; LLVM IR from Tudor67/Competitive-Programming :: Codeforces/#672#div2/D/D.ll (Z10modInversexRKx)

; 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 @_Z10modInversexRKx(i64 noundef %0, ptr noundef nonnull align 8 dereferenceable(8) %1) #0 {
  %3 = alloca i64, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i64, align 8
  %6 = alloca i32, align 4
  store i64 %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store i64 1, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %7 = load ptr, ptr %4, align 8, !tbaa !9
  %8 = load i64, ptr %7, align 8, !tbaa !5
  %9 = sub nsw i64 %8, 2
  %10 = trunc i64 %9 to i32
  store i32 %10, ptr %6, align 4, !tbaa !11
  %11 = load ptr, ptr %4, align 8, !tbaa !9
  %12 = load i64, ptr %11, align 8, !tbaa !5
  %13 = load i64, ptr %3, align 8, !tbaa !5
  %14 = srem i64 %13, %12
  store i64 %14, ptr %3, align 8, !tbaa !5
  br label %15

15:                                               ; preds = %29, %2
  %16 = load i32, ptr %6, align 4, !tbaa !11
  %17 = icmp sgt i32 %16, 0
  br i1 %17, label %18, label %38

18:                                               ; preds = %15
  %19 = load i32, ptr %6, align 4, !tbaa !11
  %20 = and i32 %19, 1
  %21 = icmp ne i32 %20, 0
  br i1 %21, label %22, label %29

22:                                               ; preds = %18
  %23 = load i64, ptr %5, align 8, !tbaa !5
  %24 = load i64, ptr %3, align 8, !tbaa !5
  %25 = mul nsw i64 %23, %24
  %26 = load ptr, ptr %4, align 8, !tbaa !9
  %27 = load i64, ptr %26, align 8, !tbaa !5
  %28 = srem i64 %25, %27
  store i64 %28, ptr %5, align 8, !tbaa !5
  br label %29

29:                                               ; preds = %22, %18
  %30 = load i64, ptr %3, align 8, !tbaa !5
  %31 = load i64, ptr %3, align 8, !tbaa !5
  %32 = mul nsw i64 %30, %31
  %33 = load ptr, ptr %4, align 8, !tbaa !9
  %34 = load i64, ptr %33, align 8, !tbaa !5
  %35 = srem i64 %32, %34
  store i64 %35, ptr %3, align 8, !tbaa !5
  %36 = load i32, ptr %6, align 4, !tbaa !11
  %37 = sdiv i32 %36, 2
  store i32 %37, ptr %6, align 4, !tbaa !11
  br label %15, !llvm.loop !13

38:                                               ; preds = %15
  %39 = load i64, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret i64 %39
}

; 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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !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 i64 @_Z10modInversexRKx(i64 noundef %0, ptr nocapture noundef nonnull readonly align 8 dereferenceable(8) %1) local_unnamed_addr #0 {
  %3 = load i64, ptr %1, align 8, !tbaa !5
  %4 = trunc i64 %3 to i32
  %5 = add i32 %4, -2
  %6 = icmp sgt i32 %5, 0
  br i1 %6, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2, %11
  %.pn = phi i64 [ %12, %11 ], [ %0, %2 ]
  %.016 = phi i32 [ %13, %11 ], [ %5, %2 ]
  %.01215 = phi i64 [ %.1, %11 ], [ 1, %2 ]
  %.01317 = srem i64 %.pn, %3
  %7 = and i32 %.016, 1
  %.not = icmp eq i32 %7, 0
  br i1 %.not, label %11, label %8

8:                                                ; preds = %.lr.ph
  %9 = mul nsw i64 %.01317, %.01215
  %10 = srem i64 %9, %3
  br label %11

11:                                               ; preds = %8, %.lr.ph
  %.1 = phi i64 [ %10, %8 ], [ %.01215, %.lr.ph ]
  %12 = mul nsw i64 %.01317, %.01317
  %13 = lshr i32 %.016, 1
  %.not18 = icmp ult i32 %.016, 2
  br i1 %.not18, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %11, %2
  %.012.lcssa = phi i64 [ 1, %2 ], [ %.1, %11 ]
  ret i64 %.012.lcssa
}

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: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass