; LLVM IR from Tudor67/Competitive-Programming :: Codeforces/#697#div3/E/E.ll (Z10modInversexRKi)

; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z10modInversexRKi(i64 noundef %0, ptr noundef nonnull align 4 dereferenceable(4) %1) #1 {
  %3 = alloca i64, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %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 4, ptr %5) #2
  %7 = load ptr, ptr %4, align 8, !tbaa !9
  %8 = load i32, ptr %7, align 4, !tbaa !11
  %9 = sub nsw i32 %8, 2
  store i32 %9, ptr %5, align 4, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 1, ptr %6, align 4, !tbaa !11
  br label %10

10:                                               ; preds = %27, %2
  %11 = load i32, ptr %5, align 4, !tbaa !11
  %12 = icmp ne i32 %11, 0
  br i1 %12, label %13, label %37

13:                                               ; preds = %10
  %14 = load i32, ptr %5, align 4, !tbaa !11
  %15 = and i32 %14, 1
  %16 = icmp ne i32 %15, 0
  br i1 %16, label %17, label %27

17:                                               ; preds = %13
  %18 = load i32, ptr %6, align 4, !tbaa !11
  %19 = sext i32 %18 to i64
  %20 = load i64, ptr %3, align 8, !tbaa !5
  %21 = mul nsw i64 %19, %20
  %22 = load ptr, ptr %4, align 8, !tbaa !9
  %23 = load i32, ptr %22, align 4, !tbaa !11
  %24 = sext i32 %23 to i64
  %25 = srem i64 %21, %24
  %26 = trunc i64 %25 to i32
  store i32 %26, ptr %6, align 4, !tbaa !11
  br label %27

27:                                               ; preds = %17, %13
  %28 = load i64, ptr %3, align 8, !tbaa !5
  %29 = load i64, ptr %3, align 8, !tbaa !5
  %30 = mul nsw i64 %28, %29
  %31 = load ptr, ptr %4, align 8, !tbaa !9
  %32 = load i32, ptr %31, align 4, !tbaa !11
  %33 = sext i32 %32 to i64
  %34 = srem i64 %30, %33
  store i64 %34, ptr %3, align 8, !tbaa !5
  %35 = load i32, ptr %5, align 4, !tbaa !11
  %36 = ashr i32 %35, 1
  store i32 %36, ptr %5, align 4, !tbaa !11
  br label %10, !llvm.loop !13

37:                                               ; preds = %10
  %38 = load i32, ptr %6, align 4, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret i32 %38
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 range(i32 -2147483647, -2147483648) i32 @_Z10modInversexRKi(i64 noundef %0, ptr nocapture noundef nonnull readonly align 4 dereferenceable(4) %1) local_unnamed_addr #0 {
  %3 = load i32, ptr %1, align 4, !tbaa !5
  %4 = add nsw i32 %3, -2
  %.not13 = icmp eq i32 %4, 0
  br i1 %.not13, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2
  %5 = sext i32 %3 to i64
  br label %6

6:                                                ; preds = %.lr.ph, %13
  %.016 = phi i32 [ 1, %.lr.ph ], [ %.1, %13 ]
  %.01015 = phi i32 [ %4, %.lr.ph ], [ %16, %13 ]
  %.01114 = phi i64 [ %0, %.lr.ph ], [ %15, %13 ]
  %7 = and i32 %.01015, 1
  %.not12 = icmp eq i32 %7, 0
  br i1 %.not12, label %13, label %8

8:                                                ; preds = %6
  %9 = sext i32 %.016 to i64
  %10 = mul nsw i64 %.01114, %9
  %11 = srem i64 %10, %5
  %12 = trunc nsw i64 %11 to i32
  br label %13

13:                                               ; preds = %8, %6
  %.1 = phi i32 [ %12, %8 ], [ %.016, %6 ]
  %14 = mul nsw i64 %.01114, %.01114
  %15 = srem i64 %14, %5
  %16 = ashr i32 %.01015, 1
  %.not = icmp ult i32 %.01015, 2
  br i1 %.not, label %._crit_edge, label %6, !llvm.loop !9

._crit_edge:                                      ; preds = %13, %2
  %.0.lcssa = phi i32 [ 1, %2 ], [ %.1, %13 ]
  ret i32 %.0.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 = !{!"int", !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,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass