; LLVM IR from clibraries/array-algorithms :: test (impl)

; 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 ptr @intv_copy_backward(ptr noundef %0, ptr noundef %1, ptr noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store ptr %2, ptr %6, align 8, !tbaa !5
  br label %7

7:                                                ; preds = %11, %3
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  %9 = load ptr, ptr %5, align 8, !tbaa !5
  %10 = icmp ne ptr %8, %9
  br i1 %10, label %11, label %19

11:                                               ; preds = %7
  %12 = load ptr, ptr %5, align 8, !tbaa !5
  %13 = getelementptr inbounds i32, ptr %12, i32 -1
  store ptr %13, ptr %5, align 8, !tbaa !5
  %14 = load ptr, ptr %6, align 8, !tbaa !5
  %15 = getelementptr inbounds i32, ptr %14, i32 -1
  store ptr %15, ptr %6, align 8, !tbaa !5
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = load i32, ptr %16, align 4, !tbaa !9
  %18 = load ptr, ptr %6, align 8, !tbaa !5
  store i32 %17, ptr %18, align 4, !tbaa !9
  br label %7, !llvm.loop !11

19:                                               ; preds = %7
  %20 = load ptr, ptr %6, align 8, !tbaa !5
  ret ptr %20
}

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" }

!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(readwrite, inaccessiblemem: none) uwtable
define dso_local noundef ptr @intv_copy_backward(ptr noundef readnone %0, ptr noundef readonly %1, ptr noundef writeonly %2) local_unnamed_addr #0 {
  %.not8 = icmp eq ptr %1, %0
  br i1 %.not8, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %4 = ptrtoint ptr %1 to i64
  %5 = ptrtoint ptr %2 to i64
  %6 = ptrtoint ptr %1 to i64
  %7 = ptrtoint ptr %0 to i64
  %8 = add i64 %6, -4
  %9 = sub i64 %8, %7
  %10 = lshr i64 %9, 2
  %11 = add nuw nsw i64 %10, 1
  %min.iters.check = icmp ult i64 %9, 28
  %12 = sub i64 %4, %5
  %diff.check = icmp ult i64 %12, 32
  %or.cond = or i1 %min.iters.check, %diff.check
  br i1 %or.cond, label %.lr.ph.preheader22, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %11, 9223372036854775800
  %13 = mul i64 %n.vec, -4
  %ind.end = getelementptr i8, ptr %2, i64 %13
  %14 = mul i64 %n.vec, -4
  %ind.end12 = getelementptr i8, ptr %1, i64 %14
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %offset.idx = mul i64 %index, -4
  %next.gep = getelementptr i8, ptr %2, i64 %offset.idx
  %offset.idx15 = mul i64 %index, -4
  %next.gep16 = getelementptr i8, ptr %1, i64 %offset.idx15
  %15 = getelementptr inbounds i8, ptr %next.gep16, i64 -16
  %16 = getelementptr inbounds i8, ptr %next.gep16, i64 -32
  %wide.load = load <4 x i32>, ptr %15, align 4, !tbaa !5
  %wide.load18 = load <4 x i32>, ptr %16, align 4, !tbaa !5
  %17 = getelementptr inbounds i8, ptr %next.gep, i64 -16
  %18 = getelementptr inbounds i8, ptr %next.gep, i64 -32
  store <4 x i32> %wide.load, ptr %17, align 4, !tbaa !5
  store <4 x i32> %wide.load18, ptr %18, align 4, !tbaa !5
  %index.next = add nuw i64 %index, 8
  %19 = icmp eq i64 %index.next, %n.vec
  br i1 %19, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %11, %n.vec
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader22

.lr.ph.preheader22:                               ; preds = %middle.block, %.lr.ph.preheader
  %.010.ph = phi ptr [ %2, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  %.079.ph = phi ptr [ %1, %.lr.ph.preheader ], [ %ind.end12, %middle.block ]
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader22, %.lr.ph
  %.010 = phi ptr [ %21, %.lr.ph ], [ %.010.ph, %.lr.ph.preheader22 ]
  %.079 = phi ptr [ %20, %.lr.ph ], [ %.079.ph, %.lr.ph.preheader22 ]
  %20 = getelementptr inbounds i8, ptr %.079, i64 -4
  %21 = getelementptr inbounds i8, ptr %.010, i64 -4
  %22 = load i32, ptr %20, align 4, !tbaa !5
  store i32 %22, ptr %21, align 4, !tbaa !5
  %.not = icmp eq ptr %20, %0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph, %middle.block, %3
  %.0.lcssa = phi ptr [ %2, %3 ], [ %ind.end, %middle.block ], [ %21, %.lr.ph ]
  ret ptr %.0.lcssa
}

attributes #0 = { nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) 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 = distinct !{!9, !10, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !11}


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