; LLVM IR from tensorflow/tflite-micro :: signal/src/fft_auto_scale.ll (ZN6tflite11tflm_signal12FftAutoScaleEPKsiPs)

; 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 i32 @_ZN6tflite11tflm_signal12FftAutoScaleEPKsiPs(ptr noundef %0, i32 noundef %1, ptr noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i16, align 2
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store ptr %2, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 2, ptr %7) #3
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = load i32, ptr %5, align 4, !tbaa !9
  %12 = call noundef signext i16 @_ZN6tflite11tflm_signal8MaxAbs16EPKsi(ptr noundef %10, i32 noundef %11)
  store i16 %12, ptr %7, align 2, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  %13 = load i16, ptr %7, align 2, !tbaa !11
  %14 = sext i16 %13 to i32
  %15 = call noundef i32 @_ZN6tflite11tflm_signal20MostSignificantBit32Ej(i32 noundef %14)
  %16 = zext i32 %15 to i64
  %17 = sub i64 16, %16
  %18 = sub i64 %17, 1
  %19 = trunc i64 %18 to i32
  store i32 %19, ptr %8, align 4, !tbaa !9
  %20 = load i32, ptr %8, align 4, !tbaa !9
  %21 = icmp sle i32 %20, 0
  br i1 %21, label %22, label %23

22:                                               ; preds = %3
  store i32 0, ptr %8, align 4, !tbaa !9
  br label %23

23:                                               ; preds = %22, %3
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  store i32 0, ptr %9, align 4, !tbaa !9
  br label %24

24:                                               ; preds = %44, %23
  %25 = load i32, ptr %9, align 4, !tbaa !9
  %26 = load i32, ptr %5, align 4, !tbaa !9
  %27 = icmp slt i32 %25, %26
  br i1 %27, label %29, label %28

28:                                               ; preds = %24
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  br label %47

29:                                               ; preds = %24
  %30 = load ptr, ptr %4, align 8, !tbaa !5
  %31 = load i32, ptr %9, align 4, !tbaa !9
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds i16, ptr %30, i64 %32
  %34 = load i16, ptr %33, align 2, !tbaa !11
  %35 = sext i16 %34 to i32
  %36 = load i32, ptr %8, align 4, !tbaa !9
  %37 = shl i32 1, %36
  %38 = mul nsw i32 %35, %37
  %39 = trunc i32 %38 to i16
  %40 = load ptr, ptr %6, align 8, !tbaa !5
  %41 = load i32, ptr %9, align 4, !tbaa !9
  %42 = sext i32 %41 to i64
  %43 = getelementptr inbounds i16, ptr %40, i64 %42
  store i16 %39, ptr %43, align 2, !tbaa !11
  br label %44

44:                                               ; preds = %29
  %45 = load i32, ptr %9, align 4, !tbaa !9
  %46 = add nsw i32 %45, 1
  store i32 %46, ptr %9, align 4, !tbaa !9
  br label %24, !llvm.loop !13

47:                                               ; preds = %28
  %48 = load i32, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 2, ptr %7) #3
  ret i32 %48
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare noundef signext i16 @_ZN6tflite11tflm_signal8MaxAbs16EPKsi(ptr noundef, i32 noundef) #2

declare noundef i32 @_ZN6tflite11tflm_signal20MostSignificantBit32Ej(i32 noundef) #2

; 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 = { "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 #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 = !{!12, !12, i64 0}
!12 = !{!"short", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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 uwtable
define dso_local noundef i32 @_ZN6tflite11tflm_signal12FftAutoScaleEPKsiPs(ptr noundef %0, i32 noundef %1, ptr nocapture noundef writeonly %2) local_unnamed_addr #0 {
  %4 = tail call noundef signext i16 @_ZN6tflite11tflm_signal8MaxAbs16EPKsi(ptr noundef %0, i32 noundef %1)
  %5 = sext i16 %4 to i32
  %6 = tail call noundef i32 @_ZN6tflite11tflm_signal20MostSignificantBit32Ej(i32 noundef %5)
  %7 = sub i32 15, %6
  %spec.store.select = tail call i32 @llvm.smax.i32(i32 %7, i32 0)
  %8 = icmp sgt i32 %1, 0
  br i1 %8, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %3
  %9 = ptrtoint ptr %2 to i64
  %10 = ptrtoint ptr %0 to i64
  %wide.trip.count = zext nneg i32 %1 to i64
  %min.iters.check = icmp ult i32 %1, 16
  %11 = sub i64 %9, %10
  %diff.check = icmp ult i64 %11, 32
  %or.cond = or i1 %min.iters.check, %diff.check
  br i1 %or.cond, label %.lr.ph.preheader15, label %vector.ph

.lr.ph.preheader15:                               ; preds = %middle.block, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  %xtraiter = and i64 %wide.trip.count, 3
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol

.lr.ph.prol:                                      ; preds = %.lr.ph.preheader15, %.lr.ph.prol
  %indvars.iv.prol = phi i64 [ %indvars.iv.next.prol, %.lr.ph.prol ], [ %indvars.iv.ph, %.lr.ph.preheader15 ]
  %prol.iter = phi i64 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader15 ]
  %12 = getelementptr inbounds i16, ptr %0, i64 %indvars.iv.prol
  %13 = load i16, ptr %12, align 2, !tbaa !5
  %14 = zext i16 %13 to i32
  %15 = shl i32 %14, %spec.store.select
  %16 = trunc i32 %15 to i16
  %17 = getelementptr inbounds i16, ptr %2, i64 %indvars.iv.prol
  store i16 %16, ptr %17, align 2, !tbaa !5
  %indvars.iv.next.prol = add nuw nsw i64 %indvars.iv.prol, 1
  %prol.iter.next = add i64 %prol.iter, 1
  %prol.iter.cmp.not = icmp eq i64 %prol.iter.next, %xtraiter
  br i1 %prol.iter.cmp.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol, !llvm.loop !9

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader15
  %indvars.iv.unr = phi i64 [ %indvars.iv.ph, %.lr.ph.preheader15 ], [ %indvars.iv.next.prol, %.lr.ph.prol ]
  %18 = sub nsw i64 %indvars.iv.ph, %wide.trip.count
  %19 = icmp ugt i64 %18, -4
  br i1 %19, label %._crit_edge, label %.lr.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %wide.trip.count, 2147483632
  %broadcast.splatinsert = insertelement <8 x i32> poison, i32 %spec.store.select, i64 0
  %broadcast.splat = shufflevector <8 x i32> %broadcast.splatinsert, <8 x i32> poison, <8 x i32> zeroinitializer
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %20 = getelementptr inbounds i16, ptr %0, i64 %index
  %21 = getelementptr inbounds i8, ptr %20, i64 16
  %wide.load = load <8 x i16>, ptr %20, align 2, !tbaa !5
  %wide.load14 = load <8 x i16>, ptr %21, align 2, !tbaa !5
  %22 = zext <8 x i16> %wide.load to <8 x i32>
  %23 = zext <8 x i16> %wide.load14 to <8 x i32>
  %24 = shl <8 x i32> %22, %broadcast.splat
  %25 = shl <8 x i32> %23, %broadcast.splat
  %26 = trunc <8 x i32> %24 to <8 x i16>
  %27 = trunc <8 x i32> %25 to <8 x i16>
  %28 = getelementptr inbounds i16, ptr %2, i64 %index
  %29 = getelementptr inbounds i8, ptr %28, i64 16
  store <8 x i16> %26, ptr %28, align 2, !tbaa !5
  store <8 x i16> %27, ptr %29, align 2, !tbaa !5
  %index.next = add nuw i64 %index, 16
  %30 = icmp eq i64 %index.next, %n.vec
  br i1 %30, label %middle.block, label %vector.body, !llvm.loop !11

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader15

._crit_edge:                                      ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %middle.block, %3
  ret i32 %spec.store.select

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next.3, %.lr.ph ], [ %indvars.iv.unr, %.lr.ph.prol.loopexit ]
  %31 = getelementptr inbounds i16, ptr %0, i64 %indvars.iv
  %32 = load i16, ptr %31, align 2, !tbaa !5
  %33 = zext i16 %32 to i32
  %34 = shl i32 %33, %spec.store.select
  %35 = trunc i32 %34 to i16
  %36 = getelementptr inbounds i16, ptr %2, i64 %indvars.iv
  store i16 %35, ptr %36, align 2, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %37 = getelementptr inbounds i16, ptr %0, i64 %indvars.iv.next
  %38 = load i16, ptr %37, align 2, !tbaa !5
  %39 = zext i16 %38 to i32
  %40 = shl i32 %39, %spec.store.select
  %41 = trunc i32 %40 to i16
  %42 = getelementptr inbounds i16, ptr %2, i64 %indvars.iv.next
  store i16 %41, ptr %42, align 2, !tbaa !5
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %43 = getelementptr inbounds i16, ptr %0, i64 %indvars.iv.next.1
  %44 = load i16, ptr %43, align 2, !tbaa !5
  %45 = zext i16 %44 to i32
  %46 = shl i32 %45, %spec.store.select
  %47 = trunc i32 %46 to i16
  %48 = getelementptr inbounds i16, ptr %2, i64 %indvars.iv.next.1
  store i16 %47, ptr %48, align 2, !tbaa !5
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %49 = getelementptr inbounds i16, ptr %0, i64 %indvars.iv.next.2
  %50 = load i16, ptr %49, align 2, !tbaa !5
  %51 = zext i16 %50 to i32
  %52 = shl i32 %51, %spec.store.select
  %53 = trunc i32 %52 to i16
  %54 = getelementptr inbounds i16, ptr %2, i64 %indvars.iv.next.2
  store i16 %53, ptr %54, align 2, !tbaa !5
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %exitcond.not.3 = icmp eq i64 %indvars.iv.next.3, %wide.trip.count
  br i1 %exitcond.not.3, label %._crit_edge, label %.lr.ph, !llvm.loop !15
}

declare noundef signext i16 @_ZN6tflite11tflm_signal8MaxAbs16EPKsi(ptr noundef, i32 noundef) local_unnamed_addr #1

declare noundef i32 @_ZN6tflite11tflm_signal20MostSignificantBit32Ej(i32 noundef) local_unnamed_addr #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #2

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 = { "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 nosync nounwind speculatable willreturn memory(none) }

!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 = !{!"short", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.unroll.disable"}
!11 = distinct !{!11, !12, !13, !14}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!"llvm.loop.isvectorized", i32 1}
!14 = !{!"llvm.loop.unroll.runtime.disable"}
!15 = distinct !{!15, !12, !13}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopLoadEliminationPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,LoopVectorizePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass