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Mon, 23 Feb 2026 12:56:36 -0800 (PST) From: Taylor Simpson To: qemu-devel@nongnu.org Cc: brian.cain@oss.qualcomm.com, matheus.bernardino@oss.qualcomm.com, sid.manning@oss.qualcomm.com, marco.liebel@oss.qualcomm.com, richard.henderson@linaro.org, philmd@linaro.org, ale@rev.ng, anjo@rev.ng, ltaylorsimpson@gmail.com Subject: [PATCH 3/8] Hexagon (tests/tcg/hexagon) Add tests for multi-destination instructions Date: Mon, 23 Feb 2026 13:56:27 -0700 Message-ID: <20260223205632.223714-4-ltaylorsimpson@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260223205632.223714-1-ltaylorsimpson@gmail.com> References: <20260223205632.223714-1-ltaylorsimpson@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::32e; envelope-from=ltaylorsimpson@gmail.com; helo=mail-ot1-x32e.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, 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1771880297824158500 Instructions such as post-increment loads define multiple destinations These make it harder to detect multi-write conflicts Signed-off-by: Taylor Simpson --- tests/tcg/hexagon/multiple-writes.c | 60 +++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/tests/tcg/hexagon/multiple-writes.c b/tests/tcg/hexagon/multip= le-writes.c index 8686317fdc..4305903547 100644 --- a/tests/tcg/hexagon/multiple-writes.c +++ b/tests/tcg/hexagon/multiple-writes.c @@ -143,6 +143,62 @@ static int test_zero(void) return sig; } =20 +/* Test multiple post-increment writes to the same GPR */ +static int test_post_increment1(void) +{ + int sig; + + asm volatile( + "r0 =3D #0\n" + "r1 =3D ##1f\n" + "memw(%1) =3D r1\n" + ".word 0x9b004021 /* { r1 =3D memb(r0++#1) */\n" + ".word 0x9b00c022 /* r2 =3D memb(r0++#1) } */\n" + "1:\n" + "%0 =3D r0\n" + : "=3Dr"(sig) + : "r"(&resume_pc) + : "r0", "r1", "memory"); + + return sig; +} + +static int test_post_increment2(void) +{ + int sig; + + asm volatile( + "r0 =3D #0\n" + "r1 =3D ##1f\n" + "memw(%1) =3D r1\n" + ".word 0x9b00c020 /* r0 =3D memb(r0++#1) */\n" + "1:\n" + "%0 =3D r0\n" + : "=3Dr"(sig) + : "r"(&resume_pc) + : "r0", "r1", "memory"); + + return sig; +} + +static int test_post_increment3(void) +{ + int sig; + + asm volatile( + "r0 =3D #0\n" + "r1 =3D ##1f\n" + "memw(%1) =3D r1\n" + ".word 0x9bc1c020 /* r1:0 =3D memd(r1++#8) */\n" + "1:\n" + "%0 =3D r0\n" + : "=3Dr"(sig) + : "r"(&resume_pc) + : "r0", "r1", "memory"); + + return sig; +} + int main() { struct sigaction act; @@ -164,6 +220,10 @@ int main() /* Illegal: zero encoding =3D duplex with duplicate dest R0 */ assert(test_zero() =3D=3D SIGILL); =20 + assert(test_post_increment1() =3D=3D SIGILL); + assert(test_post_increment2() =3D=3D SIGILL); + assert(test_post_increment3() =3D=3D SIGILL); + puts("PASS"); return EXIT_SUCCESS; } --=20 2.43.0