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{ "id": 2195373, "url": "http://patchwork.ozlabs.org/api/covers/2195373/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/cover/20260210214044.1174699-1-iii@linux.ibm.com/", "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": "<20260210214044.1174699-1-iii@linux.ibm.com>", "list_archive_url": null, "date": "2026-02-10T21:38:59", "name": "[v5,0/5] target/s390x: Implement DIVIDE TO INTEGER", "submitter": { "id": 74525, "url": "http://patchwork.ozlabs.org/api/people/74525/?format=api", "name": "Ilya Leoshkevich", "email": "iii@linux.ibm.com" }, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/cover/20260210214044.1174699-1-iii@linux.ibm.com/mbox/", "series": [ { "id": 491741, "url": "http://patchwork.ozlabs.org/api/series/491741/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=491741", "date": "2026-02-10T21:39:00", "name": "target/s390x: Implement DIVIDE TO INTEGER", "version": 5, "mbox": "http://patchwork.ozlabs.org/series/491741/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2195373/comments/", "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=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=LQ0mHOyx;\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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a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc\n :content-transfer-encoding:content-type:date:from:message-id\n :mime-version:subject:to; s=pp1; bh=S0A9I4tLQc3/8LGEgvl9eT15NuCK\n OA583ihe38JnFSI=; b=LQ0mHOyx4q1oOKujXjGHNcqXt+EwihsnJfxNaZXNqJnx\n OXyGwcREkXNXIFp3PhKnizK3LK6hvRuKhjz8wU7JeEjH13XptpuMinUw3sz0A4Xq\n OyOCeIeyNGaa2DEzxb1k/yuhHyFz/rtFxbTXSpgIoaW4wBLV9bL0PegCtMHjQAVV\n 1uQQiY4CYjZeWtdDZ7c6beZHEY+9Y/q1BU+6M9q6ZbyyUEzZkINOZrguAhq10dsg\n lSSokToDgb83RjR5pV1VDT6ddwa6FPAWZgcFLeLGyvB5WybkEmhP6EnNNh/LMgkH\n qwAC+BbQKIRkPX6C4M5g52yT2oddo8nP2zLLhFNs5w==", "From": "Ilya Leoshkevich <iii@linux.ibm.com>", "To": "Thomas Huth <thuth@redhat.com>,\n Richard Henderson <richard.henderson@linaro.org>", "Cc": "David Hildenbrand <david@kernel.org>, qemu-s390x@nongnu.org,\n qemu-devel@nongnu.org, Ilya Leoshkevich <iii@linux.ibm.com>", "Subject": "[PATCH v5 0/5] target/s390x: Implement DIVIDE TO INTEGER", "Date": "Tue, 10 Feb 2026 22:38:59 +0100", "Message-ID": "<20260210214044.1174699-1-iii@linux.ibm.com>", "X-Mailer": "git-send-email 2.52.0", "MIME-Version": "1.0", "Content-Type": "text/plain; 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envelope-from=iii@linux.ibm.com;\n helo=mx0b-001b2d01.pphosted.com", "X-Spam_score_int": "-19", "X-Spam_score": "-2.0", "X-Spam_bar": "--", "X-Spam_report": "(-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001,\n RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n 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 <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": "v4: https://lore.kernel.org/qemu-devel/20260204121026.645382-1-iii@linux.ibm.com/\nv4 -> v5: Restore \"& 63\" in 3/5, add a comment, drop R-b (Thomas).\n\nv3: https://lore.kernel.org/qemu-devel/20260129190902.196262-1-iii@linux.ibm.com/\nv3 -> v4: Use parts_round_to_int_normal() (Richard).\n Drop saved_flags.\n Collect R-bs (Thomas, Richard).\n\nv2: https://lore.kernel.org/qemu-devel/20260127153736.62730-1-iii@linux.ibm.com/\nv2 -> v3: Use FloatParts64 (Richard).\n Improve \"smallish\" comment (Richard).\n Use parts_muladd_scalbn (Richard).\n Get rid of manual precision rounding (Richard).\n New patch: parts_round_to_int_normal() improvement.\n New 64-bit testcase for a fuzzer finding on one of the\n intermediate versions. I have to admit I did not put down and\n then forgot what exactly it was about, but it must be\n interesting, so I decided to keep it.\n\nv1: https://lore.kernel.org/qemu-devel/20260121222116.713325-1-iii@linux.ibm.com/\nv1 -> v2: Move the implementatation to fpu/ and rewrite using\n FloatParts (Richard). I can't say I particularly like the way\n it looks, but at least most macros are gone and it survives\n fuzzing.\n Explain why we need -O0 for the test (Alex).\n New patch: s390_get_bfp_rounding_mode().\n Add a few comments with calculation examples to the test.\n\nHi,\n\nThis series implements DIVIDE TO INTEGER instruction, which is\nrequired to run LuaJIT.\n\nPatch 1 is a debugging helper, patch 2 is a small refactoring, patch 3\nis an improvement for an FPU rounding helper, patch 4 is the\nimplementation.\n\nSince the instruction is quite complex, I've extensively tested it\nusing a libFuzzer-based harness [1] that compares emulation with native\nexecution at ~15k exec/s. The tests (patch 5) use data generated\nthis way.\n\nBest regards,\nIlya\n\n[1] https://gitlab.com/iii-i/qemu/-/tags/iii/wip/fuzz-tcg/v2\n\nIlya Leoshkevich (5):\n target/s390x: Dump Floating-Point-Control Register\n target/s390x: Extract s390_get_bfp_rounding_mode()\n fpu: Restrict parts_round_to_int_normal to target precision\n target/s390x: Implement DIVIDE TO INTEGER\n tests/tcg/s390x: Test DIVIDE TO INTEGER\n\n fpu/softfloat-parts.c.inc | 12 +-\n fpu/softfloat.c | 142 +++++++++++++++\n include/fpu/softfloat.h | 11 ++\n target/s390x/cpu-dump.c | 1 +\n target/s390x/helper.h | 1 +\n target/s390x/tcg/fpu_helper.c | 118 +++++++++----\n target/s390x/tcg/insn-data.h.inc | 5 +-\n target/s390x/tcg/translate.c | 26 +++\n tests/tcg/s390x/Makefile.target | 5 +\n tests/tcg/s390x/divide-to-integer.c | 265 ++++++++++++++++++++++++++++\n 10 files changed, 548 insertions(+), 38 deletions(-)\n create mode 100644 tests/tcg/s390x/divide-to-integer.c" }