; LLVM IR from upupming/algorithm :: kick-start/2022/RoundB/b.ll (Z5solvev)

; 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"

@a = external dso_local global i64, align 8
@b = external dso_local global [3000000 x i64], align 16
@n = external dso_local global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z5solvev() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #2
  store i32 0, ptr %1, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #2
  store i32 0, ptr %2, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %29, %0
  %5 = load i32, ptr %2, align 4, !tbaa !5
  %6 = load i32, ptr @n, align 4, !tbaa !5
  %7 = icmp slt i32 %5, %6
  br i1 %7, label %9, label %8

8:                                                ; preds = %4
  store i32 2, ptr %3, align 4
  br label %32

9:                                                ; preds = %4
  %10 = load i64, ptr @a, align 8, !tbaa !9
  %11 = load i32, ptr %2, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds [3000000 x i64], ptr @b, i64 0, i64 %12
  %14 = load i64, ptr %13, align 8, !tbaa !9
  %15 = srem i64 %10, %14
  %16 = icmp eq i64 %15, 0
  br i1 %16, label %17, label %20

17:                                               ; preds = %9
  %18 = load i32, ptr %1, align 4, !tbaa !5
  %19 = add nsw i32 %18, 1
  store i32 %19, ptr %1, align 4, !tbaa !5
  br label %20

20:                                               ; preds = %17, %9
  %21 = load i32, ptr %2, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [3000000 x i64], ptr @b, i64 0, i64 %22
  %24 = load i64, ptr %23, align 8, !tbaa !9
  %25 = load i64, ptr @a, align 8, !tbaa !9
  %26 = icmp sge i64 %24, %25
  br i1 %26, label %27, label %28

27:                                               ; preds = %20
  store i32 2, ptr %3, align 4
  br label %32

28:                                               ; preds = %20
  br label %29

29:                                               ; preds = %28
  %30 = load i32, ptr %2, align 4, !tbaa !5
  %31 = add nsw i32 %30, 1
  store i32 %31, ptr %2, align 4, !tbaa !5
  br label %4, !llvm.loop !11

32:                                               ; preds = %27, %8
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #2
  br label %33

33:                                               ; preds = %32
  %34 = load i32, ptr %1, align 4, !tbaa !5
  store i32 1, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #2
  ret i32 %34
}

; 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"

@a = external dso_local local_unnamed_addr global i64, align 8
@b = external dso_local local_unnamed_addr global [3000000 x i64], align 16
@n = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef i32 @_Z5solvev() local_unnamed_addr #0 {
  %1 = load i32, ptr @n, align 4, !tbaa !5
  %2 = icmp sgt i32 %1, 0
  br i1 %2, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %0
  %3 = load i64, ptr @a, align 8, !tbaa !9
  %wide.trip.count = zext nneg i32 %1 to i64
  br label %4

4:                                                ; preds = %4, %.lr.ph
  %indvars.iv = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next, %4 ]
  %.067 = phi i32 [ 0, %.lr.ph ], [ %spec.select, %4 ]
  %5 = getelementptr inbounds [3000000 x i64], ptr @b, i64 0, i64 %indvars.iv
  %6 = load i64, ptr %5, align 8, !tbaa !9
  %7 = srem i64 %3, %6
  %8 = icmp eq i64 %7, 0
  %9 = zext i1 %8 to i32
  %spec.select = add nuw nsw i32 %.067, %9
  %.not = icmp sge i64 %6, %3
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  %or.cond = select i1 %.not, i1 true, i1 %exitcond.not
  br i1 %or.cond, label %._crit_edge, label %4, !llvm.loop !11

._crit_edge:                                      ; preds = %4, %0
  %.2 = phi i32 [ 0, %0 ], [ %spec.select, %4 ]
  ret i32 %.2
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: 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" }

!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"}


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