; LLVM IR from tangjz/acm-icpc :: buaa/oj3rd/1089.ll (Z3powei)

; 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 x86_fp80 @_Z3powei(x86_fp80 noundef %0, i32 noundef %1) #0 {
  %3 = alloca x86_fp80, align 16
  %4 = alloca x86_fp80, align 16
  %5 = alloca i32, align 4
  %6 = alloca x86_fp80, align 16
  store x86_fp80 %0, ptr %4, align 16, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  %7 = load i32, ptr %5, align 4, !tbaa !9
  %8 = icmp slt i32 %7, 0
  br i1 %8, label %9, label %10

9:                                                ; preds = %2
  store x86_fp80 0xK00000000000000000000, ptr %3, align 16
  br label %30

10:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 16, ptr %6) #2
  store x86_fp80 0xK3FFF8000000000000000, ptr %6, align 16, !tbaa !5
  br label %11

11:                                               ; preds = %22, %10
  %12 = load i32, ptr %5, align 4, !tbaa !9
  %13 = icmp ne i32 %12, 0
  br i1 %13, label %14, label %28

14:                                               ; preds = %11
  %15 = load i32, ptr %5, align 4, !tbaa !9
  %16 = and i32 %15, 1
  %17 = icmp ne i32 %16, 0
  br i1 %17, label %18, label %22

18:                                               ; preds = %14
  %19 = load x86_fp80, ptr %6, align 16, !tbaa !5
  %20 = load x86_fp80, ptr %4, align 16, !tbaa !5
  %21 = fmul x86_fp80 %19, %20
  store x86_fp80 %21, ptr %6, align 16, !tbaa !5
  br label %22

22:                                               ; preds = %18, %14
  %23 = load x86_fp80, ptr %4, align 16, !tbaa !5
  %24 = load x86_fp80, ptr %4, align 16, !tbaa !5
  %25 = fmul x86_fp80 %23, %24
  store x86_fp80 %25, ptr %4, align 16, !tbaa !5
  %26 = load i32, ptr %5, align 4, !tbaa !9
  %27 = ashr i32 %26, 1
  store i32 %27, ptr %5, align 4, !tbaa !9
  br label %11, !llvm.loop !11

28:                                               ; preds = %11
  %29 = load x86_fp80, ptr %6, align 16, !tbaa !5
  store x86_fp80 %29, ptr %3, align 16
  call void @llvm.lifetime.end.p0(i64 16, ptr %6) #2
  br label %30

30:                                               ; preds = %28, %9
  %31 = load x86_fp80, ptr %3, align 16
  ret x86_fp80 %31
}

; 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 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 x86_fp80 @_Z3powei(x86_fp80 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp slt i32 %1, 0
  br i1 %3, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %2
  %.not14 = icmp eq i32 %1, 0
  br i1 %.not14, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.017 = phi x86_fp80 [ %spec.select, %.lr.ph ], [ 0xK3FFF8000000000000000, %.preheader ]
  %.01016 = phi i32 [ %7, %.lr.ph ], [ %1, %.preheader ]
  %.01115 = phi x86_fp80 [ %6, %.lr.ph ], [ %0, %.preheader ]
  %4 = and i32 %.01016, 1
  %.not13 = icmp eq i32 %4, 0
  %5 = fmul x86_fp80 %.01115, %.017
  %spec.select = select i1 %.not13, x86_fp80 %.017, x86_fp80 %5
  %6 = fmul x86_fp80 %.01115, %.01115
  %7 = lshr i32 %.01016, 1
  %.not = icmp ult i32 %.01016, 2
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !5

.loopexit:                                        ; preds = %.lr.ph, %.preheader, %2
  %.09 = phi x86_fp80 [ 0xK00000000000000000000, %2 ], [ 0xK3FFF8000000000000000, %.preheader ], [ %spec.select, %.lr.ph ]
  ret x86_fp80 %.09
}

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,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass