; LLVM IR from giacomo-ascari/dichotomic-compression :: src/dc/dc-utils/dc-pixel-matrix.ll (ZN15dc_pixel_matrixD2Ev)

; 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"

%class.dc_pixel_matrix = type { ptr, i64, i64 }
%class.dc_pixel = type { i8, i8, i8 }

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN15dc_pixel_matrixD2Ev(ptr noundef nonnull align 8 dereferenceable(24) %0) unnamed_addr #0 align 2 {
  %2 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %3 = load ptr, ptr %2, align 8
  %4 = getelementptr inbounds %class.dc_pixel_matrix, ptr %3, i32 0, i32 0
  %5 = load ptr, ptr %4, align 8, !tbaa !9
  %6 = icmp eq ptr %5, null
  br i1 %6, label %19, label %7

7:                                                ; preds = %1
  %8 = getelementptr inbounds i8, ptr %5, i64 -8
  %9 = load i64, ptr %8, align 1
  %10 = getelementptr inbounds %class.dc_pixel, ptr %5, i64 %9
  %11 = icmp eq ptr %5, %10
  br i1 %11, label %16, label %12

12:                                               ; preds = %12, %7
  %13 = phi ptr [ %10, %7 ], [ %14, %12 ]
  %14 = getelementptr inbounds %class.dc_pixel, ptr %13, i64 -1
  call void @_ZN8dc_pixelD1Ev(ptr noundef nonnull align 1 dereferenceable(3) %14) #3
  %15 = icmp eq ptr %14, %5
  br i1 %15, label %16, label %12

16:                                               ; preds = %12, %7
  %17 = mul i64 3, %9
  %18 = add i64 %17, 8
  call void @_ZdaPvm(ptr noundef %8, i64 noundef %18) #4
  br label %19

19:                                               ; preds = %16, %1
  ret void
}

; Function Attrs: nounwind
declare void @_ZN8dc_pixelD1Ev(ptr noundef nonnull align 1 dereferenceable(3)) unnamed_addr #1

; Function Attrs: nobuiltin nounwind
declare void @_ZdaPvm(ptr noundef, i64 noundef) #2

attributes #0 = { mustprogress 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 "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 = { nobuiltin 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 #3 = { nounwind }
attributes #4 = { builtin 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++ TBAA"}
!9 = !{!10, !6, i64 0}
!10 = !{!"_ZTS15dc_pixel_matrix", !6, i64 0, !11, i64 8, !11, i64 16}
!11 = !{!"long", !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"

%class.dc_pixel = type { i8, i8, i8 }

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_ZN15dc_pixel_matrixD2Ev(ptr nocapture noundef nonnull readonly align 8 dereferenceable(24) %0) unnamed_addr #0 align 2 {
  %2 = load ptr, ptr %0, align 8, !tbaa !5
  %3 = icmp eq ptr %2, null
  br i1 %3, label %14, label %4

4:                                                ; preds = %1
  %5 = getelementptr inbounds i8, ptr %2, i64 -8
  %6 = load i64, ptr %5, align 1
  %7 = icmp eq i64 %6, 0
  br i1 %7, label %.loopexit, label %.preheader.preheader

.preheader.preheader:                             ; preds = %4
  %8 = getelementptr inbounds %class.dc_pixel, ptr %2, i64 %6
  br label %.preheader

.preheader:                                       ; preds = %.preheader.preheader, %.preheader
  %9 = phi ptr [ %10, %.preheader ], [ %8, %.preheader.preheader ]
  %10 = getelementptr inbounds i8, ptr %9, i64 -3
  tail call void @_ZN8dc_pixelD1Ev(ptr noundef nonnull align 1 dereferenceable(3) %10) #3
  %11 = icmp eq ptr %10, %2
  br i1 %11, label %.loopexit, label %.preheader

.loopexit:                                        ; preds = %.preheader, %4
  %12 = mul i64 %6, 3
  %13 = add i64 %12, 8
  tail call void @_ZdaPvm(ptr noundef nonnull %5, i64 noundef %13) #4
  br label %14

14:                                               ; preds = %.loopexit, %1
  ret void
}

; Function Attrs: nounwind
declare void @_ZN8dc_pixelD1Ev(ptr noundef nonnull align 1 dereferenceable(3)) unnamed_addr #1

; Function Attrs: nobuiltin nounwind
declare void @_ZdaPvm(ptr noundef, i64 noundef) local_unnamed_addr #2

attributes #0 = { mustprogress 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 "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 = { nobuiltin 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 #3 = { nounwind }
attributes #4 = { builtin 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 = !{!"_ZTS15dc_pixel_matrix", !7, i64 0, !10, i64 8, !10, i64 16}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"long", !8, i64 0}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InstCombinePass,JumpThreadingPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass