; LLVM IR from Shah-Shishir/Codeforces-Solutions :: 742A - Arpa’s hard exam and Mehrdad’s naive cheat.ll (Z6bigmodiii)

; 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: mustprogress uwtable
define dso_local noundef i32 @_Z6bigmodiii(i32 noundef %0, i32 noundef %1, i32 noundef %2) #1 {
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store i32 %0, ptr %5, align 4, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %11 = load i32, ptr %6, align 4, !tbaa !5
  %12 = icmp eq i32 %11, 0
  br i1 %12, label %13, label %14

13:                                               ; preds = %3
  store i32 1, ptr %4, align 4
  store i32 1, ptr %10, align 4
  br label %54

14:                                               ; preds = %3
  %15 = load i32, ptr %6, align 4, !tbaa !5
  %16 = and i32 %15, 1
  %17 = icmp ne i32 %16, 0
  br i1 %17, label %18, label %34

18:                                               ; preds = %14
  %19 = load i32, ptr %5, align 4, !tbaa !5
  %20 = load i32, ptr %7, align 4, !tbaa !5
  %21 = srem i32 %19, %20
  store i32 %21, ptr %8, align 4, !tbaa !5
  %22 = load i32, ptr %5, align 4, !tbaa !5
  %23 = load i32, ptr %6, align 4, !tbaa !5
  %24 = sub nsw i32 %23, 1
  %25 = load i32, ptr %7, align 4, !tbaa !5
  %26 = call noundef i32 @_Z6bigmodiii(i32 noundef %22, i32 noundef %24, i32 noundef %25)
  %27 = load i32, ptr %7, align 4, !tbaa !5
  %28 = srem i32 %26, %27
  store i32 %28, ptr %9, align 4, !tbaa !5
  %29 = load i32, ptr %8, align 4, !tbaa !5
  %30 = load i32, ptr %9, align 4, !tbaa !5
  %31 = mul nsw i32 %29, %30
  %32 = load i32, ptr %7, align 4, !tbaa !5
  %33 = srem i32 %31, %32
  store i32 %33, ptr %4, align 4
  store i32 1, ptr %10, align 4
  br label %54

34:                                               ; preds = %14
  %35 = load i32, ptr %6, align 4, !tbaa !5
  %36 = srem i32 %35, 2
  %37 = icmp eq i32 %36, 0
  br i1 %37, label %38, label %51

38:                                               ; preds = %34
  %39 = load i32, ptr %5, align 4, !tbaa !5
  %40 = load i32, ptr %6, align 4, !tbaa !5
  %41 = sdiv i32 %40, 2
  %42 = load i32, ptr %7, align 4, !tbaa !5
  %43 = call noundef i32 @_Z6bigmodiii(i32 noundef %39, i32 noundef %41, i32 noundef %42)
  %44 = load i32, ptr %7, align 4, !tbaa !5
  %45 = srem i32 %43, %44
  store i32 %45, ptr %8, align 4, !tbaa !5
  %46 = load i32, ptr %8, align 4, !tbaa !5
  %47 = load i32, ptr %8, align 4, !tbaa !5
  %48 = mul nsw i32 %46, %47
  %49 = load i32, ptr %7, align 4, !tbaa !5
  %50 = srem i32 %48, %49
  store i32 %50, ptr %4, align 4
  store i32 1, ptr %10, align 4
  br label %54

51:                                               ; preds = %34
  br label %52

52:                                               ; preds = %51
  br label %53

53:                                               ; preds = %52
  unreachable

54:                                               ; preds = %38, %18, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  %55 = load i32, ptr %4, align 4
  ret i32 %55
}

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

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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" }
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"}


; 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 i32 @_Z6bigmodiii(i32 noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp eq i32 %1, 0
  br i1 %4, label %common.ret, label %5

5:                                                ; preds = %3
  %6 = and i32 %1, 1
  %.not = icmp eq i32 %6, 0
  br i1 %.not, label %14, label %8

common.ret.sink.split:                            ; preds = %8, %14
  %.sink = phi i32 [ %18, %14 ], [ %13, %8 ]
  %7 = srem i32 %.sink, %2
  br label %common.ret

common.ret:                                       ; preds = %common.ret.sink.split, %3
  %common.ret.op = phi i32 [ 1, %3 ], [ %7, %common.ret.sink.split ]
  ret i32 %common.ret.op

8:                                                ; preds = %5
  %9 = srem i32 %0, %2
  %10 = add nsw i32 %1, -1
  %11 = tail call noundef i32 @_Z6bigmodiii(i32 noundef %0, i32 noundef %10, i32 noundef %2)
  %12 = srem i32 %11, %2
  %13 = mul nsw i32 %12, %9
  br label %common.ret.sink.split

14:                                               ; preds = %5
  %15 = ashr exact i32 %1, 1
  %16 = tail call noundef i32 @_Z6bigmodiii(i32 noundef %0, i32 noundef %15, i32 noundef %2)
  %17 = srem i32 %16, %2
  %18 = mul nsw i32 %17, %17
  br label %common.ret.sink.split
}

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,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass