; LLVM IR from tessarin/dither :: src (main)

; 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"

%struct.DTPalette = type { i32, ptr }
%struct.DTPixel = type { i8, i8, i8 }

@.str.16 = external hidden unnamed_addr constant [10 x i8], align 1

; 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 ptr @ReadPaletteFromStdin(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #4
  %8 = call noalias ptr @malloc(i64 noundef 16) #5
  store ptr %8, ptr %3, align 8, !tbaa !9
  %9 = load i32, ptr %2, align 4, !tbaa !5
  %10 = load ptr, ptr %3, align 8, !tbaa !9
  %11 = getelementptr inbounds %struct.DTPalette, ptr %10, i32 0, i32 0
  store i32 %9, ptr %11, align 8, !tbaa !11
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = mul i64 3, %13
  %15 = call noalias ptr @malloc(i64 noundef %14) #5
  %16 = load ptr, ptr %3, align 8, !tbaa !9
  %17 = getelementptr inbounds %struct.DTPalette, ptr %16, i32 0, i32 1
  store ptr %15, ptr %17, align 8, !tbaa !13
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  store i32 0, ptr %7, align 4, !tbaa !5
  br label %18

18:                                               ; preds = %52, %1
  %19 = load i32, ptr %7, align 4, !tbaa !5
  %20 = load i32, ptr %2, align 4, !tbaa !5
  %21 = icmp slt i32 %19, %20
  br i1 %21, label %23, label %22

22:                                               ; preds = %18
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  br label %55

23:                                               ; preds = %18
  %24 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.16, ptr noundef %4, ptr noundef %5, ptr noundef %6)
  %25 = load i32, ptr %4, align 4, !tbaa !5
  %26 = trunc i32 %25 to i8
  %27 = load ptr, ptr %3, align 8, !tbaa !9
  %28 = getelementptr inbounds %struct.DTPalette, ptr %27, i32 0, i32 1
  %29 = load ptr, ptr %28, align 8, !tbaa !13
  %30 = load i32, ptr %7, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds %struct.DTPixel, ptr %29, i64 %31
  %33 = getelementptr inbounds %struct.DTPixel, ptr %32, i32 0, i32 0
  store i8 %26, ptr %33, align 1, !tbaa !14
  %34 = load i32, ptr %5, align 4, !tbaa !5
  %35 = trunc i32 %34 to i8
  %36 = load ptr, ptr %3, align 8, !tbaa !9
  %37 = getelementptr inbounds %struct.DTPalette, ptr %36, i32 0, i32 1
  %38 = load ptr, ptr %37, align 8, !tbaa !13
  %39 = load i32, ptr %7, align 4, !tbaa !5
  %40 = sext i32 %39 to i64
  %41 = getelementptr inbounds %struct.DTPixel, ptr %38, i64 %40
  %42 = getelementptr inbounds %struct.DTPixel, ptr %41, i32 0, i32 1
  store i8 %35, ptr %42, align 1, !tbaa !16
  %43 = load i32, ptr %6, align 4, !tbaa !5
  %44 = trunc i32 %43 to i8
  %45 = load ptr, ptr %3, align 8, !tbaa !9
  %46 = getelementptr inbounds %struct.DTPalette, ptr %45, i32 0, i32 1
  %47 = load ptr, ptr %46, align 8, !tbaa !13
  %48 = load i32, ptr %7, align 4, !tbaa !5
  %49 = sext i32 %48 to i64
  %50 = getelementptr inbounds %struct.DTPixel, ptr %47, i64 %49
  %51 = getelementptr inbounds %struct.DTPixel, ptr %50, i32 0, i32 2
  store i8 %44, ptr %51, align 1, !tbaa !17
  br label %52

52:                                               ; preds = %23
  %53 = load i32, ptr %7, align 4, !tbaa !5
  %54 = add nsw i32 %53, 1
  store i32 %54, ptr %7, align 4, !tbaa !5
  br label %18, !llvm.loop !18

55:                                               ; preds = %22
  %56 = load ptr, ptr %3, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #4
  ret ptr %56
}

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

declare i32 @__isoc99_scanf(ptr noundef, ...) #3

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 allocsize(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 #3 = { "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 #4 = { nounwind }
attributes #5 = { nounwind allocsize(0) }

!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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !6, i64 0}
!12 = !{!"", !6, i64 0, !10, i64 8}
!13 = !{!12, !10, i64 8}
!14 = !{!15, !7, i64 0}
!15 = !{!"", !7, i64 0, !7, i64 1, !7, i64 2}
!16 = !{!15, !7, i64 1}
!17 = !{!15, !7, i64 2}
!18 = distinct !{!18, !19}
!19 = !{!"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"

%struct.DTPixel = type { i8, i8, i8 }

@.str.16 = external hidden unnamed_addr constant [10 x i8], align 1

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

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

; Function Attrs: nofree nounwind uwtable
define dso_local noalias noundef ptr @ReadPaletteFromStdin(i32 noundef %0) local_unnamed_addr #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = tail call noalias dereferenceable_or_null(16) ptr @malloc(i64 noundef 16) #4
  store i32 %0, ptr %5, align 8, !tbaa !5
  %6 = sext i32 %0 to i64
  %7 = mul nsw i64 %6, 3
  %8 = tail call noalias ptr @malloc(i64 noundef %7) #4
  %9 = getelementptr inbounds i8, ptr %5, i64 8
  store ptr %8, ptr %9, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #5
  %10 = icmp sgt i32 %0, 0
  br i1 %10, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %1
  %wide.trip.count = zext nneg i32 %0 to i64
  br label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %1
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #5
  ret ptr %5

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %.lr.ph ]
  %11 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.16, ptr noundef nonnull %2, ptr noundef nonnull %3, ptr noundef nonnull %4)
  %12 = load i32, ptr %2, align 4, !tbaa !12
  %13 = trunc i32 %12 to i8
  %14 = getelementptr inbounds %struct.DTPixel, ptr %8, i64 %indvars.iv
  store i8 %13, ptr %14, align 1, !tbaa !13
  %15 = load i32, ptr %3, align 4, !tbaa !12
  %16 = trunc i32 %15 to i8
  %17 = getelementptr inbounds %struct.DTPixel, ptr %8, i64 %indvars.iv, i32 1
  store i8 %16, ptr %17, align 1, !tbaa !15
  %18 = load i32, ptr %4, align 4, !tbaa !12
  %19 = trunc i32 %18 to i8
  %20 = getelementptr inbounds %struct.DTPixel, ptr %8, i64 %indvars.iv, i32 2
  store i8 %19, ptr %20, align 1, !tbaa !16
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !17
}

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #3

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nofree 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 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { nofree nounwind "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 #4 = { nounwind allocsize(0) }
attributes #5 = { 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, !7, i64 0}
!6 = !{!"", !7, i64 0, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !10, i64 8}
!12 = !{!7, !7, i64 0}
!13 = !{!14, !8, i64 0}
!14 = !{!"", !8, i64 0, !8, i64 1, !8, i64 2}
!15 = !{!14, !8, i64 1}
!16 = !{!14, !8, i64 2}
!17 = distinct !{!17, !18}
!18 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass