; LLVM IR from ayush-tulsyan/ACM-ICPC-Handbook :: code/FastExpo.ll (Z5powerdi)

; 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 nounwind uwtable
define dso_local noundef double @_Z5powerdi(double noundef %0, i32 noundef %1) #0 {
  %3 = alloca double, align 8
  %4 = alloca i32, align 4
  %5 = alloca double, align 8
  store double %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store double 1.000000e+00, ptr %5, align 8, !tbaa !5
  br label %6

6:                                                ; preds = %17, %2
  %7 = load i32, ptr %4, align 4, !tbaa !9
  %8 = icmp ne i32 %7, 0
  br i1 %8, label %9, label %23

9:                                                ; preds = %6
  %10 = load i32, ptr %4, align 4, !tbaa !9
  %11 = and i32 %10, 1
  %12 = icmp ne i32 %11, 0
  br i1 %12, label %13, label %17

13:                                               ; preds = %9
  %14 = load double, ptr %3, align 8, !tbaa !5
  %15 = load double, ptr %5, align 8, !tbaa !5
  %16 = fmul double %15, %14
  store double %16, ptr %5, align 8, !tbaa !5
  br label %17

17:                                               ; preds = %13, %9
  %18 = load i32, ptr %4, align 4, !tbaa !9
  %19 = ashr i32 %18, 1
  store i32 %19, ptr %4, align 4, !tbaa !9
  %20 = load double, ptr %3, align 8, !tbaa !5
  %21 = load double, ptr %3, align 8, !tbaa !5
  %22 = fmul double %21, %20
  store double %22, ptr %3, align 8, !tbaa !5
  br label %6, !llvm.loop !11

23:                                               ; preds = %6
  %24 = load double, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret double %24
}

; 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 = !{!"double", !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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef double @_Z5powerdi(double noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %.not10 = icmp eq i32 %1, 0
  br i1 %.not10, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %.lr.ph
  %.013 = phi double [ %.1, %.lr.ph ], [ 1.000000e+00, %2 ]
  %.0712 = phi i32 [ %5, %.lr.ph ], [ %1, %2 ]
  %.0811 = phi double [ %6, %.lr.ph ], [ %0, %2 ]
  %3 = and i32 %.0712, 1
  %.not9 = icmp eq i32 %3, 0
  %4 = fmul double %.0811, %.013
  %.1 = select i1 %.not9, double %.013, double %4
  %5 = ashr i32 %.0712, 1
  %6 = fmul double %.0811, %.0811
  %.not = icmp ult i32 %.0712, 2
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5

._crit_edge:                                      ; preds = %.lr.ph, %2
  %.0.lcssa = phi double [ 1.000000e+00, %2 ], [ %.1, %.lr.ph ]
  ret double %.0.lcssa
}

attributes #0 = { mustprogress nofree norecurse 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)"}
!5 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass