; LLVM IR from FedericaPaoli1/stm32-speech-recognition-and-traduction :: Drivers/CMSIS/DSP/Source/ComplexMathFunctions (arm_cmplx_mag_squared_q15)

; 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: nounwind uwtable
define dso_local void @arm_cmplx_mag_squared_q15(ptr noundef %0, ptr noundef %1, i32 noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i16, align 2
  %9 = alloca i16, align 2
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.start.p0(i64 2, ptr %8) #2
  call void @llvm.lifetime.start.p0(i64 2, ptr %9) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #2
  %12 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %12, ptr %7, align 4, !tbaa !9
  br label %13

13:                                               ; preds = %16, %3
  %14 = load i32, ptr %7, align 4, !tbaa !9
  %15 = icmp ugt i32 %14, 0
  br i1 %15, label %16, label %44

16:                                               ; preds = %13
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = getelementptr inbounds i16, ptr %17, i32 1
  store ptr %18, ptr %4, align 8, !tbaa !5
  %19 = load i16, ptr %17, align 2, !tbaa !11
  store i16 %19, ptr %8, align 2, !tbaa !11
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  %21 = getelementptr inbounds i16, ptr %20, i32 1
  store ptr %21, ptr %4, align 8, !tbaa !5
  %22 = load i16, ptr %20, align 2, !tbaa !11
  store i16 %22, ptr %9, align 2, !tbaa !11
  %23 = load i16, ptr %8, align 2, !tbaa !11
  %24 = sext i16 %23 to i32
  %25 = load i16, ptr %8, align 2, !tbaa !11
  %26 = sext i16 %25 to i32
  %27 = mul nsw i32 %24, %26
  store i32 %27, ptr %10, align 4, !tbaa !9
  %28 = load i16, ptr %9, align 2, !tbaa !11
  %29 = sext i16 %28 to i32
  %30 = load i16, ptr %9, align 2, !tbaa !11
  %31 = sext i16 %30 to i32
  %32 = mul nsw i32 %29, %31
  store i32 %32, ptr %11, align 4, !tbaa !9
  %33 = load i32, ptr %10, align 4, !tbaa !9
  %34 = sext i32 %33 to i64
  %35 = load i32, ptr %11, align 4, !tbaa !9
  %36 = sext i32 %35 to i64
  %37 = add nsw i64 %34, %36
  %38 = ashr i64 %37, 17
  %39 = trunc i64 %38 to i16
  %40 = load ptr, ptr %5, align 8, !tbaa !5
  %41 = getelementptr inbounds i16, ptr %40, i32 1
  store ptr %41, ptr %5, align 8, !tbaa !5
  store i16 %39, ptr %40, align 2, !tbaa !11
  %42 = load i32, ptr %7, align 4, !tbaa !9
  %43 = add i32 %42, -1
  store i32 %43, ptr %7, align 4, !tbaa !9
  br label %13, !llvm.loop !13

44:                                               ; preds = %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  call void @llvm.lifetime.end.p0(i64 2, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 2, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret void
}

; 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 = { 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/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: nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @arm_cmplx_mag_squared_q15(ptr nocapture noundef readonly %0, ptr nocapture noundef writeonly %1, i32 noundef %2) local_unnamed_addr #0 {
  %.not13 = icmp eq i32 %2, 0
  br i1 %.not13, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %4 = zext i32 %2 to i64
  %min.iters.check = icmp ult i32 %2, 12
  br i1 %min.iters.check, label %.lr.ph.preheader25, label %vector.memcheck

vector.memcheck:                                  ; preds = %.lr.ph.preheader
  %5 = add i32 %2, -1
  %6 = zext i32 %5 to i64
  %7 = shl nuw nsw i64 %6, 1
  %8 = getelementptr i8, ptr %1, i64 %7
  %scevgep = getelementptr i8, ptr %8, i64 2
  %9 = shl nuw nsw i64 %6, 2
  %10 = getelementptr i8, ptr %0, i64 %9
  %scevgep17 = getelementptr i8, ptr %10, i64 4
  %bound0 = icmp ugt ptr %scevgep17, %1
  %bound1 = icmp ugt ptr %scevgep, %0
  %found.conflict = and i1 %bound0, %bound1
  br i1 %found.conflict, label %.lr.ph.preheader25, label %vector.ph

vector.ph:                                        ; preds = %vector.memcheck
  %n.vec = and i64 %4, 4294967292
  %11 = shl nuw nsw i64 %n.vec, 2
  %ind.end = getelementptr i8, ptr %0, i64 %11
  %12 = shl nuw nsw i64 %n.vec, 1
  %ind.end18 = getelementptr i8, ptr %1, i64 %12
  %.cast = trunc nuw i64 %n.vec to i32
  %ind.end20 = sub i32 %2, %.cast
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %offset.idx = shl i64 %index, 2
  %next.gep = getelementptr i8, ptr %0, i64 %offset.idx
  %offset.idx22 = shl i64 %index, 1
  %next.gep23 = getelementptr i8, ptr %1, i64 %offset.idx22
  %wide.vec = load <8 x i16>, ptr %next.gep, align 2, !tbaa !5
  %strided.vec = shufflevector <8 x i16> %wide.vec, <8 x i16> poison, <4 x i32> <i32 0, i32 2, i32 4, i32 6>
  %strided.vec24 = shufflevector <8 x i16> %wide.vec, <8 x i16> poison, <4 x i32> <i32 1, i32 3, i32 5, i32 7>
  %13 = sext <4 x i16> %strided.vec to <4 x i32>
  %14 = mul nsw <4 x i32> %13, %13
  %15 = sext <4 x i16> %strided.vec24 to <4 x i32>
  %16 = mul nsw <4 x i32> %15, %15
  %17 = add nuw <4 x i32> %16, %14
  %18 = lshr <4 x i32> %17, <i32 17, i32 17, i32 17, i32 17>
  %19 = trunc nuw nsw <4 x i32> %18 to <4 x i16>
  store <4 x i16> %19, ptr %next.gep23, align 2, !tbaa !5, !alias.scope !9, !noalias !12
  %index.next = add nuw i64 %index, 4
  %20 = icmp eq i64 %index.next, %n.vec
  br i1 %20, label %middle.block, label %vector.body, !llvm.loop !14

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %4
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader25

.lr.ph.preheader25:                               ; preds = %middle.block, %vector.memcheck, %.lr.ph.preheader
  %.016.ph = phi ptr [ %0, %vector.memcheck ], [ %0, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  %.01115.ph = phi ptr [ %1, %vector.memcheck ], [ %1, %.lr.ph.preheader ], [ %ind.end18, %middle.block ]
  %.01214.ph = phi i32 [ %2, %vector.memcheck ], [ %2, %.lr.ph.preheader ], [ %ind.end20, %middle.block ]
  %xtraiter = and i32 %.01214.ph, 1
  %lcmp.mod.not = icmp eq i32 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol

.lr.ph.prol:                                      ; preds = %.lr.ph.preheader25
  %21 = getelementptr inbounds i8, ptr %.016.ph, i64 2
  %22 = load i16, ptr %.016.ph, align 2, !tbaa !5
  %23 = getelementptr inbounds i8, ptr %.016.ph, i64 4
  %24 = load i16, ptr %21, align 2, !tbaa !5
  %25 = sext i16 %22 to i32
  %26 = mul nsw i32 %25, %25
  %27 = sext i16 %24 to i32
  %28 = mul nsw i32 %27, %27
  %narrow.prol = add nuw i32 %28, %26
  %29 = lshr i32 %narrow.prol, 17
  %30 = trunc nuw nsw i32 %29 to i16
  %31 = getelementptr inbounds i8, ptr %.01115.ph, i64 2
  store i16 %30, ptr %.01115.ph, align 2, !tbaa !5
  %32 = add nsw i32 %.01214.ph, -1
  br label %.lr.ph.prol.loopexit

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader25
  %.016.unr = phi ptr [ %.016.ph, %.lr.ph.preheader25 ], [ %23, %.lr.ph.prol ]
  %.01115.unr = phi ptr [ %.01115.ph, %.lr.ph.preheader25 ], [ %31, %.lr.ph.prol ]
  %.01214.unr = phi i32 [ %.01214.ph, %.lr.ph.preheader25 ], [ %32, %.lr.ph.prol ]
  %33 = icmp eq i32 %.01214.ph, 1
  br i1 %33, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %.016 = phi ptr [ %47, %.lr.ph ], [ %.016.unr, %.lr.ph.prol.loopexit ]
  %.01115 = phi ptr [ %55, %.lr.ph ], [ %.01115.unr, %.lr.ph.prol.loopexit ]
  %.01214 = phi i32 [ %56, %.lr.ph ], [ %.01214.unr, %.lr.ph.prol.loopexit ]
  %34 = getelementptr inbounds i8, ptr %.016, i64 2
  %35 = load i16, ptr %.016, align 2, !tbaa !5
  %36 = getelementptr inbounds i8, ptr %.016, i64 4
  %37 = load i16, ptr %34, align 2, !tbaa !5
  %38 = sext i16 %35 to i32
  %39 = mul nsw i32 %38, %38
  %40 = sext i16 %37 to i32
  %41 = mul nsw i32 %40, %40
  %narrow = add nuw i32 %41, %39
  %42 = lshr i32 %narrow, 17
  %43 = trunc nuw nsw i32 %42 to i16
  %44 = getelementptr inbounds i8, ptr %.01115, i64 2
  store i16 %43, ptr %.01115, align 2, !tbaa !5
  %45 = getelementptr inbounds i8, ptr %.016, i64 6
  %46 = load i16, ptr %36, align 2, !tbaa !5
  %47 = getelementptr inbounds i8, ptr %.016, i64 8
  %48 = load i16, ptr %45, align 2, !tbaa !5
  %49 = sext i16 %46 to i32
  %50 = mul nsw i32 %49, %49
  %51 = sext i16 %48 to i32
  %52 = mul nsw i32 %51, %51
  %narrow.1 = add nuw i32 %52, %50
  %53 = lshr i32 %narrow.1, 17
  %54 = trunc nuw nsw i32 %53 to i16
  %55 = getelementptr inbounds i8, ptr %.01115, i64 4
  store i16 %54, ptr %44, align 2, !tbaa !5
  %56 = add i32 %.01214, -2
  %.not.1 = icmp eq i32 %56, 0
  br i1 %.not.1, label %._crit_edge, label %.lr.ph, !llvm.loop !18

._crit_edge:                                      ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %middle.block, %3
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: 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 = !{!6, !6, i64 0}
!6 = !{!"short", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10}
!10 = distinct !{!10, !11}
!11 = distinct !{!11, !"LVerDomain"}
!12 = !{!13}
!13 = distinct !{!13, !11}
!14 = distinct !{!14, !15, !16, !17}
!15 = !{!"llvm.loop.mustprogress"}
!16 = !{!"llvm.loop.isvectorized", i32 1}
!17 = !{!"llvm.loop.unroll.runtime.disable"}
!18 = distinct !{!18, !15, !16}


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