; LLVM IR from lzyrapx/Competitive-Programming :: HDUOJ/4609（FFT）.ll (Z4ConvP7Complexi)

; 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"

%struct.Complex = type { double, double }

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z3FFTP7Complexii(ptr noundef, i32 noundef, i32 noundef) #1

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #2

; Function Attrs: mustprogress uwtable
declare dso_local { double, double } @_ZN7ComplexmlERKS_(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 8 dereferenceable(16)) #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_Z4ConvP7Complexi(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca %struct.Complex, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  %7 = load ptr, ptr %3, align 8, !tbaa !5
  %8 = load i32, ptr %4, align 4, !tbaa !9
  call void @_Z3FFTP7Complexii(ptr noundef %7, i32 noundef %8, i32 noundef 1)
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !9
  br label %9

9:                                                ; preds = %32, %2
  %10 = load i32, ptr %5, align 4, !tbaa !9
  %11 = load i32, ptr %4, align 4, !tbaa !9
  %12 = icmp slt i32 %10, %11
  br i1 %12, label %14, label %13

13:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  br label %35

14:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 16, ptr %6) #3
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  %16 = load i32, ptr %5, align 4, !tbaa !9
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds %struct.Complex, ptr %15, i64 %17
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  %20 = load i32, ptr %5, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds %struct.Complex, ptr %19, i64 %21
  %23 = call { double, double } @_ZN7ComplexmlERKS_(ptr noundef nonnull align 8 dereferenceable(16) %18, ptr noundef nonnull align 8 dereferenceable(16) %22)
  %24 = getelementptr inbounds { double, double }, ptr %6, i32 0, i32 0
  %25 = extractvalue { double, double } %23, 0
  store double %25, ptr %24, align 8
  %26 = getelementptr inbounds { double, double }, ptr %6, i32 0, i32 1
  %27 = extractvalue { double, double } %23, 1
  store double %27, ptr %26, align 8
  %28 = load ptr, ptr %3, align 8, !tbaa !5
  %29 = load i32, ptr %5, align 4, !tbaa !9
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds %struct.Complex, ptr %28, i64 %30
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %31, ptr align 8 %6, i64 16, i1 false), !tbaa.struct !11
  call void @llvm.lifetime.end.p0(i64 16, ptr %6) #3
  br label %32

32:                                               ; preds = %14
  %33 = load i32, ptr %5, align 4, !tbaa !9
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %5, align 4, !tbaa !9
  br label %9, !llvm.loop !14

35:                                               ; preds = %13
  %36 = load ptr, ptr %3, align 8, !tbaa !5
  %37 = load i32, ptr %4, align 4, !tbaa !9
  call void @_Z3FFTP7Complexii(ptr noundef %36, i32 noundef %37, i32 noundef -1)
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{i64 0, i64 8, !12, i64 8, i64 8, !12}
!12 = !{!13, !13, i64 0}
!13 = !{!"double", !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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"

%struct.Complex = type { double, double }

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z3FFTP7Complexii(ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local { double, double } @_ZN7ComplexmlERKS_(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 8 dereferenceable(16)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local void @_Z4ConvP7Complexi(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  tail call void @_Z3FFTP7Complexii(ptr noundef %0, i32 noundef %1, i32 noundef 1)
  %3 = icmp sgt i32 %1, 0
  br i1 %3, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = zext nneg i32 %1 to i64
  br label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %2
  tail call void @_Z3FFTP7Complexii(ptr noundef %0, i32 noundef %1, i32 noundef -1)
  ret void

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %.lr.ph ]
  %4 = getelementptr inbounds %struct.Complex, ptr %0, i64 %indvars.iv
  %5 = tail call { double, double } @_ZN7ComplexmlERKS_(ptr noundef nonnull align 8 dereferenceable(16) %4, ptr noundef nonnull align 8 dereferenceable(16) %4)
  %6 = extractvalue { double, double } %5, 0
  %7 = extractvalue { double, double } %5, 1
  store double %6, ptr %4, align 8, !tbaa !5
  %.sroa.4.0..sroa_idx = getelementptr inbounds i8, ptr %4, i64 8
  store double %7, ptr %.sroa.4.0..sroa_idx, align 8, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9
}

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" }

!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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass