; LLVM IR from Stephane-D/SGDK :: src (vdp)

; 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"

@regValues = external hidden global [19 x i8], 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 @VDP_setScanMode(i16 noundef zeroext %0) #1 {
  %2 = alloca i16, align 2
  %3 = alloca ptr, align 8
  store i16 %0, ptr %2, align 2, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  %4 = load i16, ptr %2, align 2, !tbaa !5
  %5 = zext i16 %4 to i32
  %6 = icmp eq i32 %5, 0
  br i1 %6, label %7, label %12

7:                                                ; preds = %1
  %8 = load i8, ptr getelementptr inbounds ([19 x i8], ptr @regValues, i64 0, i64 12), align 4, !tbaa !9
  %9 = zext i8 %8 to i32
  %10 = and i32 %9, -7
  %11 = trunc i32 %10 to i8
  store i8 %11, ptr getelementptr inbounds ([19 x i8], ptr @regValues, i64 0, i64 12), align 4, !tbaa !9
  br label %28

12:                                               ; preds = %1
  %13 = load i16, ptr %2, align 2, !tbaa !5
  %14 = zext i16 %13 to i32
  %15 = icmp eq i32 %14, 1
  br i1 %15, label %16, label %22

16:                                               ; preds = %12
  %17 = load i8, ptr getelementptr inbounds ([19 x i8], ptr @regValues, i64 0, i64 12), align 4, !tbaa !9
  %18 = zext i8 %17 to i32
  %19 = and i32 %18, -5
  %20 = or i32 %19, 2
  %21 = trunc i32 %20 to i8
  store i8 %21, ptr getelementptr inbounds ([19 x i8], ptr @regValues, i64 0, i64 12), align 4, !tbaa !9
  br label %27

22:                                               ; preds = %12
  %23 = load i8, ptr getelementptr inbounds ([19 x i8], ptr @regValues, i64 0, i64 12), align 4, !tbaa !9
  %24 = zext i8 %23 to i32
  %25 = or i32 %24, 6
  %26 = trunc i32 %25 to i8
  store i8 %26, ptr getelementptr inbounds ([19 x i8], ptr @regValues, i64 0, i64 12), align 4, !tbaa !9
  br label %27

27:                                               ; preds = %22, %16
  br label %28

28:                                               ; preds = %27, %7
  store ptr inttoptr (i64 12582916 to ptr), ptr %3, align 8, !tbaa !10
  %29 = load i8, ptr getelementptr inbounds ([19 x i8], ptr @regValues, i64 0, i64 12), align 4, !tbaa !9
  %30 = zext i8 %29 to i32
  %31 = or i32 35840, %30
  %32 = trunc i32 %31 to i16
  %33 = load ptr, ptr %3, align 8, !tbaa !10
  store volatile i16 %32, ptr %33, align 2, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  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 = !{!"short", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = !{!11, !11, i64 0}
!11 = !{!"any pointer", !7, 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"

@regValues = external hidden local_unnamed_addr global [19 x i8], align 16

; Function Attrs: nofree norecurse nounwind uwtable
define dso_local void @VDP_setScanMode(i16 noundef zeroext %0) local_unnamed_addr #0 {
  %2 = load i8, ptr getelementptr inbounds (i8, ptr @regValues, i64 12), align 4, !tbaa !5
  switch i16 %0, label %8 [
    i16 0, label %3
    i16 1, label %5
  ]

3:                                                ; preds = %1
  %4 = and i8 %2, -7
  br label %10

5:                                                ; preds = %1
  %6 = and i8 %2, -7
  %7 = or disjoint i8 %6, 2
  br label %10

8:                                                ; preds = %1
  %9 = or i8 %2, 6
  br label %10

10:                                               ; preds = %5, %8, %3
  %.sink = phi i8 [ %7, %5 ], [ %9, %8 ], [ %4, %3 ]
  store i8 %.sink, ptr getelementptr inbounds (i8, ptr @regValues, i64 12), align 4, !tbaa !5
  %11 = zext i8 %.sink to i16
  %12 = or disjoint i16 %11, -29696
  store volatile i16 %12, ptr inttoptr (i64 12582916 to ptr), align 4, !tbaa !8
  ret void
}

attributes #0 = { nofree norecurse 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"short", !6, i64 0}


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