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Mon, 18 May 2026 10:12:44 -0700 (PDT) Date: Tue, 19 May 2026 01:12:40 +0800 From: Kuan-Wei Chiu To: Andreas Schwab Cc: geert@linux-m68k.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, memxor@gmail.com, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, jserv@ccns.ncku.edu.tw, eleanor15x@gmail.com, marscheng@google.com, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, bpf@vger.kernel.org, Daniel Palmer Subject: Re: [PATCH bpf-next v3] m68k, bpf: Add initial BPF JIT compiler support Message-ID: References: <20260511212756.3163955-1-visitorckw@gmail.com> <87h5oc4jpf.fsf@igel.home> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87h5oc4jpf.fsf@igel.home> Hi Andreas, On Tue, May 12, 2026 at 07:32:44PM +0200, Andreas Schwab wrote: > On Mai 11 2026, Kuan-Wei Chiu wrote: > > > + > > + emit_16(ctx, 0x4a80 | d_lo); /* tst.l d_lo */ > > + emit_16(ctx, 0x6b04); /* bmi.s .+6 */ > > + emit_16(ctx, 0x7000 | (d_hi << 9)); /* moveq #0, d_hi */ > > + emit_16(ctx, 0x6002); /* bra.s .+4 */ > > + emit_16(ctx, 0x70ff | (d_hi << 9)); /* moveq #-1, d_hi */ > > I think this could be "tst.l d_lo; smi d_hi; extb.l d_hi". > Sorry for the late reply, and thanks for the review. This makes sense. I initially kept things simple to focus on correctness first, but since you pointed it out, I will include this optimization in the next respin. Thanks! Regards, Kuan-Wei