; LLVM IR from Leet-Us-Code/DSA-A-Z-Practice :: Sid's Contests/Codechef contests/July Long Challenge/Chef Vs Bharat.ll (Z8powerModxx)

; 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"

@mod = external dso_local global i64, align 8

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z8powerModxx(i64 noundef %0, i64 noundef %1) #0 {
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i64 %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 1, ptr %6, align 4, !tbaa !9
  %8 = load i64, ptr %4, align 8, !tbaa !5
  %9 = load i64, ptr @mod, align 8, !tbaa !5
  %10 = srem i64 %8, %9
  store i64 %10, ptr %4, align 8, !tbaa !5
  %11 = load i64, ptr %4, align 8, !tbaa !5
  %12 = icmp eq i64 %11, 0
  br i1 %12, label %13, label %14

13:                                               ; preds = %2
  store i64 0, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %41

14:                                               ; preds = %2
  br label %15

15:                                               ; preds = %30, %14
  %16 = load i64, ptr %5, align 8, !tbaa !5
  %17 = icmp sgt i64 %16, 0
  br i1 %17, label %18, label %38

18:                                               ; preds = %15
  %19 = load i64, ptr %5, align 8, !tbaa !5
  %20 = and i64 %19, 1
  %21 = icmp ne i64 %20, 0
  br i1 %21, label %22, label %30

22:                                               ; preds = %18
  %23 = load i32, ptr %6, align 4, !tbaa !9
  %24 = sext i32 %23 to i64
  %25 = load i64, ptr %4, align 8, !tbaa !5
  %26 = mul nsw i64 %24, %25
  %27 = load i64, ptr @mod, align 8, !tbaa !5
  %28 = srem i64 %26, %27
  %29 = trunc i64 %28 to i32
  store i32 %29, ptr %6, align 4, !tbaa !9
  br label %30

30:                                               ; preds = %22, %18
  %31 = load i64, ptr %5, align 8, !tbaa !5
  %32 = ashr i64 %31, 1
  store i64 %32, ptr %5, align 8, !tbaa !5
  %33 = load i64, ptr %4, align 8, !tbaa !5
  %34 = load i64, ptr %4, align 8, !tbaa !5
  %35 = mul nsw i64 %33, %34
  %36 = load i64, ptr @mod, align 8, !tbaa !5
  %37 = srem i64 %35, %36
  store i64 %37, ptr %4, align 8, !tbaa !5
  br label %15, !llvm.loop !11

38:                                               ; preds = %15
  %39 = load i32, ptr %6, align 4, !tbaa !9
  %40 = sext i32 %39 to i64
  store i64 %40, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %41

41:                                               ; preds = %38, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %42 = load i64, ptr %3, align 8
  ret i64 %42
}

; 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 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

@mod = external dso_local local_unnamed_addr global i64, align 8

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef range(i64 -2147483648, 2147483648) i64 @_Z8powerModxx(i64 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = load i64, ptr @mod, align 8, !tbaa !5
  %4 = srem i64 %0, %3
  %5 = icmp eq i64 %4, 0
  br i1 %5, label %._crit_edge, label %.preheader

.preheader:                                       ; preds = %2
  %6 = icmp sgt i64 %1, 0
  br i1 %6, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %.preheader, %13
  %.017 = phi i32 [ %.1, %13 ], [ 1, %.preheader ]
  %.01116 = phi i64 [ %14, %13 ], [ %1, %.preheader ]
  %.01215 = phi i64 [ %16, %13 ], [ %4, %.preheader ]
  %7 = and i64 %.01116, 1
  %.not = icmp eq i64 %7, 0
  br i1 %.not, label %13, label %8

8:                                                ; preds = %.lr.ph
  %9 = sext i32 %.017 to i64
  %10 = mul nsw i64 %.01215, %9
  %11 = srem i64 %10, %3
  %12 = trunc i64 %11 to i32
  br label %13

13:                                               ; preds = %8, %.lr.ph
  %.1 = phi i32 [ %12, %8 ], [ %.017, %.lr.ph ]
  %14 = lshr i64 %.01116, 1
  %15 = mul nsw i64 %.01215, %.01215
  %16 = srem i64 %15, %3
  %.not18 = icmp ult i64 %.01116, 2
  br i1 %.not18, label %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !9

._crit_edge.loopexit:                             ; preds = %13
  %17 = sext i32 %.1 to i64
  br label %._crit_edge

._crit_edge:                                      ; preds = %.preheader, %._crit_edge.loopexit, %2
  %.013 = phi i64 [ 0, %2 ], [ 1, %.preheader ], [ %17, %._crit_edge.loopexit ]
  ret i64 %.013
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: 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)"}
!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