; LLVM IR from Stephane-D/SGDK :: src (ym2612)

; 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: nounwind uwtable
define dso_local void @YM2612_write(i16 noundef zeroext %0, i8 noundef zeroext %1) #1 {
  %3 = alloca i16, align 2
  %4 = alloca i8, align 1
  %5 = alloca ptr, align 8
  store i16 %0, ptr %3, align 2, !tbaa !5
  store i8 %1, ptr %4, align 1, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store ptr inttoptr (i64 10502144 to ptr), ptr %5, align 8, !tbaa !10
  br label %6

6:                                                ; preds = %11, %2
  %7 = load ptr, ptr %5, align 8, !tbaa !10
  %8 = load volatile i8, ptr %7, align 1, !tbaa !9
  %9 = sext i8 %8 to i32
  %10 = icmp slt i32 %9, 0
  br i1 %10, label %11, label %12

11:                                               ; preds = %6
  br label %6, !llvm.loop !12

12:                                               ; preds = %6
  %13 = load i8, ptr %4, align 1, !tbaa !9
  %14 = load ptr, ptr %5, align 8, !tbaa !10
  %15 = load i16, ptr %3, align 2, !tbaa !5
  %16 = zext i16 %15 to i32
  %17 = and i32 %16, 3
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds i8, ptr %14, i64 %18
  store volatile i8 %13, ptr %19, align 1, !tbaa !9
  call void asm sideeffect "nop", "~{dirflag},~{fpsr},~{flags}"() #2, !srcloc !14
  call void asm sideeffect "nop", "~{dirflag},~{fpsr},~{flags}"() #2, !srcloc !15
  call void asm sideeffect "nop", "~{dirflag},~{fpsr},~{flags}"() #2, !srcloc !16
  call void asm sideeffect "nop", "~{dirflag},~{fpsr},~{flags}"() #2, !srcloc !17
  call void asm sideeffect "nop", "~{dirflag},~{fpsr},~{flags}"() #2, !srcloc !18
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

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}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = !{i64 3017}
!15 = !{i64 3044}
!16 = !{i64 3071}
!17 = !{i64 3098}
!18 = !{i64 3125}


; 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 @YM2612_write(i16 noundef zeroext %0, i8 noundef zeroext %1) local_unnamed_addr #0 {
  br label %3

3:                                                ; preds = %3, %2
  %4 = load volatile i8, ptr inttoptr (i64 10502144 to ptr), align 16384, !tbaa !5
  %5 = icmp slt i8 %4, 0
  br i1 %5, label %3, label %6, !llvm.loop !8

6:                                                ; preds = %3
  %7 = and i16 %0, 3
  %8 = zext nneg i16 %7 to i64
  %9 = getelementptr inbounds i8, ptr inttoptr (i64 10502144 to ptr), i64 %8
  store volatile i8 %1, ptr %9, align 1, !tbaa !5
  tail call void asm sideeffect "nop", "~{dirflag},~{fpsr},~{flags}"() #1, !srcloc !10
  tail call void asm sideeffect "nop", "~{dirflag},~{fpsr},~{flags}"() #1, !srcloc !11
  tail call void asm sideeffect "nop", "~{dirflag},~{fpsr},~{flags}"() #1, !srcloc !12
  tail call void asm sideeffect "nop", "~{dirflag},~{fpsr},~{flags}"() #1, !srcloc !13
  tail call void asm sideeffect "nop", "~{dirflag},~{fpsr},~{flags}"() #1, !srcloc !14
  ret void
}

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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}
!10 = !{i64 3017}
!11 = !{i64 3044}
!12 = !{i64 3071}
!13 = !{i64 3098}
!14 = !{i64 3125}


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