; LLVM IR from aap/pdp6 :: newemu (pdp6)

; 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.IOdev = type { i8, i32, ptr, ptr, ptr }

@numdevs = external hidden global i32, align 4
@devs = external hidden global [128 x ptr], align 16

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

6:                                                ; preds = %33, %2
  %7 = load i32, ptr %5, align 4, !tbaa !9
  %8 = load i32, ptr @numdevs, align 4, !tbaa !9
  %9 = icmp slt i32 %7, %8
  br i1 %9, label %11, label %10

10:                                               ; preds = %6
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %36

11:                                               ; preds = %6
  %12 = load i32, ptr %5, align 4, !tbaa !9
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [128 x ptr], ptr @devs, i64 0, i64 %13
  %15 = load ptr, ptr %14, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.IOdev, ptr %15, i32 0, i32 4
  %17 = load ptr, ptr %16, align 8, !tbaa !11
  %18 = icmp ne ptr %17, null
  br i1 %18, label %19, label %32

19:                                               ; preds = %11
  %20 = load i32, ptr %5, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds [128 x ptr], ptr @devs, i64 0, i64 %21
  %23 = load ptr, ptr %22, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.IOdev, ptr %23, i32 0, i32 4
  %25 = load ptr, ptr %24, align 8, !tbaa !11
  %26 = load ptr, ptr %3, align 8, !tbaa !5
  %27 = load i32, ptr %5, align 4, !tbaa !9
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds [128 x ptr], ptr @devs, i64 0, i64 %28
  %30 = load ptr, ptr %29, align 8, !tbaa !5
  %31 = load i32, ptr %4, align 4, !tbaa !9
  call void %25(ptr noundef %26, ptr noundef %30, i32 noundef %31)
  br label %32

32:                                               ; preds = %19, %11
  br label %33

33:                                               ; preds = %32
  %34 = load i32, ptr %5, align 4, !tbaa !9
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %5, align 4, !tbaa !9
  br label %6, !llvm.loop !13

36:                                               ; preds = %10
  ret void
}

attributes #0 = { 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 }

!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, !6, i64 24}
!12 = !{!"IOdev", !7, i64 0, !10, i64 4, !6, i64 8, !6, i64 16, !6, i64 24}
!13 = distinct !{!13, !14}
!14 = !{!"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"

@numdevs = external hidden local_unnamed_addr global i32, align 4
@devs = external hidden local_unnamed_addr global [128 x ptr], align 16

; Function Attrs: nounwind uwtable
define dso_local void @cycle_io(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = load i32, ptr @numdevs, align 4, !tbaa !5
  %4 = icmp sgt i32 %3, 0
  br i1 %4, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %11, %2
  ret void

.lr.ph:                                           ; preds = %2, %11
  %5 = phi i32 [ %12, %11 ], [ %3, %2 ]
  %indvars.iv = phi i64 [ %indvars.iv.next, %11 ], [ 0, %2 ]
  %6 = getelementptr inbounds [128 x ptr], ptr @devs, i64 0, i64 %indvars.iv
  %7 = load ptr, ptr %6, align 8, !tbaa !9
  %8 = getelementptr inbounds i8, ptr %7, i64 24
  %9 = load ptr, ptr %8, align 8, !tbaa !11
  %.not = icmp eq ptr %9, null
  br i1 %.not, label %11, label %10

10:                                               ; preds = %.lr.ph
  tail call void %9(ptr noundef %0, ptr noundef nonnull %7, i32 noundef %1) #1
  %.pre = load i32, ptr @numdevs, align 4, !tbaa !5
  br label %11

11:                                               ; preds = %.lr.ph, %10
  %12 = phi i32 [ %5, %.lr.ph ], [ %.pre, %10 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %13 = sext i32 %12 to i64
  %14 = icmp slt i64 %indvars.iv.next, %13
  br i1 %14, label %.lr.ph, label %._crit_edge, !llvm.loop !13
}

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 = { 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, !10, i64 24}
!12 = !{!"IOdev", !7, i64 0, !6, i64 4, !10, i64 8, !10, i64 16, !10, i64 24}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


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