; LLVM IR from FedericaPaoli1/stm32-speech-recognition-and-traduction :: Drivers/CMSIS/DSP/Source/SupportFunctions (arm_q15_to_q7)

; 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_q15_to_q7(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 ptr, align 8
  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 8, ptr %8) #2
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %9, ptr %8, align 8, !tbaa !5
  %10 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %10, ptr %7, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %14, %3
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = icmp ugt i32 %12, 0
  br i1 %13, label %14, label %25

14:                                               ; preds = %11
  %15 = load ptr, ptr %8, align 8, !tbaa !5
  %16 = getelementptr inbounds i16, ptr %15, i32 1
  store ptr %16, ptr %8, align 8, !tbaa !5
  %17 = load i16, ptr %15, align 2, !tbaa !11
  %18 = sext i16 %17 to i32
  %19 = ashr i32 %18, 8
  %20 = trunc i32 %19 to i8
  %21 = load ptr, ptr %5, align 8, !tbaa !5
  %22 = getelementptr inbounds i8, ptr %21, i32 1
  store ptr %22, ptr %5, align 8, !tbaa !5
  store i8 %20, ptr %21, align 1, !tbaa !13
  %23 = load i32, ptr %7, align 4, !tbaa !9
  %24 = add i32 %23, -1
  store i32 %24, ptr %7, align 4, !tbaa !9
  br label %11, !llvm.loop !14

25:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 8, 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 = !{!7, !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"

; Function Attrs: nofree norecurse nosync nounwind memory(readwrite, inaccessiblemem: none) uwtable
define dso_local void @arm_q15_to_q7(ptr nocapture noundef readonly %0, ptr nocapture noundef writeonly %1, i32 noundef %2) local_unnamed_addr #0 {
  %.not7 = icmp eq i32 %2, 0
  br i1 %.not7, 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, 16
  br i1 %min.iters.check, label %.lr.ph.preheader20, label %vector.memcheck

vector.memcheck:                                  ; preds = %.lr.ph.preheader
  %5 = add i32 %2, -1
  %6 = zext i32 %5 to i64
  %7 = zext i32 %2 to i64
  %scevgep = getelementptr i8, ptr %1, i64 %7
  %8 = shl nuw nsw i64 %6, 1
  %9 = getelementptr i8, ptr %0, i64 %8
  %scevgep11 = getelementptr i8, ptr %9, i64 2
  %bound0 = icmp ugt ptr %scevgep11, %1
  %bound1 = icmp ugt ptr %scevgep, %0
  %found.conflict = and i1 %bound0, %bound1
  br i1 %found.conflict, label %.lr.ph.preheader20, label %vector.ph

vector.ph:                                        ; preds = %vector.memcheck
  %n.vec = and i64 %4, 4294967280
  %10 = shl nuw nsw i64 %n.vec, 1
  %ind.end = getelementptr i8, ptr %0, i64 %10
  %.cast = trunc nuw i64 %n.vec to i32
  %ind.end12 = sub i32 %2, %.cast
  %ind.end14 = getelementptr i8, ptr %1, i64 %n.vec
  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, 1
  %next.gep = getelementptr i8, ptr %0, i64 %offset.idx
  %next.gep17 = getelementptr i8, ptr %1, i64 %index
  %11 = getelementptr i8, ptr %next.gep, i64 16
  %wide.load = load <8 x i16>, ptr %next.gep, align 2, !tbaa !5, !alias.scope !9
  %wide.load19 = load <8 x i16>, ptr %11, align 2, !tbaa !5, !alias.scope !9
  %12 = lshr <8 x i16> %wide.load, <i16 8, i16 8, i16 8, i16 8, i16 8, i16 8, i16 8, i16 8>
  %13 = lshr <8 x i16> %wide.load19, <i16 8, i16 8, i16 8, i16 8, i16 8, i16 8, i16 8, i16 8>
  %14 = trunc nuw <8 x i16> %12 to <8 x i8>
  %15 = trunc nuw <8 x i16> %13 to <8 x i8>
  %16 = getelementptr i8, ptr %next.gep17, i64 8
  store <8 x i8> %14, ptr %next.gep17, align 1, !tbaa !12, !alias.scope !13, !noalias !9
  store <8 x i8> %15, ptr %16, align 1, !tbaa !12, !alias.scope !13, !noalias !9
  %index.next = add nuw i64 %index, 16
  %17 = icmp eq i64 %index.next, %n.vec
  br i1 %17, label %middle.block, label %vector.body, !llvm.loop !15

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %4
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader20

.lr.ph.preheader20:                               ; preds = %middle.block, %vector.memcheck, %.lr.ph.preheader
  %.010.ph = phi ptr [ %0, %vector.memcheck ], [ %0, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  %.059.ph = phi i32 [ %2, %vector.memcheck ], [ %2, %.lr.ph.preheader ], [ %ind.end12, %middle.block ]
  %.068.ph = phi ptr [ %1, %vector.memcheck ], [ %1, %.lr.ph.preheader ], [ %ind.end14, %middle.block ]
  %18 = add i32 %.059.ph, -1
  %xtraiter = and i32 %.059.ph, 3
  %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.preheader20, %.lr.ph.prol
  %.010.prol = phi ptr [ %19, %.lr.ph.prol ], [ %.010.ph, %.lr.ph.preheader20 ]
  %.059.prol = phi i32 [ %24, %.lr.ph.prol ], [ %.059.ph, %.lr.ph.preheader20 ]
  %.068.prol = phi ptr [ %23, %.lr.ph.prol ], [ %.068.ph, %.lr.ph.preheader20 ]
  %prol.iter = phi i32 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader20 ]
  %19 = getelementptr inbounds i8, ptr %.010.prol, i64 2
  %20 = load i16, ptr %.010.prol, align 2, !tbaa !5
  %21 = lshr i16 %20, 8
  %22 = trunc nuw i16 %21 to i8
  %23 = getelementptr inbounds i8, ptr %.068.prol, i64 1
  store i8 %22, ptr %.068.prol, align 1, !tbaa !12
  %24 = add i32 %.059.prol, -1
  %prol.iter.next = add i32 %prol.iter, 1
  %prol.iter.cmp.not = icmp eq i32 %prol.iter.next, %xtraiter
  br i1 %prol.iter.cmp.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol, !llvm.loop !19

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader20
  %.010.unr = phi ptr [ %.010.ph, %.lr.ph.preheader20 ], [ %19, %.lr.ph.prol ]
  %.059.unr = phi i32 [ %.059.ph, %.lr.ph.preheader20 ], [ %24, %.lr.ph.prol ]
  %.068.unr = phi ptr [ %.068.ph, %.lr.ph.preheader20 ], [ %23, %.lr.ph.prol ]
  %25 = icmp ult i32 %18, 3
  br i1 %25, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %.010 = phi ptr [ %41, %.lr.ph ], [ %.010.unr, %.lr.ph.prol.loopexit ]
  %.059 = phi i32 [ %46, %.lr.ph ], [ %.059.unr, %.lr.ph.prol.loopexit ]
  %.068 = phi ptr [ %45, %.lr.ph ], [ %.068.unr, %.lr.ph.prol.loopexit ]
  %26 = getelementptr inbounds i8, ptr %.010, i64 2
  %27 = load i16, ptr %.010, align 2, !tbaa !5
  %28 = lshr i16 %27, 8
  %29 = trunc nuw i16 %28 to i8
  %30 = getelementptr inbounds i8, ptr %.068, i64 1
  store i8 %29, ptr %.068, align 1, !tbaa !12
  %31 = getelementptr inbounds i8, ptr %.010, i64 4
  %32 = load i16, ptr %26, align 2, !tbaa !5
  %33 = lshr i16 %32, 8
  %34 = trunc nuw i16 %33 to i8
  %35 = getelementptr inbounds i8, ptr %.068, i64 2
  store i8 %34, ptr %30, align 1, !tbaa !12
  %36 = getelementptr inbounds i8, ptr %.010, i64 6
  %37 = load i16, ptr %31, align 2, !tbaa !5
  %38 = lshr i16 %37, 8
  %39 = trunc nuw i16 %38 to i8
  %40 = getelementptr inbounds i8, ptr %.068, i64 3
  store i8 %39, ptr %35, align 1, !tbaa !12
  %41 = getelementptr inbounds i8, ptr %.010, i64 8
  %42 = load i16, ptr %36, align 2, !tbaa !5
  %43 = lshr i16 %42, 8
  %44 = trunc nuw i16 %43 to i8
  %45 = getelementptr inbounds i8, ptr %.068, i64 4
  store i8 %44, ptr %40, align 1, !tbaa !12
  %46 = add i32 %.059, -4
  %.not.3 = icmp eq i32 %46, 0
  br i1 %.not.3, label %._crit_edge, label %.lr.ph, !llvm.loop !21

._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 = !{!7, !7, i64 0}
!13 = !{!14}
!14 = distinct !{!14, !11}
!15 = distinct !{!15, !16, !17, !18}
!16 = !{!"llvm.loop.mustprogress"}
!17 = !{!"llvm.loop.isvectorized", i32 1}
!18 = !{!"llvm.loop.unroll.runtime.disable"}
!19 = distinct !{!19, !20}
!20 = !{!"llvm.loop.unroll.disable"}
!21 = distinct !{!21, !16, !17}


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