; LLVM IR from lzyrapx/Competitive-Programming :: HDUOJ/2068.ll (Z1Cii)

; 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 i32 @_Z1Cii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store i64 1, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  store i64 1, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  store i64 1, ptr %7, align 8, !tbaa !9
  br label %8

8:                                                ; preds = %21, %2
  %9 = load i64, ptr %7, align 8, !tbaa !9
  %10 = load i32, ptr %4, align 4, !tbaa !5
  %11 = sext i32 %10 to i64
  %12 = icmp sle i64 %9, %11
  br i1 %12, label %13, label %26

13:                                               ; preds = %8
  %14 = load i64, ptr %7, align 8, !tbaa !9
  %15 = load i64, ptr %6, align 8, !tbaa !9
  %16 = mul nsw i64 %15, %14
  store i64 %16, ptr %6, align 8, !tbaa !9
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = load i64, ptr %5, align 8, !tbaa !9
  %20 = mul nsw i64 %19, %18
  store i64 %20, ptr %5, align 8, !tbaa !9
  br label %21

21:                                               ; preds = %13
  %22 = load i64, ptr %7, align 8, !tbaa !9
  %23 = add nsw i64 %22, 1
  store i64 %23, ptr %7, align 8, !tbaa !9
  %24 = load i32, ptr %3, align 4, !tbaa !5
  %25 = add nsw i32 %24, -1
  store i32 %25, ptr %3, align 4, !tbaa !5
  br label %8, !llvm.loop !11

26:                                               ; preds = %8
  %27 = load i64, ptr %5, align 8, !tbaa !9
  %28 = load i64, ptr %6, align 8, !tbaa !9
  %29 = sdiv i64 %27, %28
  %30 = trunc i64 %29 to i32
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret i32 %30
}

; 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 i32 @_Z1Cii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %.not13 = icmp slt i32 %1, 1
  br i1 %.not13, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %2
  %3 = zext nneg i32 %1 to i64
  %4 = sext i32 %0 to i64
  %xtraiter = and i64 %3, 3
  %5 = icmp ult i32 %1, 4
  br i1 %5, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %3, 2147483644
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ %4, %.lr.ph.preheader.new ], [ %indvars.iv.next.3, %.lr.ph ]
  %.017 = phi i64 [ 1, %.lr.ph.preheader.new ], [ %17, %.lr.ph ]
  %.01016 = phi i64 [ 1, %.lr.ph.preheader.new ], [ %15, %.lr.ph ]
  %.01115 = phi i64 [ 1, %.lr.ph.preheader.new ], [ %16, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.3, %.lr.ph ]
  %6 = mul nuw nsw i64 %.017, %.01016
  %7 = mul nsw i64 %.01115, %indvars.iv
  %8 = add nuw nsw i64 %.017, 1
  %indvars.iv.next = add nsw i64 %indvars.iv, -1
  %9 = mul nuw nsw i64 %8, %6
  %10 = mul nsw i64 %7, %indvars.iv.next
  %11 = add nuw nsw i64 %.017, 2
  %indvars.iv.next.1 = add nsw i64 %indvars.iv, -2
  %12 = mul nuw nsw i64 %11, %9
  %13 = mul nsw i64 %10, %indvars.iv.next.1
  %14 = add nuw nsw i64 %.017, 3
  %indvars.iv.next.2 = add nsw i64 %indvars.iv, -3
  %15 = mul nuw nsw i64 %14, %12
  %16 = mul nsw i64 %13, %indvars.iv.next.2
  %17 = add nuw nsw i64 %.017, 4
  %indvars.iv.next.3 = add 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 !5

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %.lcssa23.ph = phi i64 [ poison, %.lr.ph.preheader ], [ %15, %.lr.ph ]
  %.lcssa.ph = phi i64 [ poison, %.lr.ph.preheader ], [ %16, %.lr.ph ]
  %indvars.iv.unr = phi i64 [ %4, %.lr.ph.preheader ], [ %indvars.iv.next.3, %.lr.ph ]
  %.017.unr = phi i64 [ 1, %.lr.ph.preheader ], [ %17, %.lr.ph ]
  %.01016.unr = phi i64 [ 1, %.lr.ph.preheader ], [ %15, %.lr.ph ]
  %.01115.unr = phi i64 [ 1, %.lr.ph.preheader ], [ %16, %.lr.ph ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge.loopexit, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.loopexit.unr-lcssa, %.lr.ph.epil
  %indvars.iv.epil = phi i64 [ %indvars.iv.next.epil, %.lr.ph.epil ], [ %indvars.iv.unr, %._crit_edge.loopexit.unr-lcssa ]
  %.017.epil = phi i64 [ %20, %.lr.ph.epil ], [ %.017.unr, %._crit_edge.loopexit.unr-lcssa ]
  %.01016.epil = phi i64 [ %18, %.lr.ph.epil ], [ %.01016.unr, %._crit_edge.loopexit.unr-lcssa ]
  %.01115.epil = phi i64 [ %19, %.lr.ph.epil ], [ %.01115.unr, %._crit_edge.loopexit.unr-lcssa ]
  %epil.iter = phi i64 [ %epil.iter.next, %.lr.ph.epil ], [ 0, %._crit_edge.loopexit.unr-lcssa ]
  %18 = mul nuw nsw i64 %.017.epil, %.01016.epil
  %19 = mul nsw i64 %.01115.epil, %indvars.iv.epil
  %20 = add nuw nsw i64 %.017.epil, 1
  %indvars.iv.next.epil = add 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.loopexit, label %.lr.ph.epil, !llvm.loop !7

._crit_edge.loopexit:                             ; preds = %.lr.ph.epil, %._crit_edge.loopexit.unr-lcssa
  %.lcssa23 = phi i64 [ %.lcssa23.ph, %._crit_edge.loopexit.unr-lcssa ], [ %18, %.lr.ph.epil ]
  %.lcssa = phi i64 [ %.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %19, %.lr.ph.epil ]
  %21 = sdiv i64 %.lcssa, %.lcssa23
  %22 = trunc i64 %21 to i32
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %2
  %23 = phi i32 [ 1, %2 ], [ %22, %._crit_edge.loopexit ]
  ret i32 %23
}

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" }

!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 = distinct !{!7, !8}
!8 = !{!"llvm.loop.unroll.disable"}


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