; LLVM IR from adamdempsey90/MultiGrid :: src (matfill)

; 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: nounwind uwtable
define dso_local void @matfill(ptr noundef %0, ptr noundef %1, i32 noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %8 = load ptr, ptr %5, align 8, !tbaa !5
  %9 = icmp eq ptr %8, null
  br i1 %9, label %10, label %24

10:                                               ; preds = %3
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %20, %10
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = load i32, ptr %6, align 4, !tbaa !9
  %14 = icmp slt i32 %12, %13
  br i1 %14, label %15, label %23

15:                                               ; preds = %11
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  %17 = load i32, ptr %7, align 4, !tbaa !9
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds double, ptr %16, i64 %18
  store double 0.000000e+00, ptr %19, align 8, !tbaa !11
  br label %20

20:                                               ; preds = %15
  %21 = load i32, ptr %7, align 4, !tbaa !9
  %22 = add nsw i32 %21, 1
  store i32 %22, ptr %7, align 4, !tbaa !9
  br label %11, !llvm.loop !13

23:                                               ; preds = %11
  br label %43

24:                                               ; preds = %3
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %25

25:                                               ; preds = %39, %24
  %26 = load i32, ptr %7, align 4, !tbaa !9
  %27 = load i32, ptr %6, align 4, !tbaa !9
  %28 = icmp slt i32 %26, %27
  br i1 %28, label %29, label %42

29:                                               ; preds = %25
  %30 = load ptr, ptr %5, align 8, !tbaa !5
  %31 = load i32, ptr %7, align 4, !tbaa !9
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds double, ptr %30, i64 %32
  %34 = load double, ptr %33, align 8, !tbaa !11
  %35 = load ptr, ptr %4, align 8, !tbaa !5
  %36 = load i32, ptr %7, align 4, !tbaa !9
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds double, ptr %35, i64 %37
  store double %34, ptr %38, align 8, !tbaa !11
  br label %39

39:                                               ; preds = %29
  %40 = load i32, ptr %7, align 4, !tbaa !9
  %41 = add nsw i32 %40, 1
  store i32 %41, ptr %7, align 4, !tbaa !9
  br label %25, !llvm.loop !15

42:                                               ; preds = %25
  br label %43

43:                                               ; preds = %42, %23
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"double", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = distinct !{!15, !14}


; 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: nofree norecurse nosync nounwind memory(argmem: readwrite) uwtable
define dso_local void @matfill(ptr nocapture noundef writeonly %0, ptr noundef readonly %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = ptrtoint ptr %1 to i64
  %5 = ptrtoint ptr %0 to i64
  %6 = icmp eq ptr %1, null
  %7 = icmp sgt i32 %2, 0
  br i1 %6, label %.preheader, label %.preheader13

.preheader13:                                     ; preds = %3
  br i1 %7, label %.lr.ph.preheader, label %.loopexit

.lr.ph.preheader:                                 ; preds = %.preheader13
  %wide.trip.count = zext nneg i32 %2 to i64
  %min.iters.check = icmp ult i32 %2, 6
  %8 = sub i64 %5, %4
  %diff.check = icmp ult i64 %8, 32
  %or.cond = or i1 %min.iters.check, %diff.check
  br i1 %or.cond, label %.lr.ph.preheader24, label %vector.ph

.lr.ph.preheader24:                               ; preds = %middle.block, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  %xtraiter = and i64 %wide.trip.count, 3
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol

.lr.ph.prol:                                      ; preds = %.lr.ph.preheader24, %.lr.ph.prol
  %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %.lr.ph.prol ], [ %indvars.iv.ph, %.lr.ph.preheader24 ]
  %prol.iter = phi i64 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader24 ]
  %9 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.prol
  %10 = load double, ptr %9, align 8, !tbaa !5
  %11 = getelementptr inbounds double, ptr %0, i64 %indvars.iv.prol
  store double %10, ptr %11, align 8, !tbaa !5
  %indvars.iv.next.prol = add nuw nsw i64 %indvars.iv.prol, 1
  %prol.iter.next = add i64 %prol.iter, 1
  %prol.iter.cmp.not = icmp eq i64 %prol.iter.next, %xtraiter
  br i1 %prol.iter.cmp.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol, !llvm.loop !9

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader24
  %indvars.iv.unr = phi i64 [ %indvars.iv.ph, %.lr.ph.preheader24 ], [ %indvars.iv.next.prol, %.lr.ph.prol ]
  %12 = sub nsw i64 %indvars.iv.ph, %wide.trip.count
  %13 = icmp ugt i64 %12, -4
  br i1 %13, label %.loopexit, label %.lr.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %wide.trip.count, 2147483644
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %14 = getelementptr inbounds double, ptr %1, i64 %index
  %15 = getelementptr inbounds i8, ptr %14, i64 16
  %wide.load = load <2 x double>, ptr %14, align 8, !tbaa !5
  %wide.load23 = load <2 x double>, ptr %15, align 8, !tbaa !5
  %16 = getelementptr inbounds double, ptr %0, i64 %index
  %17 = getelementptr inbounds i8, ptr %16, i64 16
  store <2 x double> %wide.load, ptr %16, align 8, !tbaa !5
  store <2 x double> %wide.load23, ptr %17, align 8, !tbaa !5
  %index.next = add nuw i64 %index, 4
  %18 = icmp eq i64 %index.next, %n.vec
  br i1 %18, label %middle.block, label %vector.body, !llvm.loop !11

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %.loopexit, label %.lr.ph.preheader24

.preheader:                                       ; preds = %3
  br i1 %7, label %.lr.ph17.preheader, label %.loopexit

.lr.ph17.preheader:                               ; preds = %.preheader
  %19 = zext nneg i32 %2 to i64
  %20 = shl nuw nsw i64 %19, 3
  tail call void @llvm.memset.p0.i64(ptr align 8 %0, i8 0, i64 %20, i1 false), !tbaa !5
  br label %.loopexit

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next.3, %.lr.ph ], [ %indvars.iv.unr, %.lr.ph.prol.loopexit ]
  %21 = getelementptr inbounds double, ptr %1, i64 %indvars.iv
  %22 = load double, ptr %21, align 8, !tbaa !5
  %23 = getelementptr inbounds double, ptr %0, i64 %indvars.iv
  store double %22, ptr %23, align 8, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %24 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.next
  %25 = load double, ptr %24, align 8, !tbaa !5
  %26 = getelementptr inbounds double, ptr %0, i64 %indvars.iv.next
  store double %25, ptr %26, align 8, !tbaa !5
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %27 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.next.1
  %28 = load double, ptr %27, align 8, !tbaa !5
  %29 = getelementptr inbounds double, ptr %0, i64 %indvars.iv.next.1
  store double %28, ptr %29, align 8, !tbaa !5
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %30 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.next.2
  %31 = load double, ptr %30, align 8, !tbaa !5
  %32 = getelementptr inbounds double, ptr %0, i64 %indvars.iv.next.2
  store double %31, ptr %32, align 8, !tbaa !5
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %exitcond.not.3 = icmp eq i64 %indvars.iv.next.3, %wide.trip.count
  br i1 %exitcond.not.3, label %.loopexit, label %.lr.ph, !llvm.loop !15

.loopexit:                                        ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %middle.block, %.lr.ph17.preheader, %.preheader13, %.preheader
  ret void
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: readwrite) 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 = { nocallback nofree nounwind willreturn memory(argmem: write) }

!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 = !{!"double", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.unroll.disable"}
!11 = distinct !{!11, !12, !13, !14}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!"llvm.loop.isvectorized", i32 1}
!14 = !{!"llvm.loop.unroll.runtime.disable"}
!15 = distinct !{!15, !12, !13}


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