; LLVM IR from uNetworking/uSockets :: src (bsd)

; 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.mmsghdr = type { %struct.msghdr, i32 }
%struct.msghdr = type { ptr, i32, ptr, i64, ptr, i64, i32 }

; Function Attrs: nounwind uwtable
define dso_local i32 @bsd_recvmmsg(i32 noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3, ptr noundef %4) #0 {
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca ptr, align 8
  %11 = alloca i32, align 4
  store i32 %0, ptr %6, align 4, !tbaa !5
  store ptr %1, ptr %7, align 8, !tbaa !9
  store i32 %2, ptr %8, align 4, !tbaa !5
  store i32 %3, ptr %9, align 4, !tbaa !5
  store ptr %4, ptr %10, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #3
  store i32 0, ptr %11, align 4, !tbaa !5
  br label %12

12:                                               ; preds = %24, %5
  %13 = load i32, ptr %11, align 4, !tbaa !5
  %14 = load i32, ptr %8, align 4, !tbaa !5
  %15 = icmp ult i32 %13, %14
  br i1 %15, label %17, label %16

16:                                               ; preds = %12
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #3
  br label %27

17:                                               ; preds = %12
  %18 = load ptr, ptr %7, align 8, !tbaa !9
  %19 = load i32, ptr %11, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds %struct.mmsghdr, ptr %18, i64 %20
  %22 = getelementptr inbounds %struct.mmsghdr, ptr %21, i32 0, i32 0
  %23 = getelementptr inbounds %struct.msghdr, ptr %22, i32 0, i32 5
  store i64 256, ptr %23, align 8, !tbaa !11
  br label %24

24:                                               ; preds = %17
  %25 = load i32, ptr %11, align 4, !tbaa !5
  %26 = add nsw i32 %25, 1
  store i32 %26, ptr %11, align 4, !tbaa !5
  br label %12, !llvm.loop !15

27:                                               ; preds = %16
  %28 = load i32, ptr %6, align 4, !tbaa !5
  %29 = load ptr, ptr %7, align 8, !tbaa !9
  %30 = load i32, ptr %8, align 4, !tbaa !5
  %31 = load i32, ptr %9, align 4, !tbaa !5
  %32 = call i32 @recvmmsg(i32 noundef %28, ptr noundef %29, i32 noundef %30, i32 noundef %31, ptr noundef null)
  ret i32 %32
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

declare i32 @recvmmsg(i32 noundef, ptr noundef, i32 noundef, i32 noundef, ptr noundef) #2

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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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 = !{!12, !14, i64 40}
!12 = !{!"mmsghdr", !13, i64 0, !6, i64 56}
!13 = !{!"msghdr", !10, i64 0, !6, i64 8, !10, i64 16, !14, i64 24, !10, i64 32, !14, i64 40, !6, i64 48}
!14 = !{!"long", !7, i64 0}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}


; 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.mmsghdr = type { %struct.msghdr, i32 }
%struct.msghdr = type { ptr, i32, ptr, i64, ptr, i64, i32 }

; Function Attrs: nounwind uwtable
define dso_local i32 @bsd_recvmmsg(i32 noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3, ptr nocapture noundef readnone %4) local_unnamed_addr #0 {
  %.not = icmp eq i32 %2, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %5
  %wide.trip.count = zext i32 %2 to i64
  %xtraiter = and i64 %wide.trip.count, 3
  %6 = icmp ult i32 %2, 4
  br i1 %6, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %wide.trip.count, 4294967292
  br label %.lr.ph

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %indvars.iv.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next.3, %.lr.ph ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil
  %indvars.iv.epil = phi i64 [ %indvars.iv.next.epil, %.lr.ph.epil ], [ %indvars.iv.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i64 [ %epil.iter.next, %.lr.ph.epil ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %7 = getelementptr inbounds %struct.mmsghdr, ptr %1, i64 %indvars.iv.epil, i32 0, i32 5
  store i64 256, ptr %7, align 8, !tbaa !5
  %indvars.iv.next.epil = add nuw nsw i64 %indvars.iv.epil, 1
  %epil.iter.next = add i64 %epil.iter, 1
  %epil.iter.cmp.not = icmp eq i64 %epil.iter.next, %xtraiter
  br i1 %epil.iter.cmp.not, label %._crit_edge, label %.lr.ph.epil, !llvm.loop !13

._crit_edge:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil, %5
  %8 = tail call i32 @recvmmsg(i32 noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3, ptr noundef null) #2
  ret i32 %8

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader.new ], [ %indvars.iv.next.3, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.3, %.lr.ph ]
  %9 = getelementptr inbounds %struct.mmsghdr, ptr %1, i64 %indvars.iv, i32 0, i32 5
  store i64 256, ptr %9, align 8, !tbaa !5
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %10 = getelementptr inbounds %struct.mmsghdr, ptr %1, i64 %indvars.iv.next, i32 0, i32 5
  store i64 256, ptr %10, align 8, !tbaa !5
  %indvars.iv.next.1 = or disjoint i64 %indvars.iv, 2
  %11 = getelementptr inbounds %struct.mmsghdr, ptr %1, i64 %indvars.iv.next.1, i32 0, i32 5
  store i64 256, ptr %11, align 8, !tbaa !5
  %indvars.iv.next.2 = or disjoint i64 %indvars.iv, 3
  %12 = getelementptr inbounds %struct.mmsghdr, ptr %1, i64 %indvars.iv.next.2, i32 0, i32 5
  store i64 256, ptr %12, align 8, !tbaa !5
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %niter.next.3 = add i64 %niter, 4
  %niter.ncmp.3 = icmp eq i64 %niter.next.3, %unroll_iter
  br i1 %niter.ncmp.3, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !15
}

declare i32 @recvmmsg(i32 noundef, ptr noundef, i32 noundef, i32 noundef, ptr noundef) local_unnamed_addr #1

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 = { "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, !12, i64 40}
!6 = !{!"mmsghdr", !7, i64 0, !11, i64 56}
!7 = !{!"msghdr", !8, i64 0, !11, i64 8, !8, i64 16, !12, i64 24, !8, i64 32, !12, i64 40, !11, i64 48}
!8 = !{!"any pointer", !9, i64 0}
!9 = !{!"omnipotent char", !10, i64 0}
!10 = !{!"Simple C/C++ TBAA"}
!11 = !{!"int", !9, i64 0}
!12 = !{!"long", !9, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.unroll.disable"}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}


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