; 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 allocsize(0)
declare noalias ptr @malloc(i64 noundef) #1

; Function Attrs: nounwind uwtable
define dso_local ptr @r8vec_running_sum(i32 noundef %0, ptr noundef %1) #2 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, 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) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = add nsw i32 %7, 1
  %9 = sext i32 %8 to i64
  %10 = mul i64 %9, 8
  %11 = call noalias ptr @malloc(i64 noundef %10) #4
  store ptr %11, ptr %6, align 8, !tbaa !9
  %12 = load ptr, ptr %6, align 8, !tbaa !9
  %13 = getelementptr inbounds double, ptr %12, i64 0
  store double 0.000000e+00, ptr %13, align 8, !tbaa !11
  store i32 1, ptr %5, align 4, !tbaa !5
  br label %14

14:                                               ; preds = %37, %2
  %15 = load i32, ptr %5, align 4, !tbaa !5
  %16 = load i32, ptr %3, align 4, !tbaa !5
  %17 = add nsw i32 %16, 1
  %18 = icmp slt i32 %15, %17
  br i1 %18, label %19, label %40

19:                                               ; preds = %14
  %20 = load ptr, ptr %6, align 8, !tbaa !9
  %21 = load i32, ptr %5, align 4, !tbaa !5
  %22 = sub nsw i32 %21, 1
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds double, ptr %20, i64 %23
  %25 = load double, ptr %24, align 8, !tbaa !11
  %26 = load ptr, ptr %4, align 8, !tbaa !9
  %27 = load i32, ptr %5, align 4, !tbaa !5
  %28 = sub nsw i32 %27, 1
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds double, ptr %26, i64 %29
  %31 = load double, ptr %30, align 8, !tbaa !11
  %32 = fadd double %25, %31
  %33 = load ptr, ptr %6, align 8, !tbaa !9
  %34 = load i32, ptr %5, align 4, !tbaa !5
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds double, ptr %33, i64 %35
  store double %32, ptr %36, align 8, !tbaa !11
  br label %37

37:                                               ; preds = %19
  %38 = load i32, ptr %5, align 4, !tbaa !5
  %39 = add nsw i32 %38, 1
  store i32 %39, ptr %5, align 4, !tbaa !5
  br label %14, !llvm.loop !13

40:                                               ; preds = %14
  %41 = load ptr, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret ptr %41
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind allocsize(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 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 #3 = { nounwind }
attributes #4 = { nounwind allocsize(0) }

!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: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #0

; Function Attrs: nofree nounwind memory(write, argmem: read, inaccessiblemem: readwrite) uwtable
define dso_local noalias noundef ptr @r8vec_running_sum(i32 noundef %0, ptr nocapture noundef readonly %1) local_unnamed_addr #1 {
  %3 = add i32 %0, 1
  %4 = sext i32 %3 to i64
  %5 = shl nsw i64 %4, 3
  %6 = tail call noalias ptr @malloc(i64 noundef %5) #2
  store double 0.000000e+00, ptr %6, align 8, !tbaa !5
  %.not11 = icmp slt i32 %0, 1
  br i1 %.not11, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = zext i32 %3 to i64
  %invariant.gep = getelementptr i8, ptr %1, i64 -8
  %7 = add nsw i64 %wide.trip.count, -1
  %8 = add nsw i64 %wide.trip.count, -2
  %xtraiter = and i64 %7, 3
  %9 = icmp ult i64 %8, 3
  br i1 %9, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %7, -4
  %invariant.gep14 = getelementptr inbounds i8, ptr %6, i64 8
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %10 = phi double [ 0.000000e+00, %.lr.ph.preheader.new ], [ %20, %.lr.ph ]
  %indvars.iv = phi i64 [ 1, %.lr.ph.preheader.new ], [ %indvars.iv.next.3, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.3, %.lr.ph ]
  %gep = getelementptr double, ptr %invariant.gep, i64 %indvars.iv
  %11 = load double, ptr %gep, align 8, !tbaa !5
  %12 = fadd double %10, %11
  %13 = getelementptr inbounds double, ptr %6, i64 %indvars.iv
  store double %12, ptr %13, align 8, !tbaa !5
  %gep.1 = getelementptr double, ptr %1, i64 %indvars.iv
  %14 = load double, ptr %gep.1, align 8, !tbaa !5
  %15 = fadd double %12, %14
  %gep15 = getelementptr inbounds double, ptr %invariant.gep14, i64 %indvars.iv
  store double %15, ptr %gep15, align 8, !tbaa !5
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %gep.2 = getelementptr double, ptr %invariant.gep, i64 %indvars.iv.next.1
  %16 = load double, ptr %gep.2, align 8, !tbaa !5
  %17 = fadd double %15, %16
  %18 = getelementptr inbounds double, ptr %6, i64 %indvars.iv.next.1
  store double %17, ptr %18, align 8, !tbaa !5
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %gep.3 = getelementptr double, ptr %invariant.gep, i64 %indvars.iv.next.2
  %19 = load double, ptr %gep.3, align 8, !tbaa !5
  %20 = fadd double %17, %19
  %21 = getelementptr inbounds double, ptr %6, i64 %indvars.iv.next.2
  store double %20, ptr %21, align 8, !tbaa !5
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %niter.next.3 = add i64 %niter, 4
  %niter.ncmp.3 = icmp eq i64 %niter.next.3, %unroll_iter
  br i1 %niter.ncmp.3, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !9

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %.unr = phi double [ 0.000000e+00, %.lr.ph.preheader ], [ %20, %.lr.ph ]
  %indvars.iv.unr = phi i64 [ 1, %.lr.ph.preheader ], [ %indvars.iv.next.3, %.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
  %22 = phi double [ %24, %.lr.ph.epil ], [ %.unr, %._crit_edge.loopexit.unr-lcssa ]
  %indvars.iv.epil = phi i64 [ %indvars.iv.next.epil, %.lr.ph.epil ], [ %indvars.iv.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i64 [ %epil.iter.next, %.lr.ph.epil ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %gep.epil = getelementptr double, ptr %invariant.gep, i64 %indvars.iv.epil
  %23 = load double, ptr %gep.epil, align 8, !tbaa !5
  %24 = fadd double %22, %23
  %25 = getelementptr inbounds double, ptr %6, i64 %indvars.iv.epil
  store double %24, ptr %25, align 8, !tbaa !5
  %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
  ret ptr %6
}

attributes #0 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { nofree nounwind memory(write, argmem: read, inaccessiblemem: readwrite) 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 allocsize(0) }

!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: BDCEPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass