; LLVM IR from asllop/AppOS :: core/sys/io/arch/pc32 (io)

; 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"

; 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 @init_cpu_ints() #1 {
  %1 = 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 %2

2:                                                ; preds = %9, %0
  %3 = load i32, ptr %1, align 4, !tbaa !5
  %4 = icmp slt i32 %3, 256
  br i1 %4, label %6, label %5

5:                                                ; preds = %2
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  br label %12

6:                                                ; preds = %2
  %7 = load i32, ptr %1, align 4, !tbaa !5
  %8 = trunc i32 %7 to i8
  call void @set_isr(ptr noundef @empty_int_isr, i8 noundef zeroext %8)
  br label %9

9:                                                ; preds = %6
  %10 = load i32, ptr %1, align 4, !tbaa !5
  %11 = add nsw i32 %10, 1
  store i32 %11, ptr %1, align 4, !tbaa !5
  br label %2, !llvm.loop !9

12:                                               ; preds = %5
  call void @set_isr(ptr noundef @bad_thing_isr, i8 noundef zeroext 0)
  call void @set_isr(ptr noundef @bad_thing_isr, i8 noundef zeroext 5)
  call void @set_isr(ptr noundef @bad_thing_isr, i8 noundef zeroext 6)
  call void @set_isr(ptr noundef @bad_thing_isr, i8 noundef zeroext 8)
  call void @set_isr(ptr noundef @bad_thing_isr, i8 noundef zeroext 10)
  call void @set_isr(ptr noundef @bad_thing_isr, i8 noundef zeroext 11)
  call void @set_isr(ptr noundef @bad_thing_isr, i8 noundef zeroext 12)
  call void @set_isr(ptr noundef @bad_thing_isr, i8 noundef zeroext 13)
  call void @set_isr(ptr noundef @bad_thing_isr, i8 noundef zeroext 14)
  call void @set_isr(ptr noundef @bad_thing_isr, i8 noundef zeroext 16)
  call void @set_isr(ptr noundef @bad_thing_isr, i8 noundef zeroext 17)
  call void @set_isr(ptr noundef @bad_thing_isr, i8 noundef zeroext 18)
  ret void
}

declare void @set_isr(ptr noundef, i8 noundef zeroext) #2

declare void @empty_int_isr(...) #2

declare void @bad_thing_isr(...) #2

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 = { "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 = distinct !{!9, !10}
!10 = !{!"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"

; Function Attrs: nounwind uwtable
define dso_local void @init_cpu_ints() local_unnamed_addr #0 {
  br label %2

1:                                                ; preds = %2
  tail call void @set_isr(ptr noundef nonnull @bad_thing_isr, i8 noundef zeroext 0) #2
  tail call void @set_isr(ptr noundef nonnull @bad_thing_isr, i8 noundef zeroext 5) #2
  tail call void @set_isr(ptr noundef nonnull @bad_thing_isr, i8 noundef zeroext 6) #2
  tail call void @set_isr(ptr noundef nonnull @bad_thing_isr, i8 noundef zeroext 8) #2
  tail call void @set_isr(ptr noundef nonnull @bad_thing_isr, i8 noundef zeroext 10) #2
  tail call void @set_isr(ptr noundef nonnull @bad_thing_isr, i8 noundef zeroext 11) #2
  tail call void @set_isr(ptr noundef nonnull @bad_thing_isr, i8 noundef zeroext 12) #2
  tail call void @set_isr(ptr noundef nonnull @bad_thing_isr, i8 noundef zeroext 13) #2
  tail call void @set_isr(ptr noundef nonnull @bad_thing_isr, i8 noundef zeroext 14) #2
  tail call void @set_isr(ptr noundef nonnull @bad_thing_isr, i8 noundef zeroext 16) #2
  tail call void @set_isr(ptr noundef nonnull @bad_thing_isr, i8 noundef zeroext 17) #2
  tail call void @set_isr(ptr noundef nonnull @bad_thing_isr, i8 noundef zeroext 18) #2
  ret void

2:                                                ; preds = %0, %2
  %.03 = phi i32 [ 0, %0 ], [ %4, %2 ]
  %3 = trunc nuw i32 %.03 to i8
  tail call void @set_isr(ptr noundef nonnull @empty_int_isr, i8 noundef zeroext %3) #2
  %4 = add nuw nsw i32 %.03, 1
  %exitcond.not = icmp eq i32 %4, 256
  br i1 %exitcond.not, label %1, label %2, !llvm.loop !5
}

declare void @set_isr(ptr noundef, i8 noundef zeroext) local_unnamed_addr #1

declare void @empty_int_isr(...) #1

declare void @bad_thing_isr(...) #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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,SROAPass,SimplifyCFGPass,TailCallElimPass