{"id":2222918,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2222918/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260414005348.4767-2-philmd@linaro.org/","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/1.1/projects/14/?format=json","name":"QEMU Development","link_name":"qemu-devel","list_id":"qemu-devel.nongnu.org","list_email":"qemu-devel@nongnu.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260414005348.4767-2-philmd@linaro.org>","date":"2026-04-14T00:53:40","name":"[v2,1/9] target/arm: Ignore endianness when setting MTE tags","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"b9902252acb755842b1bae9d41b450d3c5ef07c6","submitter":{"id":85046,"url":"http://patchwork.ozlabs.org/api/1.1/people/85046/?format=json","name":"Philippe Mathieu-Daudé","email":"philmd@linaro.org"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260414005348.4767-2-philmd@linaro.org/mbox/","series":[{"id":499764,"url":"http://patchwork.ozlabs.org/api/1.1/series/499764/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=499764","date":"2026-04-14T00:53:39","name":"target/arm: Remove MO_TE to compile MVE/M helpers once","version":2,"mbox":"http://patchwork.ozlabs.org/series/499764/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2222918/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2222918/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=D27+WbTp;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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charset=UTF-8","Content-Transfer-Encoding":"8bit","Received-SPF":"pass client-ip=2a00:1450:4864:20::336;\n envelope-from=philmd@linaro.org; helo=mail-wm1-x336.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,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=unavailable 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":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"},"content":"As mentioned by Richard in [*]:\n\n We don't actually need any specific endianness here, because\n every byte has the same value. So we could simply drop MO_TE.\n That would produce a store in host-endianness, which will be\n fractionally more efficient on some hosts.\n\n[*] https://lore.kernel.org/qemu-devel/d64d3576-9188-4e74-afdc-3492c9feb8e0@linaro.org/\n\nReviewed-by: Richard Henderson \nSigned-off-by: Philippe Mathieu-Daudé \n---\n target/arm/tcg/helper-a64.c | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)","diff":"diff --git a/target/arm/tcg/helper-a64.c b/target/arm/tcg/helper-a64.c\nindex 2dec587d386..9f0801b88b8 100644\n--- a/target/arm/tcg/helper-a64.c\n+++ b/target/arm/tcg/helper-a64.c\n@@ -1019,7 +1019,7 @@ static uint64_t set_step_tags(CPUARMState *env, uint64_t toaddr,\n * the page dirty and will use the fast path.\n */\n uint64_t repldata = data * 0x0101010101010101ULL;\n- MemOpIdx oi16 = make_memop_idx(MO_TE | MO_128, memidx);\n+ MemOpIdx oi16 = make_memop_idx(MO_128, memidx);\n cpu_st16_mmu(env, toaddr, int128_make128(repldata, repldata), oi16, ra);\n mte_mops_set_tags(env, toaddr, 16, *mtedesc);\n return 16;\n","prefixes":["v2","1/9"]}