; LLVM IR from zchrissirhcz/pixel :: src (px_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 @px_array_mean_u8(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i64, align 8
  %6 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store i64 0, ptr %5, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %7

7:                                                ; preds = %21, %2
  %8 = load i32, ptr %6, align 4, !tbaa !9
  %9 = load i32, ptr %4, align 4, !tbaa !9
  %10 = icmp slt i32 %8, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %24

12:                                               ; preds = %7
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = load i32, ptr %6, align 4, !tbaa !9
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds i8, ptr %13, i64 %15
  %17 = load i8, ptr %16, align 1, !tbaa !13
  %18 = zext i8 %17 to i64
  %19 = load i64, ptr %5, align 8, !tbaa !11
  %20 = add i64 %19, %18
  store i64 %20, ptr %5, align 8, !tbaa !11
  br label %21

21:                                               ; preds = %12
  %22 = load i32, ptr %6, align 4, !tbaa !9
  %23 = add nsw i32 %22, 1
  store i32 %23, ptr %6, align 4, !tbaa !9
  br label %7, !llvm.loop !14

24:                                               ; preds = %11
  %25 = load i64, ptr %5, align 8, !tbaa !11
  %26 = uitofp i64 %25 to float
  %27 = fmul float %26, 1.000000e+00
  %28 = load i32, ptr %4, align 4, !tbaa !9
  %29 = sitofp i32 %28 to float
  %30 = fdiv float %27, %29
  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 = !{!"int", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long", !7, i64 0}
!13 = !{!7, !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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 @px_array_mean_u8(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp sgt i32 %1, 0
  br i1 %3, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = zext nneg i32 %1 to i64
  %xtraiter = and i64 %wide.trip.count, 7
  %4 = icmp ult i32 %1, 8
  br i1 %4, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %wide.trip.count, 2147483640
  br label %.lr.ph

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %.lcssa.ph = phi i64 [ poison, %.lr.ph.preheader ], [ %43, %.lr.ph ]
  %indvars.iv.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next.7, %.lr.ph ]
  %.079.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %43, %.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
  %indvars.iv.epil = phi i64 [ %indvars.iv.next.epil, %.lr.ph.epil ], [ %indvars.iv.unr, %._crit_edge.loopexit.unr-lcssa ]
  %.079.epil = phi i64 [ %8, %.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 ]
  %5 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.epil
  %6 = load i8, ptr %5, align 1, !tbaa !5
  %7 = zext i8 %6 to i64
  %8 = add i64 %.079.epil, %7
  %indvars.iv.next.epil = add nuw nsw i64 %indvars.iv.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 ], [ %8, %.lr.ph.epil ]
  %9 = uitofp i64 %.lcssa to float
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %2
  %.07.lcssa = phi float [ 0.000000e+00, %2 ], [ %9, %._crit_edge.loopexit ]
  %10 = sitofp i32 %1 to float
  %11 = fdiv float %.07.lcssa, %10
  ret float %11

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader.new ], [ %indvars.iv.next.7, %.lr.ph ]
  %.079 = phi i64 [ 0, %.lr.ph.preheader.new ], [ %43, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.7, %.lr.ph ]
  %12 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  %13 = load i8, ptr %12, align 1, !tbaa !5
  %14 = zext i8 %13 to i64
  %15 = add i64 %.079, %14
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %16 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next
  %17 = load i8, ptr %16, align 1, !tbaa !5
  %18 = zext i8 %17 to i64
  %19 = add i64 %15, %18
  %indvars.iv.next.1 = or disjoint i64 %indvars.iv, 2
  %20 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next.1
  %21 = load i8, ptr %20, align 1, !tbaa !5
  %22 = zext i8 %21 to i64
  %23 = add i64 %19, %22
  %indvars.iv.next.2 = or disjoint i64 %indvars.iv, 3
  %24 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next.2
  %25 = load i8, ptr %24, align 1, !tbaa !5
  %26 = zext i8 %25 to i64
  %27 = add i64 %23, %26
  %indvars.iv.next.3 = or disjoint i64 %indvars.iv, 4
  %28 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next.3
  %29 = load i8, ptr %28, align 1, !tbaa !5
  %30 = zext i8 %29 to i64
  %31 = add i64 %27, %30
  %indvars.iv.next.4 = or disjoint i64 %indvars.iv, 5
  %32 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next.4
  %33 = load i8, ptr %32, align 1, !tbaa !5
  %34 = zext i8 %33 to i64
  %35 = add i64 %31, %34
  %indvars.iv.next.5 = or disjoint i64 %indvars.iv, 6
  %36 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next.5
  %37 = load i8, ptr %36, align 1, !tbaa !5
  %38 = zext i8 %37 to i64
  %39 = add i64 %35, %38
  %indvars.iv.next.6 = or disjoint i64 %indvars.iv, 7
  %40 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next.6
  %41 = load i8, ptr %40, align 1, !tbaa !5
  %42 = zext i8 %41 to i64
  %43 = add i64 %39, %42
  %indvars.iv.next.7 = add nuw nsw i64 %indvars.iv, 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: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass