; LLVM IR from Stephane-D/SGDK :: src (z80_ctrl)

; 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 zeroext i8 @Z80_getAndRequestBus(i8 noundef zeroext %0) #1 {
  %2 = alloca i8, align 1
  %3 = alloca i8, align 1
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  store i8 %0, ptr %3, align 1, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store ptr inttoptr (i64 10555648 to ptr), ptr %4, align 8, !tbaa !8
  %7 = load ptr, ptr %4, align 8, !tbaa !8
  %8 = load volatile i16, ptr %7, align 2, !tbaa !10
  %9 = zext i16 %8 to i32
  %10 = and i32 %9, 256
  %11 = icmp ne i32 %10, 0
  br i1 %11, label %13, label %12

12:                                               ; preds = %1
  store i8 1, ptr %2, align 1
  store i32 1, ptr %6, align 4
  br label %28

13:                                               ; preds = %1
  store ptr inttoptr (i64 10555904 to ptr), ptr %5, align 8, !tbaa !8
  %14 = load ptr, ptr %4, align 8, !tbaa !8
  store volatile i16 256, ptr %14, align 2, !tbaa !10
  %15 = load ptr, ptr %5, align 8, !tbaa !8
  store volatile i16 256, ptr %15, align 2, !tbaa !10
  %16 = load i8, ptr %3, align 1, !tbaa !5
  %17 = icmp ne i8 %16, 0
  br i1 %17, label %18, label %27

18:                                               ; preds = %13
  br label %19

19:                                               ; preds = %25, %18
  %20 = load ptr, ptr %4, align 8, !tbaa !8
  %21 = load volatile i16, ptr %20, align 2, !tbaa !10
  %22 = zext i16 %21 to i32
  %23 = and i32 %22, 256
  %24 = icmp ne i32 %23, 0
  br i1 %24, label %25, label %26

25:                                               ; preds = %19
  br label %19, !llvm.loop !12

26:                                               ; preds = %19
  br label %27

27:                                               ; preds = %26, %13
  store i8 0, ptr %2, align 1
  store i32 1, ptr %6, align 4
  br label %28

28:                                               ; preds = %27, %12
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %29 = load i8, ptr %2, align 1
  ret i8 %29
}

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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = !{!9, !9, i64 0}
!9 = !{!"any pointer", !6, i64 0}
!10 = !{!11, !11, i64 0}
!11 = !{!"short", !6, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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: nofree norecurse nounwind uwtable
define dso_local zeroext range(i8 0, 2) i8 @Z80_getAndRequestBus(i8 noundef zeroext %0) local_unnamed_addr #0 {
  %2 = load volatile i16, ptr inttoptr (i64 10555648 to ptr), align 256, !tbaa !5
  %3 = and i16 %2, 256
  %.not = icmp eq i16 %3, 0
  br i1 %.not, label %.loopexit, label %4

4:                                                ; preds = %1
  store volatile i16 256, ptr inttoptr (i64 10555648 to ptr), align 256, !tbaa !5
  store volatile i16 256, ptr inttoptr (i64 10555904 to ptr), align 512, !tbaa !5
  %.not5 = icmp eq i8 %0, 0
  br i1 %.not5, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %4, %.preheader
  %5 = load volatile i16, ptr inttoptr (i64 10555648 to ptr), align 256, !tbaa !5
  %6 = and i16 %5, 256
  %.not6 = icmp eq i16 %6, 0
  br i1 %.not6, label %.loopexit, label %.preheader, !llvm.loop !9

.loopexit:                                        ; preds = %.preheader, %4, %1
  %.0 = phi i8 [ 1, %1 ], [ 0, %4 ], [ 0, %.preheader ]
  ret i8 %.0
}

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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GlobalOptPass,IPSCCPPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass