; LLVM IR from cvra/robot-software :: lib/filter (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 @mean(ptr noundef %0, i64 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca float, align 4
  %6 = alloca i32, align 4
  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 4, ptr %5) #2
  store float 0.000000e+00, ptr %5, align 4, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !13
  br label %7

7:                                                ; preds = %20, %2
  %8 = load i32, ptr %6, align 4, !tbaa !13
  %9 = sext i32 %8 to i64
  %10 = load i64, ptr %4, align 8, !tbaa !9
  %11 = icmp ult i64 %9, %10
  br i1 %11, label %12, label %23

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

20:                                               ; preds = %12
  %21 = load i32, ptr %6, align 4, !tbaa !13
  %22 = add nsw i32 %21, 1
  store i32 %22, ptr %6, align 4, !tbaa !13
  br label %7, !llvm.loop !15

23:                                               ; preds = %7
  %24 = load float, ptr %5, align 4, !tbaa !11
  %25 = load i64, ptr %4, align 8, !tbaa !9
  %26 = uitofp i64 %25 to float
  %27 = fdiv float %24, %26
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret float %27
}

; 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 = !{!12, !12, i64 0}
!12 = !{!"float", !7, i64 0}
!13 = !{!14, !14, i64 0}
!14 = !{!"int", !7, i64 0}
!15 = distinct !{!15, !16}
!16 = !{!"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 @mean(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

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader.new ], [ %indvars.iv.next.7, %.lr.ph ]
  %.0710 = phi float [ 0.000000e+00, %.lr.ph.preheader.new ], [ %27, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.7, %.lr.ph ]
  %4 = getelementptr inbounds float, ptr %0, i64 %indvars.iv
  %5 = load float, ptr %4, align 4, !tbaa !5
  %6 = fadd float %.0710, %5
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %7 = getelementptr inbounds float, ptr %0, i64 %indvars.iv.next
  %8 = load float, ptr %7, align 4, !tbaa !5
  %9 = fadd float %6, %8
  %indvars.iv.next.1 = or disjoint i64 %indvars.iv, 2
  %10 = getelementptr inbounds float, ptr %0, i64 %indvars.iv.next.1
  %11 = load float, ptr %10, align 4, !tbaa !5
  %12 = fadd float %9, %11
  %indvars.iv.next.2 = or disjoint i64 %indvars.iv, 3
  %13 = getelementptr inbounds float, ptr %0, i64 %indvars.iv.next.2
  %14 = load float, ptr %13, align 4, !tbaa !5
  %15 = fadd float %12, %14
  %indvars.iv.next.3 = or disjoint i64 %indvars.iv, 4
  %16 = getelementptr inbounds float, ptr %0, i64 %indvars.iv.next.3
  %17 = load float, ptr %16, align 4, !tbaa !5
  %18 = fadd float %15, %17
  %indvars.iv.next.4 = or disjoint i64 %indvars.iv, 5
  %19 = getelementptr inbounds float, ptr %0, i64 %indvars.iv.next.4
  %20 = load float, ptr %19, align 4, !tbaa !5
  %21 = fadd float %18, %20
  %indvars.iv.next.5 = or disjoint i64 %indvars.iv, 6
  %22 = getelementptr inbounds float, ptr %0, i64 %indvars.iv.next.5
  %23 = load float, ptr %22, align 4, !tbaa !5
  %24 = fadd float %21, %23
  %indvars.iv.next.6 = or disjoint i64 %indvars.iv, 7
  %25 = getelementptr inbounds float, ptr %0, i64 %indvars.iv.next.6
  %26 = load float, ptr %25, align 4, !tbaa !5
  %27 = fadd float %24, %26
  %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 !9

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %.lcssa.ph = phi float [ poison, %.lr.ph.preheader ], [ %27, %.lr.ph ]
  %indvars.iv.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next.7, %.lr.ph ]
  %.0710.unr = phi float [ 0.000000e+00, %.lr.ph.preheader ], [ %27, %.lr.ph ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, 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 ]
  %.0710.epil = phi float [ %30, %.lr.ph.epil ], [ %.0710.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i64 [ %epil.iter.next, %.lr.ph.epil ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %28 = getelementptr inbounds float, ptr %0, i64 %indvars.iv.epil
  %29 = load float, ptr %28, align 4, !tbaa !5
  %30 = fadd float %.0710.epil, %29
  %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, label %.lr.ph.epil, !llvm.loop !11

._crit_edge:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil, %2
  %.07.lcssa = phi float [ 0.000000e+00, %2 ], [ %.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %30, %.lr.ph.epil ]
  %31 = uitofp nneg i64 %1 to float
  %32 = fdiv float %.07.lcssa, %31
  ret float %32
}

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 = !{!"float", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.unroll.disable"}


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