; LLVM IR from kazunetakahashi/atcoder :: 2017/0408_ARC071/D.ll (Z6lengthPxi)

; 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 @_Z6lengthPxi(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  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 8, ptr %5) #2
  store i64 0, ptr %5, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  store i64 0, ptr %6, align 8, !tbaa !11
  br label %8

8:                                                ; preds = %42, %2
  %9 = load i64, ptr %6, align 8, !tbaa !11
  %10 = load i32, ptr %4, align 4, !tbaa !9
  %11 = sub nsw i32 %10, 1
  %12 = sext i32 %11 to i64
  %13 = icmp slt i64 %9, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %45

15:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %16 = load i64, ptr %6, align 8, !tbaa !11
  %17 = add nsw i64 %16, 1
  %18 = load i32, ptr %4, align 4, !tbaa !9
  %19 = sub nsw i32 %18, 1
  %20 = sext i32 %19 to i64
  %21 = load i64, ptr %6, align 8, !tbaa !11
  %22 = sub nsw i64 %20, %21
  %23 = mul nsw i64 %17, %22
  %24 = srem i64 %23, 1000000007
  store i64 %24, ptr %7, align 8, !tbaa !11
  %25 = load i64, ptr %7, align 8, !tbaa !11
  %26 = load ptr, ptr %3, align 8, !tbaa !5
  %27 = load i64, ptr %6, align 8, !tbaa !11
  %28 = add nsw i64 %27, 1
  %29 = getelementptr inbounds i64, ptr %26, i64 %28
  %30 = load i64, ptr %29, align 8, !tbaa !11
  %31 = load ptr, ptr %3, align 8, !tbaa !5
  %32 = load i64, ptr %6, align 8, !tbaa !11
  %33 = getelementptr inbounds i64, ptr %31, i64 %32
  %34 = load i64, ptr %33, align 8, !tbaa !11
  %35 = sub nsw i64 %30, %34
  %36 = mul nsw i64 %25, %35
  %37 = srem i64 %36, 1000000007
  %38 = load i64, ptr %5, align 8, !tbaa !11
  %39 = add nsw i64 %38, %37
  store i64 %39, ptr %5, align 8, !tbaa !11
  %40 = load i64, ptr %5, align 8, !tbaa !11
  %41 = srem i64 %40, 1000000007
  store i64 %41, ptr %5, align 8, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  br label %42

42:                                               ; preds = %15
  %43 = load i64, ptr %6, align 8, !tbaa !11
  %44 = add nsw i64 %43, 1
  store i64 %44, ptr %6, align 8, !tbaa !11
  br label %8, !llvm.loop !13

45:                                               ; preds = %14
  %46 = load i64, ptr %5, align 8, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret i64 %46
}

; 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 = !{!"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 = !{!12, !12, i64 0}
!12 = !{!"long long", !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 norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef range(i64 -1000000006, 1000000007) i64 @_Z6lengthPxi(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = add i32 %1, -1
  %4 = sext i32 %3 to i64
  %5 = icmp sgt i32 %1, 1
  br i1 %5, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %.pre = load i64, ptr %0, align 8, !tbaa !5
  br label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %2
  %.0.lcssa = phi i64 [ 0, %2 ], [ %17, %.lr.ph ]
  ret i64 %.0.lcssa

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %6 = phi i64 [ %12, %.lr.ph ], [ %.pre, %.lr.ph.preheader ]
  %.016 = phi i64 [ %17, %.lr.ph ], [ 0, %.lr.ph.preheader ]
  %.01315 = phi i64 [ %7, %.lr.ph ], [ 0, %.lr.ph.preheader ]
  %7 = add nuw nsw i64 %.01315, 1
  %8 = sub nsw i64 %4, %.01315
  %9 = mul nsw i64 %7, %8
  %10 = srem i64 %9, 1000000007
  %11 = getelementptr inbounds i64, ptr %0, i64 %7
  %12 = load i64, ptr %11, align 8, !tbaa !5
  %13 = sub nsw i64 %12, %6
  %14 = mul nsw i64 %13, %10
  %15 = srem i64 %14, 1000000007
  %16 = add nsw i64 %15, %.016
  %17 = srem i64 %16, 1000000007
  %exitcond.not = icmp eq i64 %7, %4
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn 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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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