Patch Detail
get:
Show a patch.
patch:
Update a patch.
put:
Update a patch.
GET /api/patches/2230693/?format=api
{ "id": 2230693, "url": "http://patchwork.ozlabs.org/api/patches/2230693/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260430000524.56046-41-richard.henderson@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": "<20260430000524.56046-41-richard.henderson@linaro.org>", "list_archive_url": null, "date": "2026-04-30T00:05:23", "name": "[v2,40/40] fpu: Introduce exp_scalbn", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "07fa93049a0caed91d1168b3d3685846d2e34b43", "submitter": { "id": 72104, "url": "http://patchwork.ozlabs.org/api/people/72104/?format=api", "name": "Richard Henderson", "email": "richard.henderson@linaro.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260430000524.56046-41-richard.henderson@linaro.org/mbox/", "series": [ { "id": 502170, "url": "http://patchwork.ozlabs.org/api/series/502170/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=502170", "date": "2026-04-30T00:04:48", "name": "fpu: Export some internals for targets", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/502170/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2230693/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2230693/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=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=ztFFbXer;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g5ZLy04B6z1yHv\n\tfor <incoming@patchwork.ozlabs.org>; Thu, 30 Apr 2026 10:10:32 +1000 (AEST)", "from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from <qemu-devel-bounces@nongnu.org>)\n\tid 1wIEyp-0007n2-Q4; Wed, 29 Apr 2026 20:10:11 -0400", "from eggs.gnu.org ([2001:470:142:3::10])\n by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <richard.henderson@linaro.org>)\n id 1wIEyk-0007Cf-Oh\n for qemu-devel@nongnu.org; Wed, 29 Apr 2026 20:10:07 -0400", "from mail-pf1-x430.google.com ([2607:f8b0:4864:20::430])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)\n (Exim 4.90_1) (envelope-from <richard.henderson@linaro.org>)\n id 1wIEyi-00038v-Qq\n for qemu-devel@nongnu.org; Wed, 29 Apr 2026 20:10:06 -0400", "by mail-pf1-x430.google.com with SMTP id\n d2e1a72fcca58-82fa8d6425bso180182b3a.0\n for <qemu-devel@nongnu.org>; Wed, 29 Apr 2026 17:10:04 -0700 (PDT)", "from stoup.. ([180.233.125.15]) by smtp.gmail.com with ESMTPSA id\n d2e1a72fcca58-834ed80df96sm3052272b3a.54.2026.04.29.17.10.01\n (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n Wed, 29 Apr 2026 17:10:02 -0700 (PDT)" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed;\n d=linaro.org; s=google; t=1777507803; x=1778112603; darn=nongnu.org;\n h=content-transfer-encoding:mime-version:references:in-reply-to\n :message-id:date:subject:cc:to:from:from:to:cc:subject:date\n :message-id:reply-to;\n bh=Tno4FRdkKISmgYOrfh62o7rJBcHuyC+6/bmV3xDjQJQ=;\n b=ztFFbXerc4HuGW0krNWKbnR5FkasZB15K5h6UPzXvBi668tYlAizx5/CbxcqbhQUam\n Ni1YRGSOvZVLLyfVnvnvgdbjbz8dCPyxzMfEE80+GxAy7aU4M2x/h125OKKYCISQbIYO\n QRwHmYCvgGz7uEIQFNAWXTtN4POBW08Pzs6/IHRVoiY8KCj02vv6JmvzV6CzGrA11OtJ\n slFVlcsw/MdsY3PjcW38JROP/QazvQUyCNS/LvpOfWu3TveTeHu6jutKxoRrShb15eoJ\n 4CnTasvYmie3WEuEWSn+l9sBayqfqXEjqnAjiVnyHGveHJMkeXmEa6WNJfuiGFAwuOYt\n VtUg==", "X-Google-DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed;\n d=1e100.net; s=20251104; t=1777507803; x=1778112603;\n h=content-transfer-encoding:mime-version:references:in-reply-to\n :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from\n :to:cc:subject:date:message-id:reply-to;\n bh=Tno4FRdkKISmgYOrfh62o7rJBcHuyC+6/bmV3xDjQJQ=;\n b=Mt/ZXgTOoNRB+GjhVGuMdNX2B/rV7fUB7p/VPFOW7cOsuPFnFppD8Nt4iOZHLM0Mpu\n va2r89NqGCUSaBZBPBDw338qmVErJbKNZQddv6T1h0NiI3qmd3xz38bkLjvlFmX1geQm\n AfbqCb0Kka+rBIZWPGt6kEzlVnGmV7M4YWRBdbycXcbaKPpENjeWecJ6NvbeaGd9ZGxe\n cCwQAdNdVUgA4xYU9JsHRxVznLfG2OF6Qyob7HHXEweEy67xkGTvZU5AzsPERMBRtWJa\n 8r8nQFF1lbTjj4o1V+j1hmKp4yCx3gjM6PvwSe/6qQWtPGzXX2ATFfg+Fq0xdaeLs8Jk\n r3pQ==", "X-Gm-Message-State": "AOJu0YywDEGpVVpVirafSz++VNhbV3UyPhS5q90YopiXyAG7T/mvMR4Z\n hOGrq83zxuMVRotJQcLZhd5240wolZrOfl0qiyRkXifB5Uq3/IehR16STY4H4jQPSgLVLJAUa1z\n Q0QI6LP4=", "X-Gm-Gg": "AeBDietLqcE1tIjKNZMCvrJSIaDvxci5UeANDLPxvP0xritfaqbFCB0M+6sNJ6XM2GK\n lAbaPZZZ8wmnOfuI8e8urel0XLR5hiJdqg2oPCCeLtCxXmrTVX08eANzEZb7U/J3Y3vbeCLyhCM\n BjGLeWUF1r5Szj/I6BpxW4aCZIebi5PePlPLvDLMdOB+NqlUkElYYGzOEcLhx0zpgA+/b/B23rw\n /xoa5S2S4fMqLehHH4ESuFfJVL9ElkCVKWDsQ9EUK09qzsvCvxWVZvdYNUhg1gsd45Irq3RPtuM\n cz+hTwloCRYoYOaG2Zl70sz2423cTNZB+nNBH0yuhGK3w10Fp5OfavQeXKJYXrREFgBCP6aRmll\n moDgsjJeIZXMPHHqtA4sDB0udi3ZdTKAeblOhC0wxMfaGw3eAhVmYyu+Dmnk4nI3fmtbxPKwEMp\n pQ7f/pKBJgzyxJCJgztOTevWgylw3A+eDnAfD5YxpaZ1Yt/TQ8kR8=", "X-Received": "by 2002:a05:6a00:4c8d:b0:82f:48e:241c with SMTP id\n d2e1a72fcca58-834fdbe464amr754190b3a.23.1777507803242;\n Wed, 29 Apr 2026 17:10:03 -0700 (PDT)", "From": "Richard Henderson <richard.henderson@linaro.org>", "To": "qemu-devel@nongnu.org", "Cc": "philmd@linaro.org", "Subject": "[PATCH v2 40/40] fpu: Introduce exp_scalbn", "Date": "Thu, 30 Apr 2026 10:05:23 +1000", "Message-ID": "<20260430000524.56046-41-richard.henderson@linaro.org>", "X-Mailer": "git-send-email 2.43.0", "In-Reply-To": "<20260430000524.56046-1-richard.henderson@linaro.org>", "References": "<20260430000524.56046-1-richard.henderson@linaro.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Received-SPF": "pass client-ip=2607:f8b0:4864:20::430;\n envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x430.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": "Avoid exponent overflow as well as checking that we don't\nlose information with opposing scaling. Use it in partsN(scalbn)\nand partsN(round_to_int_normal).\n\nSigned-off-by: Richard Henderson <richard.henderson@linaro.org>\n---\n fpu/softfloat.c | 17 +++++++++++++++++\n fpu/softfloat-parts.c.inc | 5 ++---\n 2 files changed, 19 insertions(+), 3 deletions(-)", "diff": "diff --git a/fpu/softfloat.c b/fpu/softfloat.c\nindex 6a14c5d639..a6ab3ee0f8 100644\n--- a/fpu/softfloat.c\n+++ b/fpu/softfloat.c\n@@ -601,6 +601,23 @@ static float128 QEMU_FLATTEN float128_pack_raw(const FloatParts128 *p)\n *----------------------------------------------------------------------------*/\n #include \"softfloat-specialize.c.inc\"\n \n+static int32_t exp_scalbn(int32_t exp, int32_t scale)\n+{\n+ /*\n+ * Catch chains of scaling which lose information.\n+ * In particular, if the exponent has been saturated,\n+ * do not allow it to become unsaturated.\n+ */\n+ if (unlikely(exp == INT32_MAX)) {\n+ assert(scale >= 0);\n+ } else if (unlikely(exp == INT32_MIN)) {\n+ assert(scale <= 0);\n+ } else {\n+ exp = sadd32_saturate(exp, scale);\n+ }\n+ return exp;\n+}\n+\n /*\n * Helper functions for softfloat-parts.c.inc, per-size operations.\n */\ndiff --git a/fpu/softfloat-parts.c.inc b/fpu/softfloat-parts.c.inc\nindex c5a828eb90..789a41d24e 100644\n--- a/fpu/softfloat-parts.c.inc\n+++ b/fpu/softfloat-parts.c.inc\n@@ -1107,8 +1107,7 @@ static bool partsN(round_to_int_normal)(FloatPartsN *a, FloatRoundMode rmode,\n uint64_t frac_lsb, frac_lsbm1, rnd_even_mask, rnd_mask, inc;\n int shift_adj;\n \n- scale = MIN(MAX(scale, -0x10000), 0x10000);\n- a->exp += scale;\n+ a->exp = exp_scalbn(a->exp, scale);\n \n if (a->exp < 0) {\n bool one;\n@@ -1632,7 +1631,7 @@ FloatPartsN partsN(scalbn)(const FloatPartsN *a, int n, float_status *s)\n case float_class_normal:\n {\n FloatPartsN r = *a;\n- r.exp += MIN(MAX(n, -0x10000), 0x10000);\n+ r.exp = exp_scalbn(r.exp, n);\n return r;\n }\n default:\n", "prefixes": [ "v2", "40/40" ] }