbaa !9
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.niosocket_s, ptr %18, i64 1
  %20 = getelementptr inbounds %struct.niosocket_s, ptr %19, i32 0, i32 0
  store i32 %17, ptr %20, align 4, !tbaa !11
  store i32 0, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %21

21:                                               ; preds = %10, %9
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #4
  %22 = load i32, ptr %2, align 4
  ret i32 %22
}

; Function Attrs: nounwind
declare i32 @socketpair(i32 noundef, i32 noundef, i32 noundef, ptr noundef) #3

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
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 "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 #4 = { 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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"niosocket_s", !10, 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"

@__const.nio_pipe.sv = external hidden unnamed_addr constant [2 x i32], align 4

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

; Function Attrs: mustprogress 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 range(i32 -1, 1) i32 @nio_pipe(ptr nocapture noundef writeonly %0) local_unnamed_addr #1 {
  %2 = alloca [2 x i32], align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #3
  %3 = load i64, ptr @__const.nio_pipe.sv, align 4
  store i64 %3, ptr %2, align 8
  %4 = call i32 @socketpair(i32 noundef 1, i32 noundef 1, i32 noundef 0, ptr noundef nonnull %2) #3
  %5 = icmp slt i32 %4, 0
  br i1 %5, label %8, label %6

6:                                                ; preds = %1
  %7 = load <2 x i32>, ptr %2, align 8, !tbaa !5
  store <2 x i32> %7, ptr %0, align 4, !tbaa !9
  br label %8

8:                                                ; preds = %1, %6
  %.0 = phi i32 [ 0, %6 ], [ -1, %1 ]
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #3
  ret i32 %.0
}

; Function Attrs: nounwind
declare i32 @socketpair(i32 noundef, i32 noundef, i32 noundef, ptr noundef) local_unnamed_addr #2

attributes #0 = { mustprogress 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 "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, !6, i64 0}
!10 = !{!"niosocket_s", !6, i64 0}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SLPVectorizerPass,SROAPass,SimplifyCFGPass