; LLVM IR from glotzerlab/hoomd-blue :: hoomd/extern/dfftlib/src/bare_fft.ll (Z10radix2_fftP8cpxfloatS0_ii13bare_fft_plan)

; 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.bare_fft_plan = type { i32, i32, i32, i32, i32, i32 }
%struct.cpxfloat = type { float, float }

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z5four1P8cpxfloatS0_iiii(ptr noundef, ptr noundef, i32 noundef, i32 noundef, i32 noundef, i32 noundef) #0

; 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

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z10radix2_fftP8cpxfloatS0_ii13bare_fft_plan(ptr noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3, ptr noundef byval(%struct.bare_fft_plan) align 8 %4) #0 {
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store ptr %0, ptr %6, align 8, !tbaa !5
  store ptr %1, ptr %7, align 8, !tbaa !5
  store i32 %2, ptr %8, align 4, !tbaa !9
  store i32 %3, ptr %9, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  store i32 0, ptr %10, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %38, %5
  %12 = load i32, ptr %10, align 4, !tbaa !9
  %13 = getelementptr inbounds %struct.bare_fft_plan, ptr %4, i32 0, i32 5
  %14 = load i32, ptr %13, align 4, !tbaa !11
  %15 = icmp slt i32 %12, %14
  br i1 %15, label %16, label %41

16:                                               ; preds = %11
  %17 = load ptr, ptr %6, align 8, !tbaa !5
  %18 = load i32, ptr %10, align 4, !tbaa !9
  %19 = getelementptr inbounds %struct.bare_fft_plan, ptr %4, i32 0, i32 3
  %20 = load i32, ptr %19, align 4, !tbaa !13
  %21 = mul nsw i32 %18, %20
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds %struct.cpxfloat, ptr %17, i64 %22
  %24 = load ptr, ptr %7, align 8, !tbaa !5
  %25 = load i32, ptr %10, align 4, !tbaa !9
  %26 = getelementptr inbounds %struct.bare_fft_plan, ptr %4, i32 0, i32 4
  %27 = load i32, ptr %26, align 8, !tbaa !14
  %28 = mul nsw i32 %25, %27
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds %struct.cpxfloat, ptr %24, i64 %29
  %31 = getelementptr inbounds %struct.bare_fft_plan, ptr %4, i32 0, i32 0
  %32 = load i32, ptr %31, align 8, !tbaa !15
  %33 = load i32, ptr %9, align 4, !tbaa !9
  %34 = getelementptr inbounds %struct.bare_fft_plan, ptr %4, i32 0, i32 1
  %35 = load i32, ptr %34, align 4, !tbaa !16
  %36 = getelementptr inbounds %struct.bare_fft_plan, ptr %4, i32 0, i32 2
  %37 = load i32, ptr %36, align 8, !tbaa !17
  call void @_Z5four1P8cpxfloatS0_iiii(ptr noundef %23, ptr noundef %30, i32 noundef %32, i32 noundef %33, i32 noundef %35, i32 noundef %37)
  br label %38

38:                                               ; preds = %16
  %39 = load i32, ptr %10, align 4, !tbaa !9
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %10, align 4, !tbaa !9
  br label %11, !llvm.loop !18

41:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  ret void
}

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 = !{!"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 = !{!12, !10, i64 20}
!12 = !{!"_ZTS13bare_fft_plan", !10, i64 0, !10, i64 4, !10, i64 8, !10, i64 12, !10, i64 16, !10, i64 20}
!13 = !{!12, !10, i64 12}
!14 = !{!12, !10, i64 16}
!15 = !{!12, !10, i64 0}
!16 = !{!12, !10, i64 4}
!17 = !{!12, !10, i64 8}
!18 = distinct !{!18, !19}
!19 = !{!"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.bare_fft_plan = type { i32, i32, i32, i32, i32, i32 }
%struct.cpxfloat = type { float, float }

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_Z5four1P8cpxfloatS0_iiii(ptr noundef, ptr noundef, i32 noundef, i32 noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z10radix2_fftP8cpxfloatS0_ii13bare_fft_plan(ptr noundef %0, ptr noundef %1, i32 noundef %2, i32 noundef %3, ptr nocapture noundef readonly byval(%struct.bare_fft_plan) align 8 %4) local_unnamed_addr #0 {
  %6 = getelementptr inbounds i8, ptr %4, i64 20
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %8 = icmp sgt i32 %7, 0
  br i1 %8, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %5
  %9 = getelementptr inbounds i8, ptr %4, i64 12
  %10 = load i32, ptr %9, align 4, !tbaa !10
  %11 = getelementptr inbounds i8, ptr %4, i64 16
  %12 = load i32, ptr %11, align 8, !tbaa !11
  %13 = load i32, ptr %4, align 8, !tbaa !12
  %14 = getelementptr inbounds i8, ptr %4, i64 4
  %15 = load i32, ptr %14, align 4, !tbaa !13
  %16 = getelementptr inbounds i8, ptr %4, i64 8
  %17 = load i32, ptr %16, align 8, !tbaa !14
  %18 = sext i32 %10 to i64
  %19 = sext i32 %12 to i64
  %wide.trip.count = zext nneg i32 %7 to i64
  br label %20

20:                                               ; preds = %.lr.ph, %20
  %indvars.iv = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next, %20 ]
  %21 = mul nsw i64 %indvars.iv, %18
  %22 = getelementptr inbounds %struct.cpxfloat, ptr %0, i64 %21
  %23 = mul nsw i64 %indvars.iv, %19
  %24 = getelementptr inbounds %struct.cpxfloat, ptr %1, i64 %23
  tail call void @_Z5four1P8cpxfloatS0_iiii(ptr noundef %22, ptr noundef %24, i32 noundef %13, i32 noundef %3, i32 noundef %15, i32 noundef %17)
  %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 %20, !llvm.loop !15

._crit_edge:                                      ; preds = %20, %5
  ret void
}

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" }

!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, !7, i64 20}
!6 = !{!"_ZTS13bare_fft_plan", !7, i64 0, !7, i64 4, !7, i64 8, !7, i64 12, !7, i64 16, !7, i64 20}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!6, !7, i64 12}
!11 = !{!6, !7, i64 16}
!12 = !{!6, !7, i64 0}
!13 = !{!6, !7, i64 4}
!14 = !{!6, !7, i64 8}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}


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