; LLVM IR from codemistic/Data-Structures-and-Algorithms :: CPP/array-2d/brute_force.ll (Z19largestsubarray_sumPii)

; 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 uwtable
define dso_local noundef i32 @_Z19largestsubarray_sumPii(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = 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 4, ptr %5) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %48, %2
  %12 = load i32, ptr %6, align 4, !tbaa !9
  %13 = load i32, ptr %4, align 4, !tbaa !9
  %14 = icmp slt i32 %12, %13
  br i1 %14, label %16, label %15

15:                                               ; preds = %11
  store i32 2, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  br label %51

16:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  %17 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %17, ptr %8, align 4, !tbaa !9
  br label %18

18:                                               ; preds = %44, %16
  %19 = load i32, ptr %8, align 4, !tbaa !9
  %20 = load i32, ptr %4, align 4, !tbaa !9
  %21 = icmp slt i32 %19, %20
  br i1 %21, label %23, label %22

22:                                               ; preds = %18
  store i32 5, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  br label %47

23:                                               ; preds = %18
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  store i32 0, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  %24 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %24, ptr %10, align 4, !tbaa !9
  br label %25

25:                                               ; preds = %38, %23
  %26 = load i32, ptr %10, align 4, !tbaa !9
  %27 = load i32, ptr %8, align 4, !tbaa !9
  %28 = icmp sle i32 %26, %27
  br i1 %28, label %30, label %29

29:                                               ; preds = %25
  store i32 8, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  br label %41

30:                                               ; preds = %25
  %31 = load ptr, ptr %3, align 8, !tbaa !5
  %32 = load i32, ptr %10, align 4, !tbaa !9
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds i32, ptr %31, i64 %33
  %35 = load i32, ptr %34, align 4, !tbaa !9
  %36 = load i32, ptr %9, align 4, !tbaa !9
  %37 = add nsw i32 %36, %35
  store i32 %37, ptr %9, align 4, !tbaa !9
  br label %38

38:                                               ; preds = %30
  %39 = load i32, ptr %10, align 4, !tbaa !9
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %10, align 4, !tbaa !9
  br label %25, !llvm.loop !11

41:                                               ; preds = %29
  %42 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %5, ptr noundef nonnull align 4 dereferenceable(4) %9)
  %43 = load i32, ptr %42, align 4, !tbaa !9
  store i32 %43, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  br label %44

44:                                               ; preds = %41
  %45 = load i32, ptr %8, align 4, !tbaa !9
  %46 = add nsw i32 %45, 1
  store i32 %46, ptr %8, align 4, !tbaa !9
  br label %18, !llvm.loop !13

47:                                               ; preds = %22
  br label %48

48:                                               ; preds = %47
  %49 = load i32, ptr %6, align 4, !tbaa !9
  %50 = add nsw i32 %49, 1
  store i32 %50, ptr %6, align 4, !tbaa !9
  br label %11, !llvm.loop !14

51:                                               ; preds = %15
  %52 = load i32, ptr %5, align 4, !tbaa !9
  store i32 1, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret i32 %52
}

; 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

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #2

attributes #0 = { mustprogress 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 = { inlinehint 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 #3 = { 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}
!14 = distinct !{!14, !12}


; 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 nounwind uwtable
define dso_local noundef i32 @_Z19largestsubarray_sumPii(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
.preheader.preheader:
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #5
  %4 = icmp sgt i32 %1, 0
  tail call void @llvm.assume(i1 %4)
  %5 = add nuw i32 %1, 1
  %wide.trip.count = zext nneg i32 %1 to i64
  %wide.trip.count32 = zext i32 %5 to i64
  br label %.preheader

.preheader:                                       ; preds = %.preheader.preheader, %7
  %indvars.iv27 = phi i64 [ 1, %.preheader.preheader ], [ %indvars.iv.next28, %7 ]
  %indvars.iv = phi i64 [ 0, %.preheader.preheader ], [ %indvars.iv.next, %7 ]
  %indvars36 = trunc i64 %indvars.iv to i32
  %6 = getelementptr i32, ptr %0, i64 %indvars.iv
  br label %8

._crit_edge19:                                    ; preds = %7
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #5
  ret i32 %18

7:                                                ; preds = %16
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %indvars.iv.next28 = add nuw nsw i64 %indvars.iv27, 1
  %exitcond37.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond37.not, label %._crit_edge19, label %.preheader, !llvm.loop !5

8:                                                ; preds = %.preheader, %16
  %indvar = phi i64 [ 0, %.preheader ], [ %indvar.next, %16 ]
  %indvars.iv29 = phi i64 [ %indvars.iv27, %.preheader ], [ %indvars.iv.next30, %16 ]
  %.01217 = phi i32 [ %indvars36, %.preheader ], [ %19, %16 ]
  %9 = add i64 %indvar, 1
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #5
  store i32 0, ptr %3, align 4, !tbaa !7
  %.not15 = icmp ult i32 %.01217, %indvars36
  br i1 %.not15, label %16, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %8
  %min.iters.check = icmp ult i64 %9, 8
  br i1 %min.iters.check, label %.lr.ph.preheader42, label %vector.ph

.lr.ph.preheader42:                               ; preds = %middle.block, %.lr.ph.preheader
  %indvars.iv20.ph = phi i64 [ %indvars.iv, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  %.ph = phi i32 [ 0, %.lr.ph.preheader ], [ %15, %middle.block ]
  br label %.lr.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %9, -8
  %ind.end = add i64 %indvars.iv, %n.vec
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.phi = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %12, %vector.body ]
  %vec.phi40 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %13, %vector.body ]
  %10 = getelementptr i32, ptr %6, i64 %index
  %11 = getelementptr inbounds i8, ptr %10, i64 16
  %wide.load = load <4 x i32>, ptr %10, align 4, !tbaa !7
  %wide.load41 = load <4 x i32>, ptr %11, align 4, !tbaa !7
  %12 = add <4 x i32> %vec.phi, %wide.load
  %13 = add <4 x i32> %vec.phi40, %wide.load41
  %index.next = add nuw i64 %index, 8
  %14 = icmp eq i64 %index.next, %n.vec
  br i1 %14, label %middle.block, label %vector.body, !llvm.loop !11

middle.block:                                     ; preds = %vector.body
  %bin.rdx = add <4 x i32> %13, %12
  %15 = call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> %bin.rdx)
  %cmp.n = icmp eq i64 %9, %n.vec
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader42

._crit_edge:                                      ; preds = %.lr.ph, %middle.block
  %.lcssa = phi i32 [ %15, %middle.block ], [ %23, %.lr.ph ]
  store i32 %.lcssa, ptr %3, align 4, !tbaa !7
  br label %16

16:                                               ; preds = %._crit_edge, %8
  %17 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %2, ptr noundef nonnull align 4 dereferenceable(4) %3)
  %18 = load i32, ptr %17, align 4, !tbaa !7
  store i32 %18, ptr %2, align 4, !tbaa !7
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #5
  %19 = add nuw nsw i32 %.01217, 1
  %indvars.iv.next30 = add nuw nsw i64 %indvars.iv29, 1
  %exitcond33.not = icmp eq i64 %indvars.iv.next30, %wide.trip.count32
  %indvar.next = add i64 %indvar, 1
  br i1 %exitcond33.not, label %7, label %8, !llvm.loop !14

.lr.ph:                                           ; preds = %.lr.ph.preheader42, %.lr.ph
  %indvars.iv20 = phi i64 [ %indvars.iv.next21, %.lr.ph ], [ %indvars.iv20.ph, %.lr.ph.preheader42 ]
  %20 = phi i32 [ %23, %.lr.ph ], [ %.ph, %.lr.ph.preheader42 ]
  %21 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv20
  %22 = load i32, ptr %21, align 4, !tbaa !7
  %23 = add nsw i32 %20, %22
  %indvars.iv.next21 = add nuw nsw i64 %indvars.iv20, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next21, %indvars.iv29
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !15
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write)
declare void @llvm.assume(i1 noundef) #3

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.vector.reduce.add.v4i32(<4 x i32>) #4

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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { inlinehint 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 #3 = { nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write) }
attributes #4 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #5 = { 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = !{!8, !8, i64 0}
!8 = !{!"int", !9, i64 0}
!9 = !{!"omnipotent char", !10, i64 0}
!10 = !{!"Simple C++ TBAA"}
!11 = distinct !{!11, !6, !12, !13}
!12 = !{!"llvm.loop.isvectorized", i32 1}
!13 = !{!"llvm.loop.unroll.runtime.disable"}
!14 = distinct !{!14, !6}
!15 = distinct !{!15, !6, !13, !12}


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