; LLVM IR from CLASS-SZ/class_sz :: class-sz/tools (r8lib)

; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local double @r8vec_mean(i32 noundef %0, ptr noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca double, align 8
  store i32 %0, ptr %3, align 4, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  store double 0.000000e+00, ptr %6, align 8, !tbaa !11
  store i32 0, ptr %5, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %19, %2
  %8 = load i32, ptr %5, align 4, !tbaa !5
  %9 = load i32, ptr %3, align 4, !tbaa !5
  %10 = icmp slt i32 %8, %9
  br i1 %10, label %11, label %22

11:                                               ; preds = %7
  %12 = load double, ptr %6, align 8, !tbaa !11
  %13 = load ptr, ptr %4, align 8, !tbaa !9
  %14 = load i32, ptr %5, align 4, !tbaa !5
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds double, ptr %13, i64 %15
  %17 = load double, ptr %16, align 8, !tbaa !11
  %18 = fadd double %12, %17
  store double %18, ptr %6, align 8, !tbaa !11
  br label %19

19:                                               ; preds = %11
  %20 = load i32, ptr %5, align 4, !tbaa !5
  %21 = add nsw i32 %20, 1
  store i32 %21, ptr %5, align 4, !tbaa !5
  br label %7, !llvm.loop !13

22:                                               ; preds = %7
  %23 = load double, ptr %6, align 8, !tbaa !11
  %24 = load i32, ptr %3, align 4, !tbaa !5
  %25 = sitofp i32 %24 to double
  %26 = fdiv double %23, %25
  store double %26, ptr %6, align 8, !tbaa !11
  %27 = load double, ptr %6, align 8, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret double %27
}

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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"double", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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 double @r8vec_mean(i32 noundef %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  %3 = icmp sgt i32 %0, 0
  br i1 %3, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = zext nneg i32 %0 to i64
  %xtraiter = and i64 %wide.trip.count, 7
  %4 = icmp ult i32 %0, 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

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader.new ], [ %indvars.iv.next.7, %.lr.ph ]
  %.011 = phi double [ 0.000000e+00, %.lr.ph.preheader.new ], [ %28, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.7, %.lr.ph ]
  %5 = getelementptr inbounds double, ptr %1, i64 %indvars.iv
  %6 = load double, ptr %5, align 8, !tbaa !5
  %7 = fadd double %.011, %6
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %8 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.next
  %9 = load double, ptr %8, align 8, !tbaa !5
  %10 = fadd double %7, %9
  %indvars.iv.next.1 = or disjoint i64 %indvars.iv, 2
  %11 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.next.1
  %12 = load double, ptr %11, align 8, !tbaa !5
  %13 = fadd double %10, %12
  %indvars.iv.next.2 = or disjoint i64 %indvars.iv, 3
  %14 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.next.2
  %15 = load double, ptr %14, align 8, !tbaa !5
  %16 = fadd double %13, %15
  %indvars.iv.next.3 = or disjoint i64 %indvars.iv, 4
  %17 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.next.3
  %18 = load double, ptr %17, align 8, !tbaa !5
  %19 = fadd double %16, %18
  %indvars.iv.next.4 = or disjoint i64 %indvars.iv, 5
  %20 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.next.4
  %21 = load double, ptr %20, align 8, !tbaa !5
  %22 = fadd double %19, %21
  %indvars.iv.next.5 = or disjoint i64 %indvars.iv, 6
  %23 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.next.5
  %24 = load double, ptr %23, align 8, !tbaa !5
  %25 = fadd double %22, %24
  %indvars.iv.next.6 = or disjoint i64 %indvars.iv, 7
  %26 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.next.6
  %27 = load double, ptr %26, align 8, !tbaa !5
  %28 = fadd double %25, %27
  %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 double [ poison, %.lr.ph.preheader ], [ %28, %.lr.ph ]
  %indvars.iv.unr = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next.7, %.lr.ph ]
  %.011.unr = phi double [ 0.000000e+00, %.lr.ph.preheader ], [ %28, %.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 ]
  %.011.epil = phi double [ %31, %.lr.ph.epil ], [ %.011.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i64 [ %epil.iter.next, %.lr.ph.epil ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %29 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.epil
  %30 = load double, ptr %29, align 8, !tbaa !5
  %31 = fadd double %.011.epil, %30
  %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
  %.0.lcssa = phi double [ 0.000000e+00, %2 ], [ %.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %31, %.lr.ph.epil ]
  %32 = sitofp i32 %0 to double
  %33 = fdiv double %.0.lcssa, %32
  ret double %33
}

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 = !{!"double", !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: GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass