; LLVM IR from evanxg852000/rockstartdev :: modern-cpp/chap1/core.ll (Z19sum_of_nat_div_by35i)

; 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: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z19sum_of_nat_div_by35i(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i64, align 8
  %4 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  store i64 0, ptr %3, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !5
  br label %5

5:                                                ; preds = %20, %1
  %6 = load i32, ptr %4, align 4, !tbaa !5
  %7 = load i32, ptr %2, align 4, !tbaa !5
  %8 = icmp slt i32 %6, %7
  br i1 %8, label %10, label %9

9:                                                ; preds = %5
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %23

10:                                               ; preds = %5
  %11 = load i32, ptr %4, align 4, !tbaa !5
  %12 = srem i32 %11, 15
  %13 = icmp eq i32 %12, 0
  br i1 %13, label %14, label %19

14:                                               ; preds = %10
  %15 = load i32, ptr %4, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = load i64, ptr %3, align 8, !tbaa !9
  %18 = add i64 %17, %16
  store i64 %18, ptr %3, align 8, !tbaa !9
  br label %19

19:                                               ; preds = %14, %10
  br label %20

20:                                               ; preds = %19
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = add nsw i32 %21, 1
  store i32 %22, ptr %4, align 4, !tbaa !5
  br label %5, !llvm.loop !11

23:                                               ; preds = %9
  %24 = load i64, ptr %3, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret i64 %24
}

; 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 = { mustprogress 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long long", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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 norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i64 @_Z19sum_of_nat_div_by35i(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp sgt i32 %0, 0
  br i1 %2, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %1
  %min.iters.check = icmp ult i32 %0, 4
  br i1 %min.iters.check, label %.lr.ph.preheader12, label %vector.ph

.lr.ph.preheader12:                               ; preds = %middle.block, %.lr.ph.preheader
  %.09.ph = phi i32 [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  %.078.ph = phi i64 [ 0, %.lr.ph.preheader ], [ %14, %middle.block ]
  br label %.lr.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i32 %0, 2147483644
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i32 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.ind = phi <2 x i32> [ <i32 0, i32 1>, %vector.ph ], [ %vec.ind.next, %vector.body ]
  %vec.phi = phi <2 x i64> [ zeroinitializer, %vector.ph ], [ %11, %vector.body ]
  %vec.phi11 = phi <2 x i64> [ zeroinitializer, %vector.ph ], [ %12, %vector.body ]
  %step.add = add <2 x i32> %vec.ind, <i32 2, i32 2>
  %3 = urem <2 x i32> %vec.ind, <i32 15, i32 15>
  %4 = urem <2 x i32> %step.add, <i32 15, i32 15>
  %5 = icmp eq <2 x i32> %3, zeroinitializer
  %6 = icmp eq <2 x i32> %4, zeroinitializer
  %7 = select <2 x i1> %5, <2 x i32> %vec.ind, <2 x i32> zeroinitializer
  %8 = select <2 x i1> %6, <2 x i32> %step.add, <2 x i32> zeroinitializer
  %9 = zext <2 x i32> %7 to <2 x i64>
  %10 = zext <2 x i32> %8 to <2 x i64>
  %11 = add <2 x i64> %vec.phi, %9
  %12 = add <2 x i64> %vec.phi11, %10
  %index.next = add nuw i32 %index, 4
  %vec.ind.next = add <2 x i32> %vec.ind, <i32 4, i32 4>
  %13 = icmp eq i32 %index.next, %n.vec
  br i1 %13, label %middle.block, label %vector.body, !llvm.loop !5

middle.block:                                     ; preds = %vector.body
  %bin.rdx = add <2 x i64> %12, %11
  %14 = tail call i64 @llvm.vector.reduce.add.v2i64(<2 x i64> %bin.rdx)
  %cmp.n = icmp eq i32 %n.vec, %0
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader12

._crit_edge:                                      ; preds = %.lr.ph, %middle.block, %1
  %.07.lcssa = phi i64 [ 0, %1 ], [ %14, %middle.block ], [ %.1, %.lr.ph ]
  ret i64 %.07.lcssa

.lr.ph:                                           ; preds = %.lr.ph.preheader12, %.lr.ph
  %.09 = phi i32 [ %18, %.lr.ph ], [ %.09.ph, %.lr.ph.preheader12 ]
  %.078 = phi i64 [ %.1, %.lr.ph ], [ %.078.ph, %.lr.ph.preheader12 ]
  %15 = urem i32 %.09, 15
  %16 = icmp eq i32 %15, 0
  %narrow = select i1 %16, i32 %.09, i32 0
  %17 = zext nneg i32 %narrow to i64
  %.1 = add i64 %.078, %17
  %18 = add nuw nsw i32 %.09, 1
  %exitcond.not = icmp eq i32 %18, %0
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.vector.reduce.add.v2i64(<2 x i64>) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(none) 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 speculatable willreturn memory(none) }

!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 = distinct !{!5, !6, !7, !8}
!6 = !{!"llvm.loop.mustprogress"}
!7 = !{!"llvm.loop.isvectorized", i32 1}
!8 = !{!"llvm.loop.unroll.runtime.disable"}
!9 = distinct !{!9, !6, !8, !7}


; Effective O3 passes: GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass