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GET /api/patches/2227841/?format=api
{ "id": 2227841, "url": "http://patchwork.ozlabs.org/api/patches/2227841/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260424104325.81484-1-philmd@linaro.org/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api", "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": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260424104325.81484-1-philmd@linaro.org>", "list_archive_url": null, "date": "2026-04-24T10:43:25", "name": "[v3] target/s390x: Leverage 128-bit vector type in V{L, ST}L opcodes", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "af5ecb4c548cda07fbf070718d8459b7c42d7e61", "submitter": { "id": 85046, "url": "http://patchwork.ozlabs.org/api/people/85046/?format=api", "name": "Philippe Mathieu-Daudé", "email": "philmd@linaro.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260424104325.81484-1-philmd@linaro.org/mbox/", "series": [ { "id": 501344, "url": "http://patchwork.ozlabs.org/api/series/501344/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=501344", "date": "2026-04-24T10:43:25", "name": "[v3] target/s390x: Leverage 128-bit vector type in V{L, ST}L opcodes", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/501344/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2227841/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2227841/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=yF6/NFxr;\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::330;\n envelope-from=philmd@linaro.org; helo=mail-wm1-x330.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=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 <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "The access is unaligned (MO_UNALN), we can easily replace the 2\nconsecutive 64-bit calls by a single 128-bit one.\nConsidering atomicity of the new 128-bit access, the both opcodes\nVLL (Vector Load with Length) and VSTL (Vector STore with Length)\naccess byte granularity, so use MO_ATOM_NONE.\n\nSigned-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>\n---\nBased-on: <20260423135035.50126-1-philmd@linaro.org>\n\nv3:\n- do not increase addr (Ilya)\n- MO_ATOM_NONE (Richard)\n---\n target/s390x/tcg/vec.h | 12 ++++++++++++\n target/s390x/tcg/vec_helper.c | 17 ++++++-----------\n 2 files changed, 18 insertions(+), 11 deletions(-)", "diff": "diff --git a/target/s390x/tcg/vec.h b/target/s390x/tcg/vec.h\nindex 8d095efcfc6..34413f7e029 100644\n--- a/target/s390x/tcg/vec.h\n+++ b/target/s390x/tcg/vec.h\n@@ -13,8 +13,10 @@\n #define S390X_VEC_H\n \n #include \"tcg/tcg.h\"\n+#include \"qemu/int128.h\"\n \n typedef union S390Vector {\n+ Int128 quadword;\n uint64_t doubleword[2];\n uint32_t word[4];\n uint16_t halfword[8];\n@@ -72,6 +74,11 @@ static inline uint64_t s390_vec_read_element64(const S390Vector *v, uint8_t enr)\n return v->doubleword[enr];\n }\n \n+static inline Int128 s390_vec_read_element128(const S390Vector *v)\n+{\n+ return v->quadword;\n+}\n+\n static inline uint64_t s390_vec_read_element(const S390Vector *v, uint8_t enr,\n uint8_t es)\n {\n@@ -117,6 +124,11 @@ static inline void s390_vec_write_element64(S390Vector *v, uint8_t enr,\n v->doubleword[enr] = data;\n }\n \n+static inline void s390_vec_write_element128(S390Vector *v, Int128 data)\n+{\n+ v->quadword = data;\n+}\n+\n static inline void s390_vec_write_element(S390Vector *v, uint8_t enr,\n uint8_t es, uint64_t data)\n {\ndiff --git a/target/s390x/tcg/vec_helper.c b/target/s390x/tcg/vec_helper.c\nindex 98eecd9fde6..a86819f61b6 100644\n--- a/target/s390x/tcg/vec_helper.c\n+++ b/target/s390x/tcg/vec_helper.c\n@@ -48,14 +48,11 @@ void HELPER(vll)(CPUS390XState *env, void *v1, uint64_t addr, uint64_t bytes)\n MemOpIdx oi;\n \n if (likely(bytes >= 16)) {\n- uint64_t t0, t1;\n+ Int128 t;\n \n- oi = make_memop_idx(MO_BE | MO_64 | MO_UNALN, mmu_idx);\n- t0 = cpu_ldq_mmu(env, addr, oi, ra);\n- addr = wrap_address(env, addr + 8);\n- t1 = cpu_ldq_mmu(env, addr, oi, ra);\n- s390_vec_write_element64(v1, 0, t0);\n- s390_vec_write_element64(v1, 1, t1);\n+ oi = make_memop_idx(MO_128 | MO_UNALN | MO_ATOM_NONE | MO_BE, mmu_idx);\n+ t = cpu_ld16_mmu(env, addr, oi, ra);\n+ s390_vec_write_element128(v1, t);\n } else {\n S390Vector tmp = {};\n \n@@ -206,10 +203,8 @@ void HELPER(vstl)(CPUS390XState *env, const void *v1, uint64_t addr,\n probe_write_access(env, addr, MIN(bytes, 16), GETPC());\n \n if (likely(bytes >= 16)) {\n- oi = make_memop_idx(MO_BE | MO_64 | MO_UNALN, mmu_idx);\n- cpu_stq_mmu(env, addr, s390_vec_read_element64(v1, 0), oi, ra);\n- addr = wrap_address(env, addr + 8);\n- cpu_stq_mmu(env, addr, s390_vec_read_element64(v1, 1), oi, ra);\n+ oi = make_memop_idx(MO_128 | MO_UNALN | MO_ATOM_NONE | MO_BE, mmu_idx);\n+ cpu_st16_mmu(env, addr, s390_vec_read_element128(v1), oi, ra);\n } else {\n oi = make_memop_idx(MO_8, mmu_idx);\n \n", "prefixes": [ "v3" ] }