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Mon, 23 Mar 2026 12:22:07 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Taylor Simpson Date: Mon, 23 Mar 2026 13:21:55 -0600 X-Gm-Features: AaiRm51-lP7SsdXbTPo2ZojHZBHMHKGzP14guUgu8NAzGb76G-RrdOutMVA0ZbE Message-ID: Subject: Re: [PATCH 02/13] target/hexagon: fix incorrect/too-permissive HVX encodings To: Matheus Tavares Bernardino Cc: qemu-devel@nongnu.org, brian.cain@oss.qualcomm.com, ale@rev.ng, anjo@rev.ng, marco.liebel@oss.qualcomm.com, philmd@linaro.org, quic_mburton@quicinc.com, sid.manning@oss.qualcomm.com Content-Type: multipart/alternative; boundary="00000000000056840d064db5f32c" Received-SPF: pass client-ip=2607:f8b0:4864:20::430; envelope-from=ltaylorsimpson@gmail.com; helo=mail-pf1-x430.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --00000000000056840d064db5f32c Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, Mar 23, 2026 at 7:15=E2=80=AFAM Matheus Tavares Bernardino < matheus.bernardino@oss.qualcomm.com> wrote: > The following encodings have become stricter since v68: > > - V6_vunpackob, V6_vunpackoh: ---00 -> --000 > - V6_vaddbq/hq/wq, V6_vaddbnq/hnq/wnq: ---01 -> --001 > - V6_vsubbq/hq, V6_vsubwq/bnq/hnq/wnq: ---01/---10 -> --001/--010 > - V6_vhist, V6_vwhist128/256, V6_vwhist128/256_sat: ---00 -> --000 > - V6_vhistq, V6_vwhist128/256q, V6_vwhist128/256q_sat: ---10 -> --010 > > Pre v68 compilers, by default, already use "0" for the non-specified bit > that changed in v68, so unless someone is manually writing the binary > encoding, this should not cause any backwards incompatibility with > pre-v68 binaries. > > Signed-off-by: Matheus Tavares Bernardino < > matheus.bernardino@oss.qualcomm.com> > --- > target/hexagon/imported/mmvec/encode_ext.def | 48 ++++++++++---------- > 1 file changed, 24 insertions(+), 24 deletions(-) > Reviewed-by: Taylor Simpson --00000000000056840d064db5f32c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Mon, Mar 23,= 2026 at 7:15=E2=80=AFAM Matheus Tavares Bernardino <matheus.bernardino@oss.qualcomm.com= > wrote:
The = following encodings have become stricter since v68:

=C2=A0 =C2=A0 - V6_vunpackob, V6_vunpackoh: ---00 -> --000
=C2=A0 =C2=A0 - V6_vaddbq/hq/wq, V6_vaddbnq/hnq/wnq: ---01 -> --001
=C2=A0 =C2=A0 - V6_vsubbq/hq, V6_vsubwq/bnq/hnq/wnq: ---01/---10 -> --00= 1/--010
=C2=A0 =C2=A0 - V6_vhist, V6_vwhist128/256, V6_vwhist128/256_sat: ---00 -&g= t; --000
=C2=A0 =C2=A0 - V6_vhistq, V6_vwhist128/256q, V6_vwhist128/256q_sat: ---10 = -> --010

Pre v68 compilers, by default, already use "0" for the non-specif= ied bit
that changed in v68, so unless someone is manually writing the binary
encoding, this should not cause any backwards incompatibility with
pre-v68 binaries.

Signed-off-by: Matheus Tavares Bernardino <matheus.bernardino@oss.qualcomm= .com>
---
=C2=A0target/hexagon/imported/mmvec/encode_ext.def | 48 ++++++++++---------= -
=C2=A01 file changed, 24 insertions(+), 24 deletions(-)

Reviewed-by: Taylor Simpson <ltaylorsimpson@gmail.com>
=C2=A0
--00000000000056840d064db5f32c--