; 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"

@screenHeight = external dso_local global i16, align 2
@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_setScreenHeight240() #1 {
  %1 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %1) #2
  %2 = load volatile i16, ptr inttoptr (i64 12582916 to ptr), align 2, !tbaa !5
  %3 = zext i16 %2 to i32
  %4 = and i32 %3, 1
  %5 = icmp ne i32 %4, 0
  br i1 %5, label %6, label %16

6:                                                ; preds = %0
  %7 = load i8, ptr getelementptr inbounds ([19 x i8], ptr @regValues, i64 0, i64 1), align 1, !tbaa !9
  %8 = zext i8 %7 to i32
  %9 = or i32 %8, 8
  %10 = trunc i32 %9 to i8
  store i8 %10, ptr getelementptr inbounds ([19 x i8], ptr @regValues, i64 0, i64 1), align 1, !tbaa !9
  store i16 240, ptr @screenHeight, align 2, !tbaa !5
  store ptr inttoptr (i64 12582916 to ptr), ptr %1, align 8, !tbaa !10
  %11 = load i8, ptr getelementptr inbounds ([19 x i8], ptr @regValues, i64 0, i64 1), align 1, !tbaa !9
  %12 = zext i8 %11 to i32
  %13 = or i32 33024, %12
  %14 = trunc i32 %13 to i16
  %15 = load ptr, ptr %1, align 8, !tbaa !10
  store volatile i16 %14, ptr %15, align 2, !tbaa !5
  br label %16

16:                                               ; preds = %6, %0
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #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"

@screenHeight = external dso_local local_unnamed_addr global i16, align 2
@regValues = external hidden local_unnamed_addr global [19 x i8], align 16

; Function Attrs: nofree norecurse nounwind uwtable
define dso_local void @VDP_setScreenHeight240() local_unnamed_addr #0 {
  %1 = load volatile i16, ptr inttoptr (i64 12582916 to ptr), align 4, !tbaa !5
  %2 = and i16 %1, 1
  %.not = icmp eq i16 %2, 0
  br i1 %.not, label %8, label %3

3:                                                ; preds = %0
  %4 = load i8, ptr getelementptr inbounds (i8, ptr @regValues, i64 1), align 1, !tbaa !9
  %5 = or i8 %4, 8
  store i8 %5, ptr getelementptr inbounds (i8, ptr @regValues, i64 1), align 1, !tbaa !9
  store i16 240, ptr @screenHeight, align 2, !tbaa !5
  %6 = zext i8 %5 to i16
  %7 = or disjoint i16 %6, -32512
  store volatile i16 %7, ptr inttoptr (i64 12582916 to ptr), align 4, !tbaa !5
  br label %8

8:                                                ; preds = %3, %0
  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 = !{!"short", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!7, !7, i64 0}


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