; LLVM IR from DionysiosB/CodeForces :: 0600-0699/678D-ItearatedLinearFunction-OLD.ll (Z6modInvxx)

; 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 uwtable
define dso_local noundef i64 @_Z6modInvxx(i64 noundef %0, i64 noundef %1) #0 {
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  store i64 %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !5
  %6 = load i64, ptr %5, align 8, !tbaa !5
  %7 = load i64, ptr %4, align 8, !tbaa !5
  %8 = srem i64 %7, %6
  store i64 %8, ptr %4, align 8, !tbaa !5
  %9 = load i64, ptr %4, align 8, !tbaa !5
  %10 = icmp sle i64 %9, 0
  br i1 %10, label %11, label %12

11:                                               ; preds = %2
  store i64 0, ptr %3, align 8
  br label %34

12:                                               ; preds = %2
  %13 = load i64, ptr %4, align 8, !tbaa !5
  %14 = icmp eq i64 %13, 1
  br i1 %14, label %15, label %16

15:                                               ; preds = %12
  store i64 1, ptr %3, align 8
  br label %34

16:                                               ; preds = %12
  br label %17

17:                                               ; preds = %16
  %18 = load i64, ptr %5, align 8, !tbaa !5
  %19 = mul nsw i64 2, %18
  %20 = load i64, ptr %5, align 8, !tbaa !5
  %21 = load i64, ptr %4, align 8, !tbaa !5
  %22 = sdiv i64 %20, %21
  %23 = load i64, ptr %5, align 8, !tbaa !5
  %24 = load i64, ptr %4, align 8, !tbaa !5
  %25 = srem i64 %23, %24
  %26 = load i64, ptr %5, align 8, !tbaa !5
  %27 = call noundef i64 @_Z6modInvxx(i64 noundef %25, i64 noundef %26)
  %28 = mul nsw i64 %22, %27
  %29 = load i64, ptr %5, align 8, !tbaa !5
  %30 = srem i64 %28, %29
  %31 = sub nsw i64 %19, %30
  %32 = load i64, ptr %5, align 8, !tbaa !5
  %33 = srem i64 %31, %32
  store i64 %33, ptr %3, align 8
  br label %34

34:                                               ; preds = %17, %15, %11
  %35 = load i64, ptr %3, align 8
  ret i64 %35
}

attributes #0 = { mustprogress 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"}


; 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 nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i64 @_Z6modInvxx(i64 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = srem i64 %0, %1
  %4 = icmp slt i64 %3, 1
  br i1 %4, label %common.ret14, label %5

5:                                                ; preds = %2
  %6 = icmp eq i64 %3, 1
  br i1 %6, label %common.ret14, label %7

common.ret14:                                     ; preds = %5, %2, %7
  %common.ret14.op = phi i64 [ %15, %7 ], [ 0, %2 ], [ 1, %5 ]
  ret i64 %common.ret14.op

7:                                                ; preds = %5
  %8 = shl nsw i64 %1, 1
  %9 = sdiv i64 %1, %3
  %10 = srem i64 %1, %3
  %11 = tail call noundef i64 @_Z6modInvxx(i64 noundef %10, i64 noundef %1)
  %12 = mul nsw i64 %11, %9
  %13 = srem i64 %12, %1
  %14 = sub nsw i64 %8, %13
  %15 = srem i64 %14, %1
  br label %common.ret14
}

attributes #0 = { mustprogress nofree 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)"}


; Effective O3 passes: GlobalOptPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass