; LLVM IR from niessner/Matterport :: code/gaps/pkgs/R3Shapes/R3Mesh.ll (ZN6R3Mesh9FlipFacesEv)

; 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: inlinehint mustprogress uwtable
declare dso_local noundef i32 @_ZNK6R3Mesh6NFacesEv(ptr noundef nonnull align 8 dereferenceable(272)) #1 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef ptr @_ZNK6R3Mesh4FaceEi(ptr noundef nonnull align 8 dereferenceable(272), i32 noundef) #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN6R3Mesh9FlipFacesEv(ptr noundef nonnull align 8 dereferenceable(272) %0) #2 align 2 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %5 = load ptr, ptr %2, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %18, %1
  %7 = load i32, ptr %3, align 4, !tbaa !9
  %8 = call noundef i32 @_ZNK6R3Mesh6NFacesEv(ptr noundef nonnull align 8 dereferenceable(272) %5)
  %9 = icmp slt i32 %7, %8
  br i1 %9, label %11, label %10

10:                                               ; preds = %6
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %21

11:                                               ; preds = %6
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %12 = load i32, ptr %3, align 4, !tbaa !9
  %13 = call noundef ptr @_ZNK6R3Mesh4FaceEi(ptr noundef nonnull align 8 dereferenceable(272) %5, i32 noundef %12)
  store ptr %13, ptr %4, align 8, !tbaa !5
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = load ptr, ptr %5, align 8, !tbaa !11
  %16 = getelementptr inbounds ptr, ptr %15, i64 28
  %17 = load ptr, ptr %16, align 8
  call void %17(ptr noundef nonnull align 8 dereferenceable(272) %5, ptr noundef %14)
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  br label %18

18:                                               ; preds = %11
  %19 = load i32, ptr %3, align 4, !tbaa !9
  %20 = add nsw i32 %19, 1
  store i32 %20, ptr %3, align 4, !tbaa !9
  br label %6, !llvm.loop !13

21:                                               ; preds = %10
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { inlinehint mustprogress 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 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 #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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"vtable pointer", !8, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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: inlinehint mustprogress uwtable
declare dso_local noundef i32 @_ZNK6R3Mesh6NFacesEv(ptr noundef nonnull align 8 dereferenceable(272)) local_unnamed_addr #0 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef ptr @_ZNK6R3Mesh4FaceEi(ptr noundef nonnull align 8 dereferenceable(272), i32 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_ZN6R3Mesh9FlipFacesEv(ptr noundef nonnull align 8 dereferenceable(272) %0) local_unnamed_addr #1 align 2 {
  %2 = tail call noundef i32 @_ZNK6R3Mesh6NFacesEv(ptr noundef nonnull align 8 dereferenceable(272) %0)
  %3 = icmp sgt i32 %2, 0
  br i1 %3, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %1
  ret void

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.04 = phi i32 [ %8, %.lr.ph ], [ 0, %1 ]
  %4 = tail call noundef ptr @_ZNK6R3Mesh4FaceEi(ptr noundef nonnull align 8 dereferenceable(272) %0, i32 noundef %.04)
  %5 = load ptr, ptr %0, align 8, !tbaa !5
  %6 = getelementptr inbounds i8, ptr %5, i64 224
  %7 = load ptr, ptr %6, align 8
  tail call void %7(ptr noundef nonnull align 8 dereferenceable(272) %0, ptr noundef %4)
  %8 = add nuw nsw i32 %.04, 1
  %9 = tail call noundef i32 @_ZNK6R3Mesh6NFacesEv(ptr noundef nonnull align 8 dereferenceable(272) %0)
  %10 = icmp slt i32 %8, %9
  br i1 %10, label %.lr.ph, label %._crit_edge, !llvm.loop !8
}

attributes #0 = { inlinehint mustprogress 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 = { mustprogress 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 = !{!"vtable pointer", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


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