; LLVM IR from FedericaPaoli1/stm32-speech-recognition-and-traduction :: Drivers/CMSIS/DSP/Source/ComplexMathFunctions (arm_cmplx_conj_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_conj_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 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 4, ptr %8) #2
  %9 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %9, ptr %7, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %29, %3
  %11 = load i32, ptr %7, align 4, !tbaa !9
  %12 = icmp ugt i32 %11, 0
  br i1 %12, label %13, label %36

13:                                               ; preds = %10
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = getelementptr inbounds i16, ptr %14, i32 1
  store ptr %15, ptr %4, align 8, !tbaa !5
  %16 = load i16, ptr %14, align 2, !tbaa !11
  %17 = load ptr, ptr %5, align 8, !tbaa !5
  %18 = getelementptr inbounds i16, ptr %17, i32 1
  store ptr %18, ptr %5, align 8, !tbaa !5
  store i16 %16, ptr %17, align 2, !tbaa !11
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  %20 = getelementptr inbounds i16, ptr %19, i32 1
  store ptr %20, ptr %4, align 8, !tbaa !5
  %21 = load i16, ptr %19, align 2, !tbaa !11
  %22 = sext i16 %21 to i32
  store i32 %22, ptr %8, align 4, !tbaa !9
  %23 = load i32, ptr %8, align 4, !tbaa !9
  %24 = icmp eq i32 %23, -32768
  br i1 %24, label %25, label %26

25:                                               ; preds = %13
  br label %29

26:                                               ; preds = %13
  %27 = load i32, ptr %8, align 4, !tbaa !9
  %28 = sub nsw i32 0, %27
  br label %29

29:                                               ; preds = %26, %25
  %30 = phi i32 [ 32767, %25 ], [ %28, %26 ]
  %31 = trunc i32 %30 to i16
  %32 = load ptr, ptr %5, align 8, !tbaa !5
  %33 = getelementptr inbounds i16, ptr %32, i32 1
  store ptr %33, ptr %5, align 8, !tbaa !5
  store i16 %31, ptr %32, align 2, !tbaa !11
  %34 = load i32, ptr %7, align 4, !tbaa !9
  %35 = add i32 %34, -1
  store i32 %35, ptr %7, align 4, !tbaa !9
  br label %10, !llvm.loop !13

36:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 4, 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_conj_q15(ptr nocapture noundef readonly %0, ptr nocapture noundef writeonly %1, i32 noundef %2) local_unnamed_addr #0 {
  %.not10 = icmp eq i32 %2, 0
  br i1 %.not10, 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, 8
  br i1 %min.iters.check, label %.lr.ph.preheader22, 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, 2
  %8 = add nuw nsw i64 %7, 4
  %scevgep = getelementptr i8, ptr %1, i64 %8
  %scevgep14 = getelementptr i8, ptr %0, i64 %8
  %bound0 = icmp ugt ptr %scevgep14, %1
  %bound1 = icmp ugt ptr %scevgep, %0
  %found.conflict = and i1 %bound0, %bound1
  br i1 %found.conflict, label %.lr.ph.preheader22, label %vector.ph

vector.ph:                                        ; preds = %vector.memcheck
  %n.vec = and i64 %4, 4294967292
  %9 = shl nuw nsw i64 %n.vec, 2
  %ind.end = getelementptr i8, ptr %0, i64 %9
  %.cast = trunc nuw i64 %n.vec to i32
  %ind.end15 = sub i32 %2, %.cast
  %10 = shl nuw nsw i64 %n.vec, 2
  %ind.end17 = getelementptr i8, ptr %1, i64 %10
  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.idx19 = shl i64 %index, 2
  %next.gep20 = getelementptr i8, ptr %1, i64 %offset.idx19
  %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.vec21 = shufflevector <8 x i16> %wide.vec, <8 x i16> poison, <4 x i32> <i32 1, i32 3, i32 5, i32 7>
  %11 = icmp eq <4 x i16> %strided.vec21, <i16 -32768, i16 -32768, i16 -32768, i16 -32768>
  %12 = sub <4 x i16> zeroinitializer, %strided.vec21
  %13 = select <4 x i1> %11, <4 x i16> <i16 32767, i16 32767, i16 32767, i16 32767>, <4 x i16> %12
  %interleaved.vec = shufflevector <4 x i16> %strided.vec, <4 x i16> %13, <8 x i32> <i32 0, i32 4, i32 1, i32 5, i32 2, i32 6, i32 3, i32 7>
  store <8 x i16> %interleaved.vec, ptr %next.gep20, align 2, !tbaa !5
  %index.next = add nuw i64 %index, 4
  %14 = icmp eq i64 %index.next, %n.vec
  br i1 %14, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %4
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader22

.lr.ph.preheader22:                               ; preds = %middle.block, %vector.memcheck, %.lr.ph.preheader
  %.013.ph = phi ptr [ %0, %vector.memcheck ], [ %0, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  %.0812.ph = phi i32 [ %2, %vector.memcheck ], [ %2, %.lr.ph.preheader ], [ %ind.end15, %middle.block ]
  %.0911.ph = phi ptr [ %1, %vector.memcheck ], [ %1, %.lr.ph.preheader ], [ %ind.end17, %middle.block ]
  %xtraiter = and i32 %.0812.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.preheader22
  %15 = getelementptr inbounds i8, ptr %.013.ph, i64 2
  %16 = load i16, ptr %.013.ph, align 2, !tbaa !5
  %17 = getelementptr inbounds i8, ptr %.0911.ph, i64 2
  store i16 %16, ptr %.0911.ph, align 2, !tbaa !5
  %18 = getelementptr inbounds i8, ptr %.013.ph, i64 4
  %19 = load i16, ptr %15, align 2, !tbaa !5
  %20 = icmp eq i16 %19, -32768
  %21 = sub i16 0, %19
  %22 = select i1 %20, i16 32767, i16 %21
  %23 = getelementptr inbounds i8, ptr %.0911.ph, i64 4
  store i16 %22, ptr %17, align 2, !tbaa !5
  %24 = add nsw i32 %.0812.ph, -1
  br label %.lr.ph.prol.loopexit

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader22
  %.013.unr = phi ptr [ %.013.ph, %.lr.ph.preheader22 ], [ %18, %.lr.ph.prol ]
  %.0812.unr = phi i32 [ %.0812.ph, %.lr.ph.preheader22 ], [ %24, %.lr.ph.prol ]
  %.0911.unr = phi ptr [ %.0911.ph, %.lr.ph.preheader22 ], [ %23, %.lr.ph.prol ]
  %25 = icmp eq i32 %.0812.ph, 1
  br i1 %25, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %.013 = phi ptr [ %38, %.lr.ph ], [ %.013.unr, %.lr.ph.prol.loopexit ]
  %.0812 = phi i32 [ %44, %.lr.ph ], [ %.0812.unr, %.lr.ph.prol.loopexit ]
  %.0911 = phi ptr [ %43, %.lr.ph ], [ %.0911.unr, %.lr.ph.prol.loopexit ]
  %26 = getelementptr inbounds i8, ptr %.013, i64 2
  %27 = load i16, ptr %.013, align 2, !tbaa !5
  %28 = getelementptr inbounds i8, ptr %.0911, i64 2
  store i16 %27, ptr %.0911, align 2, !tbaa !5
  %29 = getelementptr inbounds i8, ptr %.013, i64 4
  %30 = load i16, ptr %26, align 2, !tbaa !5
  %31 = icmp eq i16 %30, -32768
  %32 = sub i16 0, %30
  %33 = select i1 %31, i16 32767, i16 %32
  %34 = getelementptr inbounds i8, ptr %.0911, i64 4
  store i16 %33, ptr %28, align 2, !tbaa !5
  %35 = getelementptr inbounds i8, ptr %.013, i64 6
  %36 = load i16, ptr %29, align 2, !tbaa !5
  %37 = getelementptr inbounds i8, ptr %.0911, i64 6
  store i16 %36, ptr %34, align 2, !tbaa !5
  %38 = getelementptr inbounds i8, ptr %.013, i64 8
  %39 = load i16, ptr %35, align 2, !tbaa !5
  %40 = icmp eq i16 %39, -32768
  %41 = sub i16 0, %39
  %42 = select i1 %40, i16 32767, i16 %41
  %43 = getelementptr inbounds i8, ptr %.0911, i64 8
  store i16 %42, ptr %37, align 2, !tbaa !5
  %44 = add i32 %.0812, -2
  %.not.1 = icmp eq i32 %44, 0
  br i1 %.not.1, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._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 = distinct !{!9, !10, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !11}


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