; LLVM IR from HarshCasper/NeoAlgo :: C/cp (Adjacent_Element_Product)

; 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: nounwind uwtable
define dso_local void @prod_elements(ptr noundef %0, ptr noundef %1, i32 noundef %2) #1 {
  %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
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %8

8:                                                ; preds = %30, %3
  %9 = load i32, ptr %7, align 4, !tbaa !9
  %10 = load i32, ptr %6, align 4, !tbaa !9
  %11 = sub nsw i32 %10, 1
  %12 = icmp slt i32 %9, %11
  br i1 %12, label %13, label %33

13:                                               ; preds = %8
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = load i32, ptr %7, align 4, !tbaa !9
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds i32, ptr %14, i64 %16
  %18 = load i32, ptr %17, align 4, !tbaa !9
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = load i32, ptr %7, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds i32, ptr %19, i64 %21
  %23 = getelementptr inbounds i32, ptr %22, i64 1
  %24 = load i32, ptr %23, align 4, !tbaa !9
  %25 = mul nsw i32 %18, %24
  %26 = load ptr, ptr %4, align 8, !tbaa !5
  %27 = load i32, ptr %7, align 4, !tbaa !9
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds i32, ptr %26, i64 %28
  store i32 %25, ptr %29, align 4, !tbaa !9
  br label %30

30:                                               ; preds = %13
  %31 = load i32, ptr %7, align 4, !tbaa !9
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %7, align 4, !tbaa !9
  br label %8, !llvm.loop !11

33:                                               ; preds = %8
  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.end.p0(i64 immarg, ptr nocapture) #0

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 }

!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 = distinct !{!11, !12}
!12 = !{!"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: nofree norecurse nosync nounwind memory(argmem: readwrite) uwtable
define dso_local void @prod_elements(ptr nocapture noundef writeonly %0, ptr nocapture noundef readonly %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp sgt i32 %2, 1
  br i1 %4, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %3
  %5 = add nsw i32 %2, -1
  %wide.trip.count = zext i32 %5 to i64
  %min.iters.check = icmp ult i32 %2, 13
  br i1 %min.iters.check, label %.lr.ph.preheader14, label %vector.memcheck

vector.memcheck:                                  ; preds = %.lr.ph.preheader
  %6 = shl nuw nsw i64 %wide.trip.count, 2
  %scevgep = getelementptr i8, ptr %0, i64 %6
  %7 = getelementptr i8, ptr %1, i64 %6
  %scevgep10 = getelementptr i8, ptr %7, i64 4
  %bound0 = icmp ugt ptr %scevgep10, %0
  %bound1 = icmp ugt ptr %scevgep, %1
  %found.conflict = and i1 %bound0, %bound1
  br i1 %found.conflict, label %.lr.ph.preheader14, label %vector.ph

vector.ph:                                        ; preds = %vector.memcheck
  %n.vec = and i64 %wide.trip.count, 2147483640
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %8 = getelementptr inbounds i32, ptr %1, i64 %index
  %9 = getelementptr inbounds i8, ptr %8, i64 16
  %wide.load = load <4 x i32>, ptr %8, align 4, !tbaa !5, !alias.scope !9
  %wide.load11 = load <4 x i32>, ptr %9, align 4, !tbaa !5, !alias.scope !9
  %10 = getelementptr inbounds i8, ptr %8, i64 4
  %11 = getelementptr inbounds i8, ptr %8, i64 20
  %wide.load12 = load <4 x i32>, ptr %10, align 4, !tbaa !5, !alias.scope !9
  %wide.load13 = load <4 x i32>, ptr %11, align 4, !tbaa !5, !alias.scope !9
  %12 = mul nsw <4 x i32> %wide.load12, %wide.load
  %13 = mul nsw <4 x i32> %wide.load13, %wide.load11
  %14 = getelementptr inbounds i32, ptr %0, i64 %index
  %15 = getelementptr inbounds i8, ptr %14, i64 16
  store <4 x i32> %12, ptr %14, align 4, !tbaa !5, !alias.scope !12, !noalias !9
  store <4 x i32> %13, ptr %15, align 4, !tbaa !5, !alias.scope !12, !noalias !9
  %index.next = add nuw i64 %index, 8
  %16 = icmp eq i64 %index.next, %n.vec
  br i1 %16, label %middle.block, label %vector.body, !llvm.loop !14

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader14

.lr.ph.preheader14:                               ; preds = %middle.block, %vector.memcheck, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 0, %vector.memcheck ], [ 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.preheader14, %.lr.ph.prol
  %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %.lr.ph.prol ], [ %indvars.iv.ph, %.lr.ph.preheader14 ]
  %prol.iter = phi i64 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader14 ]
  %17 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.prol
  %18 = load i32, ptr %17, align 4, !tbaa !5
  %19 = getelementptr inbounds i8, ptr %17, i64 4
  %20 = load i32, ptr %19, align 4, !tbaa !5
  %21 = mul nsw i32 %20, %18
  %22 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.prol
  store i32 %21, ptr %22, align 4, !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 !18

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader14
  %indvars.iv.unr = phi i64 [ %indvars.iv.ph, %.lr.ph.preheader14 ], [ %indvars.iv.next.prol, %.lr.ph.prol ]
  %23 = sub nsw i64 %indvars.iv.ph, %wide.trip.count
  %24 = icmp ugt i64 %23, -4
  br i1 %24, label %._crit_edge, label %.lr.ph

.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 ]
  %25 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv
  %26 = load i32, ptr %25, align 4, !tbaa !5
  %27 = getelementptr inbounds i8, ptr %25, i64 4
  %28 = load i32, ptr %27, align 4, !tbaa !5
  %29 = mul nsw i32 %28, %26
  %30 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  store i32 %29, ptr %30, align 4, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %31 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.next
  %32 = load i32, ptr %31, align 4, !tbaa !5
  %33 = getelementptr inbounds i8, ptr %31, i64 4
  %34 = load i32, ptr %33, align 4, !tbaa !5
  %35 = mul nsw i32 %34, %32
  %36 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next
  store i32 %35, ptr %36, align 4, !tbaa !5
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %37 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.next.1
  %38 = load i32, ptr %37, align 4, !tbaa !5
  %39 = getelementptr inbounds i8, ptr %37, i64 4
  %40 = load i32, ptr %39, align 4, !tbaa !5
  %41 = mul nsw i32 %40, %38
  %42 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next.1
  store i32 %41, ptr %42, align 4, !tbaa !5
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %43 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.next.2
  %44 = load i32, ptr %43, align 4, !tbaa !5
  %45 = getelementptr inbounds i8, ptr %43, i64 4
  %46 = load i32, ptr %45, align 4, !tbaa !5
  %47 = mul nsw i32 %46, %44
  %48 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next.2
  store i32 %47, ptr %48, align 4, !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 %._crit_edge, label %.lr.ph, !llvm.loop !20

._crit_edge:                                      ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %middle.block, %3
  ret void
}

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" }

!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 = distinct !{!10, !11}
!11 = distinct !{!11, !"LVerDomain"}
!12 = !{!13}
!13 = distinct !{!13, !11}
!14 = distinct !{!14, !15, !16, !17}
!15 = !{!"llvm.loop.mustprogress"}
!16 = !{!"llvm.loop.isvectorized", i32 1}
!17 = !{!"llvm.loop.unroll.runtime.disable"}
!18 = distinct !{!18, !19}
!19 = !{!"llvm.loop.unroll.disable"}
!20 = distinct !{!20, !15, !16}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass