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{ "id": 25799, "url": "https://patchwork.libcamera.org/api/patches/25799/?format=api", "web_url": "https://patchwork.libcamera.org/patch/25799/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/projects/1/?format=api", "name": "libcamera", "link_name": "libcamera", "list_id": "libcamera_core", "list_email": "libcamera-devel@lists.libcamera.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20260114173918.1744023-4-kieran.bingham@ideasonboard.com>", "date": "2026-01-14T17:39:03", "name": "[v5,03/16] ipa: libipa: fixedpoint: Fix unsigned usage", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "8b23a39c0ce22e03aa6fa04cf48c55e1049c7eb9", "submitter": { "id": 4, "url": "https://patchwork.libcamera.org/api/people/4/?format=api", "name": "Kieran Bingham", "email": "kieran.bingham@ideasonboard.com" }, "delegate": null, "mbox": "https://patchwork.libcamera.org/patch/25799/mbox/", "series": [ { "id": 5708, "url": "https://patchwork.libcamera.org/api/series/5708/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=5708", "date": "2026-01-14T17:39:00", "name": "libipa: Introduce a Quantized type", "version": 5, "mbox": "https://patchwork.libcamera.org/series/5708/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/25799/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/25799/checks/", "tags": {}, "headers": { "Return-Path": "<libcamera-devel-bounces@lists.libcamera.org>", "X-Original-To": "parsemail@patchwork.libcamera.org", "Delivered-To": "parsemail@patchwork.libcamera.org", "Received": [ "from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 61106C3274\n\tfor <parsemail@patchwork.libcamera.org>;\n\tWed, 14 Jan 2026 17:39:34 +0000 (UTC)", "from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id B932F61FD8;\n\tWed, 14 Jan 2026 18:39:27 +0100 (CET)", "from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 5AFE461FBC\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tWed, 14 Jan 2026 18:39:23 +0100 (CET)", "from Monstersaurus.infra.iob\n\t(cpc89244-aztw30-2-0-cust6594.18-1.cable.virginm.net [86.31.185.195])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 679961E43;\n\tWed, 14 Jan 2026 18:38:56 +0100 (CET)" ], "Authentication-Results": "lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"FHECP9il\"; dkim-atps=neutral", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1768412336;\n\tbh=Oz5+iydAOiXwieOaY0iM+ms3+pAUlSkp5TaVa1wjFpA=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=FHECP9ilrdtlnf0CX8DcnxiemUjGB+XiXwFcXk9LdZg0SJqBnQh7y+epxfQLKVmho\n\tgIwmqsWIjhcu+mmqas/3FUUeoI0Nkj2+ln5sXnEytpS+/nZZyJw7xds2ZC72ZbgnOb\n\tTV/W7YHp2SQIhsAjJ54oGOblkloELYJ22zeBbVB4=", "From": "Kieran Bingham <kieran.bingham@ideasonboard.com>", "To": "libcamera devel <libcamera-devel@lists.libcamera.org>", "Cc": "Kieran Bingham <kieran.bingham@ideasonboard.com>,\n\tIsaac Scott <isaac.scott@ideasonboard.com>", "Subject": "[PATCH v5 03/16] ipa: libipa: fixedpoint: Fix unsigned usage", "Date": "Wed, 14 Jan 2026 17:39:03 +0000", "Message-ID": "<20260114173918.1744023-4-kieran.bingham@ideasonboard.com>", "X-Mailer": "git-send-email 2.52.0", "In-Reply-To": "<20260114173918.1744023-1-kieran.bingham@ideasonboard.com>", "References": "<20260114173918.1744023-1-kieran.bingham@ideasonboard.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-BeenThere": "libcamera-devel@lists.libcamera.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "<libcamera-devel.lists.libcamera.org>", "List-Unsubscribe": "<https://lists.libcamera.org/options/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=unsubscribe>", "List-Archive": "<https://lists.libcamera.org/pipermail/libcamera-devel/>", "List-Post": "<mailto:libcamera-devel@lists.libcamera.org>", "List-Help": "<mailto:libcamera-devel-request@lists.libcamera.org?subject=help>", "List-Subscribe": "<https://lists.libcamera.org/listinfo/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=subscribe>", "Errors-To": "libcamera-devel-bounces@lists.libcamera.org", "Sender": "\"libcamera-devel\" <libcamera-devel-bounces@lists.libcamera.org>" }, "content": "The fixedToFloatingPoint does not support unsigned Q types, and\nincorrectly sign-extends all values which have the top most bit set in\nthe quantized values.\n\nFix this by ensuring that only signed types perform sign extension, and\nsimplify the calculation for unsigned types.\n\nConvert the storage of the test cases to signed types to correctly\nrepresent their intended purpose, to prevent test failures.\n\nReviewed-by: Isaac Scott <isaac.scott@ideasonboard.com>\nSigned-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>\n---\n src/ipa/libipa/fixedpoint.h | 3 +++\n test/ipa/libipa/fixedpoint.cpp | 6 +++---\n 2 files changed, 6 insertions(+), 3 deletions(-)", "diff": "diff --git a/src/ipa/libipa/fixedpoint.h b/src/ipa/libipa/fixedpoint.h\nindex 709cf50f0fcd..b4a7fa5e0ecd 100644\n--- a/src/ipa/libipa/fixedpoint.h\n+++ b/src/ipa/libipa/fixedpoint.h\n@@ -49,6 +49,9 @@ constexpr R fixedToFloatingPoint(T number)\n \tstatic_assert(sizeof(int) >= sizeof(T));\n \tstatic_assert(I + F <= sizeof(T) * 8);\n \n+\tif constexpr (std::is_unsigned_v<T>)\n+\t\treturn static_cast<R>(number) / static_cast<R>(1 << F);\n+\n \t/*\n \t * Recreate the upper bits in case of a negative number by shifting the sign\n \t * bit from the fixed point to the first bit of the unsigned and then right shifting\ndiff --git a/test/ipa/libipa/fixedpoint.cpp b/test/ipa/libipa/fixedpoint.cpp\nindex 99eb662ddf4e..4b017e86a74f 100644\n--- a/test/ipa/libipa/fixedpoint.cpp\n+++ b/test/ipa/libipa/fixedpoint.cpp\n@@ -68,7 +68,7 @@ protected:\n \t\t * The second 7.992 test is to test that unused bits don't\n \t\t * affect the result.\n \t\t */\n-\t\tstd::map<double, uint16_t> testCases = {\n+\t\tstd::map<double, int16_t> testCases = {\n \t\t\t{ 7.992, 0x3ff },\n \t\t\t{ 0.2, 0x01a },\n \t\t\t{ -0.2, 0x7e6 },\n@@ -81,14 +81,14 @@ protected:\n \n \t\tint ret;\n \t\tfor (const auto &testCase : testCases) {\n-\t\t\tret = testSingleFixedPoint<4, 7, uint16_t>(testCase.first,\n+\t\t\tret = testSingleFixedPoint<4, 7, int16_t>(testCase.first,\n \t\t\t\t\t\t\t\t testCase.second);\n \t\t\tif (ret != TestPass)\n \t\t\t\treturn ret;\n \t\t}\n \n \t\t/* Special case with a superfluous one in the unused bits */\n-\t\tret = testFixedToFloat<4, 7, uint16_t, double>(0xbff, 7.992);\n+\t\tret = testFixedToFloat<4, 7, int16_t, double>(0xbff, 7.992);\n \t\tif (ret != TestPass)\n \t\t\treturn ret;\n \n", "prefixes": [ "v5", "03/16" ] }