; LLVM IR from priyankchheda/algorithms :: _other_languages/cpp/Maths/modular_exponential.ll (Z19mod_power_recursivexxx)

; 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 @_Z19mod_power_recursivexxx(i64 noundef %0, i64 noundef %1, i64 noundef %2) #0 {
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  %8 = alloca i64, align 8
  %9 = alloca i32, align 4
  store i64 %0, ptr %5, align 8, !tbaa !5
  store i64 %1, ptr %6, align 8, !tbaa !5
  store i64 %2, ptr %7, align 8, !tbaa !5
  %10 = load i64, ptr %6, align 8, !tbaa !5
  %11 = icmp eq i64 %10, 0
  br i1 %11, label %12, label %13

12:                                               ; preds = %3
  store i64 1, ptr %4, align 8
  br label %47

13:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %14 = load i64, ptr %5, align 8, !tbaa !5
  %15 = load i64, ptr %6, align 8, !tbaa !5
  %16 = sdiv i64 %15, 2
  %17 = load i64, ptr %7, align 8, !tbaa !5
  %18 = call noundef i64 @_Z19mod_power_recursivexxx(i64 noundef %14, i64 noundef %16, i64 noundef %17)
  store i64 %18, ptr %8, align 8, !tbaa !5
  %19 = load i64, ptr %6, align 8, !tbaa !5
  %20 = srem i64 %19, 2
  %21 = icmp eq i64 %20, 0
  br i1 %21, label %22, label %32

22:                                               ; preds = %13
  %23 = load i64, ptr %8, align 8, !tbaa !5
  %24 = load i64, ptr %7, align 8, !tbaa !5
  %25 = srem i64 %23, %24
  %26 = load i64, ptr %8, align 8, !tbaa !5
  %27 = load i64, ptr %7, align 8, !tbaa !5
  %28 = srem i64 %26, %27
  %29 = mul nsw i64 %25, %28
  %30 = load i64, ptr %7, align 8, !tbaa !5
  %31 = srem i64 %29, %30
  store i64 %31, ptr %4, align 8
  store i32 1, ptr %9, align 4
  br label %46

32:                                               ; preds = %13
  %33 = load i64, ptr %5, align 8, !tbaa !5
  %34 = load i64, ptr %7, align 8, !tbaa !5
  %35 = srem i64 %33, %34
  %36 = load i64, ptr %8, align 8, !tbaa !5
  %37 = load i64, ptr %7, align 8, !tbaa !5
  %38 = srem i64 %36, %37
  %39 = mul nsw i64 %35, %38
  %40 = load i64, ptr %8, align 8, !tbaa !5
  %41 = load i64, ptr %7, align 8, !tbaa !5
  %42 = srem i64 %40, %41
  %43 = mul nsw i64 %39, %42
  %44 = load i64, ptr %7, align 8, !tbaa !5
  %45 = srem i64 %43, %44
  store i64 %45, ptr %4, align 8
  store i32 1, ptr %9, align 4
  br label %46

46:                                               ; preds = %32, %22
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  br label %47

47:                                               ; preds = %46, %12
  %48 = load i64, ptr %4, align 8
  ret i64 %48
}

; 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 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"}


; 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 @_Z19mod_power_recursivexxx(i64 noundef %0, i64 noundef %1, i64 noundef %2) local_unnamed_addr #0 {
  %4 = icmp eq i64 %1, 0
  br i1 %4, label %19, label %5

5:                                                ; preds = %3
  %6 = sdiv i64 %1, 2
  %7 = tail call noundef i64 @_Z19mod_power_recursivexxx(i64 noundef %0, i64 noundef %6, i64 noundef %2)
  %8 = and i64 %1, 1
  %9 = icmp eq i64 %8, 0
  br i1 %9, label %10, label %13

10:                                               ; preds = %5
  %11 = srem i64 %7, %2
  %12 = mul nsw i64 %11, %11
  br label %18

13:                                               ; preds = %5
  %14 = srem i64 %0, %2
  %15 = srem i64 %7, %2
  %16 = mul nsw i64 %15, %14
  %17 = mul nsw i64 %16, %15
  br label %18

18:                                               ; preds = %13, %10
  %.pn = phi i64 [ %12, %10 ], [ %17, %13 ]
  %.0 = srem i64 %.pn, %2
  br label %19

19:                                               ; preds = %3, %18
  %.1 = phi i64 [ %.0, %18 ], [ 1, %3 ]
  ret i64 %.1
}

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: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass