; LLVM IR from BrunoLevy/learn-fpga :: LiteX/software/Doom/mc1-doom/src (v_video)

; 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"

@screens = external dso_local global [5 x ptr], 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 @V_Init() #1 {
  %1 = alloca i32, align 4
  %2 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #3
  %3 = call ptr @I_AllocLow(i32 noundef 256000)
  store ptr %3, ptr %2, align 8, !tbaa !5
  store i32 0, ptr %1, align 4, !tbaa !9
  br label %4

4:                                                ; preds = %17, %0
  %5 = load i32, ptr %1, align 4, !tbaa !9
  %6 = icmp slt i32 %5, 4
  br i1 %6, label %7, label %20

7:                                                ; preds = %4
  %8 = load ptr, ptr %2, align 8, !tbaa !5
  %9 = load i32, ptr %1, align 4, !tbaa !9
  %10 = mul nsw i32 %9, 320
  %11 = mul nsw i32 %10, 200
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds i8, ptr %8, i64 %12
  %14 = load i32, ptr %1, align 4, !tbaa !9
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds [5 x ptr], ptr @screens, i64 0, i64 %15
  store ptr %13, ptr %16, align 8, !tbaa !5
  br label %17

17:                                               ; preds = %7
  %18 = load i32, ptr %1, align 4, !tbaa !9
  %19 = add nsw i32 %18, 1
  store i32 %19, ptr %1, align 4, !tbaa !9
  br label %4, !llvm.loop !11

20:                                               ; preds = %4
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  ret void
}

declare ptr @I_AllocLow(i32 noundef) #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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

@screens = external dso_local local_unnamed_addr global [5 x ptr], align 16

; Function Attrs: nounwind uwtable
define dso_local void @V_Init() local_unnamed_addr #0 {
  %1 = tail call ptr @I_AllocLow(i32 noundef 256000) #2
  store ptr %1, ptr @screens, align 16, !tbaa !5
  %2 = getelementptr inbounds i8, ptr %1, i64 64000
  store ptr %2, ptr getelementptr inbounds (i8, ptr @screens, i64 8), align 8, !tbaa !5
  %3 = getelementptr inbounds i8, ptr %1, i64 128000
  store ptr %3, ptr getelementptr inbounds (i8, ptr @screens, i64 16), align 16, !tbaa !5
  %4 = getelementptr inbounds i8, ptr %1, i64 192000
  store ptr %4, ptr getelementptr inbounds (i8, ptr @screens, i64 24), align 8, !tbaa !5
  ret void
}

declare ptr @I_AllocLow(i32 noundef) local_unnamed_addr #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 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


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