; LLVM IR from niessner/Matterport :: code/gaps/pkgs/R3Shapes/R3Grid.ll (ZNK6R3Grid8VarianceEv)

; 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.R3Grid = type { %class.R3Affine, %class.R3Affine, double, double, ptr, [3 x i32], i32, i32, i32 }
%class.R3Affine = type { %class.R3Transformation, %class.R4Matrix, %class.R4Matrix, %class.RNFlags }
%class.R3Transformation = type { ptr }
%class.R4Matrix = type { [4 x [4 x double]] }
%class.RNFlags = type { i64 }

; 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: mustprogress uwtable
define dso_local noundef double @_ZNK6R3Grid8VarianceEv(ptr noundef nonnull align 8 dereferenceable(592) %0) #1 align 2 {
  %2 = alloca ptr, align 8
  %3 = alloca double, align 8
  %4 = alloca double, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca double, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  %8 = load ptr, ptr %2, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #4
  store double 0.000000e+00, ptr %3, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #4
  %9 = call noundef double @_ZNK6R3Grid4MeanEv(ptr noundef nonnull align 8 dereferenceable(592) %8)
  store double %9, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #4
  %10 = getelementptr inbounds %class.R3Grid, ptr %8, i32 0, i32 4
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  store ptr %11, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #4
  store i32 0, ptr %6, align 4, !tbaa !19
  br label %12

12:                                               ; preds = %28, %1
  %13 = load i32, ptr %6, align 4, !tbaa !19
  %14 = getelementptr inbounds %class.R3Grid, ptr %8, i32 0, i32 8
  %15 = load i32, ptr %14, align 4, !tbaa !20
  %16 = icmp slt i32 %13, %15
  br i1 %16, label %18, label %17

17:                                               ; preds = %12
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  br label %31

18:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #4
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = getelementptr inbounds double, ptr %19, i32 1
  store ptr %20, ptr %5, align 8, !tbaa !5
  %21 = load double, ptr %19, align 8, !tbaa !9
  %22 = load double, ptr %4, align 8, !tbaa !9
  %23 = fsub double %21, %22
  store double %23, ptr %7, align 8, !tbaa !9
  %24 = load double, ptr %7, align 8, !tbaa !9
  %25 = load double, ptr %7, align 8, !tbaa !9
  %26 = load double, ptr %3, align 8, !tbaa !9
  %27 = call double @llvm.fmuladd.f64(double %24, double %25, double %26)
  store double %27, ptr %3, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #4
  br label %28

28:                                               ; preds = %18
  %29 = load i32, ptr %6, align 4, !tbaa !19
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %6, align 4, !tbaa !19
  br label %12, !llvm.loop !21

31:                                               ; preds = %17
  %32 = load double, ptr %3, align 8, !tbaa !9
  %33 = getelementptr inbounds %class.R3Grid, ptr %8, i32 0, i32 8
  %34 = load i32, ptr %33, align 4, !tbaa !20
  %35 = sitofp i32 %34 to double
  %36 = fdiv double %32, %35
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #4
  ret double %36
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef double @_ZNK6R3Grid4MeanEv(ptr noundef nonnull align 8 dereferenceable(592)) #2 align 2

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.fmuladd.f64(double, double, double) #3

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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" }
attributes #2 = { inlinehint 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 #3 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #4 = { 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 = !{!"double", !7, i64 0}
!11 = !{!12, !6, i64 560}
!12 = !{!"_ZTS6R3Grid", !13, i64 0, !13, i64 272, !10, i64 544, !10, i64 552, !6, i64 560, !7, i64 568, !18, i64 580, !18, i64 584, !18, i64 588}
!13 = !{!"_ZTS8R3Affine", !14, i64 0, !15, i64 8, !15, i64 136, !16, i64 264}
!14 = !{!"_ZTS16R3Transformation"}
!15 = !{!"_ZTS8R4Matrix", !7, i64 0}
!16 = !{!"_ZTS7RNFlags", !17, i64 0}
!17 = !{!"long", !7, i64 0}
!18 = !{!"int", !7, i64 0}
!19 = !{!18, !18, i64 0}
!20 = !{!12, !18, i64 588}
!21 = distinct !{!21, !22}
!22 = !{!"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: mustprogress nounwind uwtable
define dso_local noundef double @_ZNK6R3Grid8VarianceEv(ptr noundef nonnull align 8 dereferenceable(592) %0) local_unnamed_addr #0 align 2 {
  %2 = tail call noundef double @_ZNK6R3Grid4MeanEv(ptr noundef nonnull align 8 dereferenceable(592) %0)
  %3 = getelementptr inbounds i8, ptr %0, i64 588
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %5 = icmp sgt i32 %4, 0
  br i1 %5, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %1
  %6 = getelementptr inbounds i8, ptr %0, i64 560
  %7 = load ptr, ptr %6, align 8, !tbaa !17
  %xtraiter = and i32 %4, 3
  %8 = icmp ult i32 %4, 4
  br i1 %8, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i32 %4, 2147483644
  br label %.lr.ph

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %.lcssa.ph = phi double [ poison, %.lr.ph.preheader ], [ %30, %.lr.ph ]
  %.013.unr = phi double [ 0.000000e+00, %.lr.ph.preheader ], [ %30, %.lr.ph ]
  %.0911.unr = phi ptr [ %7, %.lr.ph.preheader ], [ %27, %.lr.ph ]
  %lcmp.mod.not = icmp eq i32 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil
  %.013.epil = phi double [ %12, %.lr.ph.epil ], [ %.013.unr, %._crit_edge.loopexit.unr-lcssa ]
  %.0911.epil = phi ptr [ %9, %.lr.ph.epil ], [ %.0911.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i32 [ %epil.iter.next, %.lr.ph.epil ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %9 = getelementptr inbounds i8, ptr %.0911.epil, i64 8
  %10 = load double, ptr %.0911.epil, align 8, !tbaa !18
  %11 = fsub double %10, %2
  %12 = tail call double @llvm.fmuladd.f64(double %11, double %11, double %.013.epil)
  %epil.iter.next = add i32 %epil.iter, 1
  %epil.iter.cmp.not = icmp eq i32 %epil.iter.next, %xtraiter
  br i1 %epil.iter.cmp.not, label %._crit_edge, label %.lr.ph.epil, !llvm.loop !19

._crit_edge:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil, %1
  %.0.lcssa = phi double [ 0.000000e+00, %1 ], [ %.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %12, %.lr.ph.epil ]
  %13 = sitofp i32 %4 to double
  %14 = fdiv double %.0.lcssa, %13
  ret double %14

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %.013 = phi double [ 0.000000e+00, %.lr.ph.preheader.new ], [ %30, %.lr.ph ]
  %.0911 = phi ptr [ %7, %.lr.ph.preheader.new ], [ %27, %.lr.ph ]
  %niter = phi i32 [ 0, %.lr.ph.preheader.new ], [ %niter.next.3, %.lr.ph ]
  %15 = getelementptr inbounds i8, ptr %.0911, i64 8
  %16 = load double, ptr %.0911, align 8, !tbaa !18
  %17 = fsub double %16, %2
  %18 = tail call double @llvm.fmuladd.f64(double %17, double %17, double %.013)
  %19 = getelementptr inbounds i8, ptr %.0911, i64 16
  %20 = load double, ptr %15, align 8, !tbaa !18
  %21 = fsub double %20, %2
  %22 = tail call double @llvm.fmuladd.f64(double %21, double %21, double %18)
  %23 = getelementptr inbounds i8, ptr %.0911, i64 24
  %24 = load double, ptr %19, align 8, !tbaa !18
  %25 = fsub double %24, %2
  %26 = tail call double @llvm.fmuladd.f64(double %25, double %25, double %22)
  %27 = getelementptr inbounds i8, ptr %.0911, i64 32
  %28 = load double, ptr %23, align 8, !tbaa !18
  %29 = fsub double %28, %2
  %30 = tail call double @llvm.fmuladd.f64(double %29, double %29, double %26)
  %niter.next.3 = add i32 %niter, 4
  %niter.ncmp.3 = icmp eq i32 %niter.next.3, %unroll_iter
  br i1 %niter.ncmp.3, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !21
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef double @_ZNK6R3Grid4MeanEv(ptr noundef nonnull align 8 dereferenceable(592)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.fmuladd.f64(double, double, double) #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 = { inlinehint 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 #2 = { mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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, !16, i64 588}
!6 = !{!"_ZTS6R3Grid", !7, i64 0, !7, i64 272, !14, i64 544, !14, i64 552, !15, i64 560, !10, i64 568, !16, i64 580, !16, i64 584, !16, i64 588}
!7 = !{!"_ZTS8R3Affine", !8, i64 0, !9, i64 8, !9, i64 136, !12, i64 264}
!8 = !{!"_ZTS16R3Transformation"}
!9 = !{!"_ZTS8R4Matrix", !10, i64 0}
!10 = !{!"omnipotent char", !11, i64 0}
!11 = !{!"Simple C++ TBAA"}
!12 = !{!"_ZTS7RNFlags", !13, i64 0}
!13 = !{!"long", !10, i64 0}
!14 = !{!"double", !10, i64 0}
!15 = !{!"any pointer", !10, i64 0}
!16 = !{!"int", !10, i64 0}
!17 = !{!6, !15, i64 560}
!18 = !{!14, !14, i64 0}
!19 = distinct !{!19, !20}
!20 = !{!"llvm.loop.unroll.disable"}
!21 = distinct !{!21, !22}
!22 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass