; LLVM IR from FedericaPaoli1/stm32-speech-recognition-and-traduction :: Drivers/CMSIS/DSP/Source/BasicMathFunctions (arm_negate_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_negate_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
  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
  %9 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %9, ptr %7, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %25, %3
  %11 = load i32, ptr %7, align 4, !tbaa !9
  %12 = icmp ugt i32 %11, 0
  br i1 %12, label %13, label %32

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
  store i16 %16, ptr %8, align 2, !tbaa !11
  %17 = load i16, ptr %8, align 2, !tbaa !11
  %18 = sext i16 %17 to i32
  %19 = icmp eq i32 %18, -32768
  br i1 %19, label %20, label %21

20:                                               ; preds = %13
  br label %25

21:                                               ; preds = %13
  %22 = load i16, ptr %8, align 2, !tbaa !11
  %23 = sext i16 %22 to i32
  %24 = sub nsw i32 0, %23
  br label %25

25:                                               ; preds = %21, %20
  %26 = phi i32 [ 32767, %20 ], [ %24, %21 ]
  %27 = trunc i32 %26 to i16
  %28 = load ptr, ptr %5, align 8, !tbaa !5
  %29 = getelementptr inbounds i16, ptr %28, i32 1
  store ptr %29, ptr %5, align 8, !tbaa !5
  store i16 %27, ptr %28, align 2, !tbaa !11
  %30 = load i32, ptr %7, align 4, !tbaa !9
  %31 = add i32 %30, -1
  store i32 %31, ptr %7, align 4, !tbaa !9
  br label %10, !llvm.loop !13

32:                                               ; preds = %10
  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_negate_q15(ptr nocapture noundef readonly %0, ptr nocapture noundef writeonly %1, i32 noundef %2) local_unnamed_addr #0 {
  %.not8 = icmp eq i32 %2, 0
  br i1 %.not8, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %4 = ptrtoint ptr %1 to i64
  %5 = ptrtoint ptr %0 to i64
  %6 = zext i32 %2 to i64
  %min.iters.check = icmp ult i32 %2, 16
  %7 = sub i64 %4, %5
  %diff.check = icmp ult i64 %7, 32
  %or.cond = or i1 %min.iters.check, %diff.check
  br i1 %or.cond, label %.lr.ph.preheader21, label %vector.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %6, 4294967280
  %8 = shl nuw nsw i64 %n.vec, 1
  %ind.end = getelementptr i8, ptr %0, i64 %8
  %.cast = trunc nuw i64 %n.vec to i32
  %ind.end12 = sub i32 %2, %.cast
  %9 = shl nuw nsw i64 %n.vec, 1
  %ind.end14 = getelementptr i8, ptr %1, i64 %9
  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
  %offset.idx17 = shl i64 %index, 1
  %next.gep18 = getelementptr i8, ptr %1, i64 %offset.idx17
  %10 = getelementptr i8, ptr %next.gep, i64 16
  %wide.load = load <8 x i16>, ptr %next.gep, align 2, !tbaa !5
  %wide.load20 = load <8 x i16>, ptr %10, align 2, !tbaa !5
  %11 = icmp eq <8 x i16> %wide.load, <i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768>
  %12 = icmp eq <8 x i16> %wide.load20, <i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768, i16 -32768>
  %13 = sub <8 x i16> zeroinitializer, %wide.load
  %14 = sub <8 x i16> zeroinitializer, %wide.load20
  %15 = select <8 x i1> %11, <8 x i16> <i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767>, <8 x i16> %13
  %16 = select <8 x i1> %12, <8 x i16> <i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767, i16 32767>, <8 x i16> %14
  %17 = getelementptr i8, ptr %next.gep18, i64 16
  store <8 x i16> %15, ptr %next.gep18, align 2, !tbaa !5
  store <8 x i16> %16, ptr %17, align 2, !tbaa !5
  %index.next = add nuw i64 %index, 16
  %18 = icmp eq i64 %index.next, %n.vec
  br i1 %18, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %n.vec, %6
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader21

.lr.ph.preheader21:                               ; preds = %middle.block, %.lr.ph.preheader
  %.011.ph = phi ptr [ %0, %.lr.ph.preheader ], [ %ind.end, %middle.block ]
  %.0610.ph = phi i32 [ %2, %.lr.ph.preheader ], [ %ind.end12, %middle.block ]
  %.079.ph = phi ptr [ %1, %.lr.ph.preheader ], [ %ind.end14, %middle.block ]
  %19 = add i32 %.0610.ph, -1
  %xtraiter = and i32 %.0610.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.preheader21, %.lr.ph.prol
  %.011.prol = phi ptr [ %20, %.lr.ph.prol ], [ %.011.ph, %.lr.ph.preheader21 ]
  %.0610.prol = phi i32 [ %26, %.lr.ph.prol ], [ %.0610.ph, %.lr.ph.preheader21 ]
  %.079.prol = phi ptr [ %25, %.lr.ph.prol ], [ %.079.ph, %.lr.ph.preheader21 ]
  %prol.iter = phi i32 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader21 ]
  %20 = getelementptr inbounds i8, ptr %.011.prol, i64 2
  %21 = load i16, ptr %.011.prol, align 2, !tbaa !5
  %22 = icmp eq i16 %21, -32768
  %23 = sub i16 0, %21
  %24 = select i1 %22, i16 32767, i16 %23
  %25 = getelementptr inbounds i8, ptr %.079.prol, i64 2
  store i16 %24, ptr %.079.prol, align 2, !tbaa !5
  %26 = add i32 %.0610.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 !13

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader21
  %.011.unr = phi ptr [ %.011.ph, %.lr.ph.preheader21 ], [ %20, %.lr.ph.prol ]
  %.0610.unr = phi i32 [ %.0610.ph, %.lr.ph.preheader21 ], [ %26, %.lr.ph.prol ]
  %.079.unr = phi ptr [ %.079.ph, %.lr.ph.preheader21 ], [ %25, %.lr.ph.prol ]
  %27 = icmp ult i32 %19, 3
  br i1 %27, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %.011 = phi ptr [ %46, %.lr.ph ], [ %.011.unr, %.lr.ph.prol.loopexit ]
  %.0610 = phi i32 [ %52, %.lr.ph ], [ %.0610.unr, %.lr.ph.prol.loopexit ]
  %.079 = phi ptr [ %51, %.lr.ph ], [ %.079.unr, %.lr.ph.prol.loopexit ]
  %28 = getelementptr inbounds i8, ptr %.011, i64 2
  %29 = load i16, ptr %.011, align 2, !tbaa !5
  %30 = icmp eq i16 %29, -32768
  %31 = sub i16 0, %29
  %32 = select i1 %30, i16 32767, i16 %31
  %33 = getelementptr inbounds i8, ptr %.079, i64 2
  store i16 %32, ptr %.079, align 2, !tbaa !5
  %34 = getelementptr inbounds i8, ptr %.011, i64 4
  %35 = load i16, ptr %28, align 2, !tbaa !5
  %36 = icmp eq i16 %35, -32768
  %37 = sub i16 0, %35
  %38 = select i1 %36, i16 32767, i16 %37
  %39 = getelementptr inbounds i8, ptr %.079, i64 4
  store i16 %38, ptr %33, align 2, !tbaa !5
  %40 = getelementptr inbounds i8, ptr %.011, i64 6
  %41 = load i16, ptr %34, align 2, !tbaa !5
  %42 = icmp eq i16 %41, -32768
  %43 = sub i16 0, %41
  %44 = select i1 %42, i16 32767, i16 %43
  %45 = getelementptr inbounds i8, ptr %.079, i64 6
  store i16 %44, ptr %39, align 2, !tbaa !5
  %46 = getelementptr inbounds i8, ptr %.011, i64 8
  %47 = load i16, ptr %40, align 2, !tbaa !5
  %48 = icmp eq i16 %47, -32768
  %49 = sub i16 0, %47
  %50 = select i1 %48, i16 32767, i16 %49
  %51 = getelementptr inbounds i8, ptr %.079, i64 8
  store i16 %50, ptr %45, align 2, !tbaa !5
  %52 = add i32 %.0610, -4
  %.not.3 = icmp eq i32 %52, 0
  br i1 %.not.3, label %._crit_edge, label %.lr.ph, !llvm.loop !15

._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, !14}
!14 = !{!"llvm.loop.unroll.disable"}
!15 = distinct !{!15, !10, !11}


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