; LLVM IR from pranjalwalia/Competitive-programming :: mat/number_theory/exponentiation/power.ll (Z4pow2xx)

; 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 @_Z4pow2xx(i64 noundef %0, i64 noundef %1) #0 {
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  store i64 %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !5
  %7 = load i64, ptr %5, align 8, !tbaa !5
  %8 = icmp eq i64 %7, 0
  br i1 %8, label %9, label %10

9:                                                ; preds = %2
  store i64 1, ptr %3, align 8
  br label %29

10:                                               ; preds = %2
  %11 = load i64, ptr %5, align 8, !tbaa !5
  %12 = srem i64 %11, 2
  %13 = icmp eq i64 %12, 0
  br i1 %13, label %14, label %22

14:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %15 = load i64, ptr %4, align 8, !tbaa !5
  %16 = load i64, ptr %5, align 8, !tbaa !5
  %17 = sdiv i64 %16, 2
  %18 = call noundef i64 @_Z4pow2xx(i64 noundef %15, i64 noundef %17)
  store i64 %18, ptr %6, align 8, !tbaa !5
  %19 = load i64, ptr %6, align 8, !tbaa !5
  %20 = load i64, ptr %6, align 8, !tbaa !5
  %21 = mul nsw i64 %19, %20
  store i64 %21, ptr %3, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %29

22:                                               ; preds = %10
  %23 = load i64, ptr %4, align 8, !tbaa !5
  %24 = load i64, ptr %4, align 8, !tbaa !5
  %25 = load i64, ptr %5, align 8, !tbaa !5
  %26 = sub nsw i64 %25, 1
  %27 = call noundef i64 @_Z4pow2xx(i64 noundef %24, i64 noundef %26)
  %28 = mul nsw i64 %23, %27
  store i64 %28, ptr %3, align 8
  br label %29

29:                                               ; preds = %22, %14, %9
  %30 = load i64, ptr %3, align 8
  ret i64 %30
}

; 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 @_Z4pow2xx(i64 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq i64 %1, 0
  br i1 %3, label %common.ret25, label %.lr.ph

.lr.ph:                                           ; preds = %2
  %4 = and i64 %1, 1
  %5 = icmp eq i64 %4, 0
  br i1 %5, label %.lr.ph.1, label %tailrecurse

common.ret25:                                     ; preds = %2, %tailrecurse, %.lr.ph.1
  %common.ret25.op = phi i64 [ %accumulator.ret.tr, %.lr.ph.1 ], [ 1, %2 ], [ %0, %tailrecurse ]
  ret i64 %common.ret25.op

.lr.ph.1:                                         ; preds = %tailrecurse, %.lr.ph
  %.tr1116.lcssa = phi i64 [ %1, %.lr.ph ], [ %9, %tailrecurse ]
  %accumulator.tr15.lcssa = phi i64 [ 1, %.lr.ph ], [ %0, %tailrecurse ]
  %6 = ashr exact i64 %.tr1116.lcssa, 1
  %7 = tail call noundef i64 @_Z4pow2xx(i64 noundef %0, i64 noundef %6)
  %8 = mul i64 %7, %accumulator.tr15.lcssa
  %accumulator.ret.tr = mul i64 %8, %7
  br label %common.ret25

tailrecurse:                                      ; preds = %.lr.ph
  %9 = add nsw i64 %1, -1
  %10 = icmp eq i64 %9, 0
  br i1 %10, label %common.ret25, label %.lr.ph.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: GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass