; LLVM IR from zchrissirhcz/pixel :: perfs/array_mean (array_mean)

; 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 float @array_mean_u8_naive(ptr noundef %0, i64 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store i64 0, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  store i64 0, ptr %6, align 8, !tbaa !9
  br label %7

7:                                                ; preds = %20, %2
  %8 = load i64, ptr %6, align 8, !tbaa !9
  %9 = load i64, ptr %4, align 8, !tbaa !9
  %10 = icmp ult i64 %8, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %23

12:                                               ; preds = %7
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = load i64, ptr %6, align 8, !tbaa !9
  %15 = getelementptr inbounds i8, ptr %13, i64 %14
  %16 = load i8, ptr %15, align 1, !tbaa !11
  %17 = zext i8 %16 to i64
  %18 = load i64, ptr %5, align 8, !tbaa !9
  %19 = add i64 %18, %17
  store i64 %19, ptr %5, align 8, !tbaa !9
  br label %20

20:                                               ; preds = %12
  %21 = load i64, ptr %6, align 8, !tbaa !9
  %22 = add i64 %21, 1
  store i64 %22, ptr %6, align 8, !tbaa !9
  br label %7, !llvm.loop !12

23:                                               ; preds = %11
  %24 = load i64, ptr %5, align 8, !tbaa !9
  %25 = uitofp i64 %24 to double
  %26 = fmul double %25, 1.000000e+00
  %27 = load i64, ptr %4, align 8, !tbaa !9
  %28 = uitofp i64 %27 to double
  %29 = fdiv double %26, %28
  %30 = fptrunc double %29 to float
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret float %30
}

; 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 = !{!"long", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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: read) uwtable
define dso_local float @array_mean_u8_naive(ptr nocapture noundef readonly %0, i64 noundef %1) local_unnamed_addr #0 {
  %.not = icmp eq i64 %1, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %2
  %xtraiter = and i64 %1, 7
  %3 = icmp ult i64 %1, 8
  br i1 %3, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %1, -8
  br label %.lr.ph

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %.lcssa.ph = phi i64 [ poison, %.lr.ph.preheader ], [ %51, %.lr.ph ]
  %.010.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %52, %.lr.ph ]
  %.079.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %51, %.lr.ph ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge.loopexit, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil
  %.010.epil = phi i64 [ %8, %.lr.ph.epil ], [ %.010.unr, %._crit_edge.loopexit.unr-lcssa ]
  %.079.epil = phi i64 [ %7, %.lr.ph.epil ], [ %.079.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i64 [ %epil.iter.next, %.lr.ph.epil ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %4 = getelementptr inbounds i8, ptr %0, i64 %.010.epil
  %5 = load i8, ptr %4, align 1, !tbaa !5
  %6 = zext i8 %5 to i64
  %7 = add i64 %.079.epil, %6
  %8 = add nuw i64 %.010.epil, 1
  %epil.iter.next = add i64 %epil.iter, 1
  %epil.iter.cmp.not = icmp eq i64 %epil.iter.next, %xtraiter
  br i1 %epil.iter.cmp.not, label %._crit_edge.loopexit, label %.lr.ph.epil, !llvm.loop !8

._crit_edge.loopexit:                             ; preds = %.lr.ph.epil, %._crit_edge.loopexit.unr-lcssa
  %.lcssa = phi i64 [ %.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %7, %.lr.ph.epil ]
  %9 = uitofp i64 %.lcssa to double
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %2
  %.07.lcssa = phi double [ 0.000000e+00, %2 ], [ %9, %._crit_edge.loopexit ]
  %10 = uitofp i64 %1 to double
  %11 = fdiv double %.07.lcssa, %10
  %12 = fptrunc double %11 to float
  ret float %12

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %.010 = phi i64 [ 0, %.lr.ph.preheader.new ], [ %52, %.lr.ph ]
  %.079 = phi i64 [ 0, %.lr.ph.preheader.new ], [ %51, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.7, %.lr.ph ]
  %13 = getelementptr inbounds i8, ptr %0, i64 %.010
  %14 = load i8, ptr %13, align 1, !tbaa !5
  %15 = zext i8 %14 to i64
  %16 = add i64 %.079, %15
  %17 = or disjoint i64 %.010, 1
  %18 = getelementptr inbounds i8, ptr %0, i64 %17
  %19 = load i8, ptr %18, align 1, !tbaa !5
  %20 = zext i8 %19 to i64
  %21 = add i64 %16, %20
  %22 = or disjoint i64 %.010, 2
  %23 = getelementptr inbounds i8, ptr %0, i64 %22
  %24 = load i8, ptr %23, align 1, !tbaa !5
  %25 = zext i8 %24 to i64
  %26 = add i64 %21, %25
  %27 = or disjoint i64 %.010, 3
  %28 = getelementptr inbounds i8, ptr %0, i64 %27
  %29 = load i8, ptr %28, align 1, !tbaa !5
  %30 = zext i8 %29 to i64
  %31 = add i64 %26, %30
  %32 = or disjoint i64 %.010, 4
  %33 = getelementptr inbounds i8, ptr %0, i64 %32
  %34 = load i8, ptr %33, align 1, !tbaa !5
  %35 = zext i8 %34 to i64
  %36 = add i64 %31, %35
  %37 = or disjoint i64 %.010, 5
  %38 = getelementptr inbounds i8, ptr %0, i64 %37
  %39 = load i8, ptr %38, align 1, !tbaa !5
  %40 = zext i8 %39 to i64
  %41 = add i64 %36, %40
  %42 = or disjoint i64 %.010, 6
  %43 = getelementptr inbounds i8, ptr %0, i64 %42
  %44 = load i8, ptr %43, align 1, !tbaa !5
  %45 = zext i8 %44 to i64
  %46 = add i64 %41, %45
  %47 = or disjoint i64 %.010, 7
  %48 = getelementptr inbounds i8, ptr %0, i64 %47
  %49 = load i8, ptr %48, align 1, !tbaa !5
  %50 = zext i8 %49 to i64
  %51 = add i64 %46, %50
  %52 = add nuw i64 %.010, 8
  %niter.next.7 = add i64 %niter, 8
  %niter.ncmp.7 = icmp eq i64 %niter.next.7, %unroll_iter
  br i1 %niter.ncmp.7, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !10
}

attributes #0 = { nofree norecurse nosync nounwind memory(argmem: read) 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.unroll.disable"}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}


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