[{"id":37888,"web_url":"https://patchwork.libcamera.org/comment/37888/","msgid":"<176910269663.302817.17890178679238950041@localhost>","date":"2026-01-22T17:24:56","subject":"Re: [PATCH v6 03/16] ipa: libipa: fixedpoint: Fix unsigned usage","submitter":{"id":184,"url":"https://patchwork.libcamera.org/api/people/184/","name":"Stefan Klug","email":"stefan.klug@ideasonboard.com"},"content":"Hi Kieran,\n\nQuoting Kieran Bingham (2026-01-21 18:37:22)\n> The fixedToFloatingPoint does not support unsigned Q types, and\n> incorrectly sign-extends all values which have the top most bit set in\n> the quantized values.\n> \n> Fix this by ensuring that only signed types perform sign extension, and\n> simplify the calculation for unsigned types.\n\nI need to digest that a bit. That means a signed fixed point number must\nalways be represented by a signed integral type?\n\nI didn't expect that, to me it feels strange to represent any fixed\npoint value as signed int. I need to think about that. But it seems to\nintroduce an asymmetry. In rkisp1/algorithms/ccm.cpp we convert a float\nto uint16_t which carries a signed FP value. So if I'm not mistaken the\nbackwards conversion of that ccm value would now be broken?\n\nBest regards,\nStefan\n\n> \n> Convert the storage of the test cases to signed types to correctly\n> represent their intended purpose, to prevent test failures.\n> \n> Reviewed-by: Isaac Scott \n> Signed-off-by: Kieran Bingham \n> \n> ---\n> \n> v6:\n> \n> - Use T{1} << F instead of 1 << F\n> \n> Signed-off-by: Kieran Bingham \n> ---\n> src/ipa/libipa/fixedpoint.h | 3 +++\n> test/ipa/libipa/fixedpoint.cpp | 6 +++---\n> 2 files changed, 6 insertions(+), 3 deletions(-)\n> \n> diff --git a/src/ipa/libipa/fixedpoint.h b/src/ipa/libipa/fixedpoint.h\n> index 709cf50f0fcd..48a9757f9554 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> static_assert(sizeof(int) >= sizeof(T));\n> static_assert(I + F <= sizeof(T) * 8);\n> \n> + if constexpr (std::is_unsigned_v)\n> + return static_cast(number) / static_cast(T{1} << F);\n> +\n> /*\n> * Recreate the upper bits in case of a negative number by shifting the sign\n> * bit from the fixed point to the first bit of the unsigned and then right shifting\n> diff --git a/test/ipa/libipa/fixedpoint.cpp b/test/ipa/libipa/fixedpoint.cpp\n> index 99eb662ddf4e..4b017e86a74f 100644\n> --- a/test/ipa/libipa/fixedpoint.cpp\n> +++ b/test/ipa/libipa/fixedpoint.cpp\n> @@ -68,7 +68,7 @@ protected:\n> * The second 7.992 test is to test that unused bits don't\n> * affect the result.\n> */\n> - std::map testCases = {\n> + std::map testCases = {\n> { 7.992, 0x3ff },\n> { 0.2, 0x01a },\n> { -0.2, 0x7e6 },\n> @@ -81,14 +81,14 @@ protected:\n> \n> int ret;\n> for (const auto &testCase : testCases) {\n> - ret = testSingleFixedPoint<4, 7, uint16_t>(testCase.first,\n> + ret = testSingleFixedPoint<4, 7, int16_t>(testCase.first,\n> testCase.second);\n> if (ret != TestPass)\n> return ret;\n> }\n> \n> /* Special case with a superfluous one in the unused bits */\n> - ret = testFixedToFloat<4, 7, uint16_t, double>(0xbff, 7.992);\n> + ret = testFixedToFloat<4, 7, int16_t, double>(0xbff, 7.992);\n> if (ret != TestPass)\n> return ret;\n> \n> -- \n> 2.52.0\n>","headers":{"Return-Path":"","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 2F30BBDCBF\n\tfor ;\n\tThu, 22 Jan 2026 17:25:03 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 35FD961FC9;\n\tThu, 22 Jan 2026 18:25:02 +0100 (CET)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 2008961F84\n\tfor ;\n\tThu, 22 Jan 2026 18:25:00 +0100 (CET)","from ideasonboard.com (unknown\n\t[IPv6:2a00:6020:448c:6c00:bc8e:214:d514:699a])\n\tby perceval.ideasonboard.com (Postfix) with UTF8SMTPSA id 4D0E2460;\n\tThu, 22 Jan 2026 18:24:27 +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=\"JmvpfRWI\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1769102667;\n\tbh=tnokTS3J6TmUMLHA7FRggTf8zDgOL793bTSiSQMrxkk=;\n\th=In-Reply-To:References:Subject:From:Cc:To:Date:From;\n\tb=JmvpfRWI5/S6UiGtpvyZTH9SgcdyYm9bYL3oNEVJ5QlbTOujJrZwWP1pmr/LgY3Qy\n\tYq90xqRcF5a3U6hj8FEzwA59ZgBkxzJh+xhmsMAH+3ddvkZrcE9H7NGQ5aHCYF4A4w\n\ttlyqFBtHDzojVKXNUU4OWWVZRMDD+GO7M+fuowJ4=","Content-Type":"text/plain; charset=\"utf-8\"","MIME-Version":"1.0","Content-Transfer-Encoding":"quoted-printable","In-Reply-To":"<20260121173737.376113-4-kieran.bingham@ideasonboard.com>","References":"<20260121173737.376113-1-kieran.bingham@ideasonboard.com>\n\t<20260121173737.376113-4-kieran.bingham@ideasonboard.com>","Subject":"Re: [PATCH v6 03/16] ipa: libipa: fixedpoint: Fix unsigned usage","From":"Stefan Klug ","Cc":"Kieran Bingham ,\n\tIsaac Scott ","To":"Kieran Bingham ,\n\tlibcamera devel ","Date":"Thu, 22 Jan 2026 18:24:56 +0100","Message-ID":"<176910269663.302817.17890178679238950041@localhost>","User-Agent":"alot/0.12.dev8+g2c003385c862.d20250602","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}},{"id":37889,"web_url":"https://patchwork.libcamera.org/comment/37889/","msgid":"<176910382112.1808100.12927529481697634614@ping.linuxembedded.co.uk>","date":"2026-01-22T17:43:41","subject":"Re: [PATCH v6 03/16] ipa: libipa: fixedpoint: Fix unsigned usage","submitter":{"id":4,"url":"https://patchwork.libcamera.org/api/people/4/","name":"Kieran Bingham","email":"kieran.bingham@ideasonboard.com"},"content":"Quoting Stefan Klug (2026-01-22 17:24:56)\n> Hi Kieran,\n> \n> Quoting Kieran Bingham (2026-01-21 18:37:22)\n> > The fixedToFloatingPoint does not support unsigned Q types, and\n> > incorrectly sign-extends all values which have the top most bit set in\n> > the quantized values.\n> > \n> > Fix this by ensuring that only signed types perform sign extension, and\n> > simplify the calculation for unsigned types.\n> \n> I need to digest that a bit. That means a signed fixed point number must\n> always be represented by a signed integral type?\n\nYes, up to this point - both 'signed' and 'unsigned' types are\nrepresented and stored into an 'unsigned' underlying integral type when\nprocessed through these functions.\n\n> I didn't expect that, to me it feels strange to represent any fixed\n> point value as signed int. I need to think about that. But it seems to\n> introduce an asymmetry. In rkisp1/algorithms/ccm.cpp we convert a float\n> to uint16_t which carries a signed FP value. So if I'm not mistaken the\n> backwards conversion of that ccm value would now be broken?\n\nNo, the addition of\n\n\tif constexpr (std::is_unsigned_v)\n\t\treturn static_cast(number) / static_cast(T{1} << F);\n\nshould keep it working at this stage, though by the end of this series -\nas you'll see these functions are completely removed, so please do\ncertainly check that the CCM value is handled correctly by the new\ntypes.\n\n\n--\nKieran\n\n\n\n> \n> Best regards,\n> Stefan\n> \n> > \n> > Convert the storage of the test cases to signed types to correctly\n> > represent their intended purpose, to prevent test failures.\n> > \n> > Reviewed-by: Isaac Scott \n> > Signed-off-by: Kieran Bingham \n> > \n> > ---\n> > \n> > v6:\n> > \n> > - Use T{1} << F instead of 1 << F\n> > \n> > Signed-off-by: Kieran Bingham \n> > ---\n> > src/ipa/libipa/fixedpoint.h | 3 +++\n> > test/ipa/libipa/fixedpoint.cpp | 6 +++---\n> > 2 files changed, 6 insertions(+), 3 deletions(-)\n> > \n> > diff --git a/src/ipa/libipa/fixedpoint.h b/src/ipa/libipa/fixedpoint.h\n> > index 709cf50f0fcd..48a9757f9554 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> > static_assert(sizeof(int) >= sizeof(T));\n> > static_assert(I + F <= sizeof(T) * 8);\n> > \n> > + if constexpr (std::is_unsigned_v)\n> > + return static_cast(number) / static_cast(T{1} << F);\n> > +\n> > /*\n> > * Recreate the upper bits in case of a negative number by shifting the sign\n> > * bit from the fixed point to the first bit of the unsigned and then right shifting\n> > diff --git a/test/ipa/libipa/fixedpoint.cpp b/test/ipa/libipa/fixedpoint.cpp\n> > index 99eb662ddf4e..4b017e86a74f 100644\n> > --- a/test/ipa/libipa/fixedpoint.cpp\n> > +++ b/test/ipa/libipa/fixedpoint.cpp\n> > @@ -68,7 +68,7 @@ protected:\n> > * The second 7.992 test is to test that unused bits don't\n> > * affect the result.\n> > */\n> > - std::map testCases = {\n> > + std::map testCases = {\n> > { 7.992, 0x3ff },\n> > { 0.2, 0x01a },\n> > { -0.2, 0x7e6 },\n> > @@ -81,14 +81,14 @@ protected:\n> > \n> > int ret;\n> > for (const auto &testCase : testCases) {\n> > - ret = testSingleFixedPoint<4, 7, uint16_t>(testCase.first,\n> > + ret = testSingleFixedPoint<4, 7, int16_t>(testCase.first,\n> > testCase.second);\n> > if (ret != TestPass)\n> > return ret;\n> > }\n> > \n> > /* Special case with a superfluous one in the unused bits */\n> > - ret = testFixedToFloat<4, 7, uint16_t, double>(0xbff, 7.992);\n> > + ret = testFixedToFloat<4, 7, int16_t, double>(0xbff, 7.992);\n> > if (ret != TestPass)\n> > return ret;\n> > \n> > -- \n> > 2.52.0\n> >","headers":{"Return-Path":"","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 DEA9EC3220\n\tfor ;\n\tThu, 22 Jan 2026 17:43:45 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 27C9A61FC5;\n\tThu, 22 Jan 2026 18:43:45 +0100 (CET)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id C3ED361FBB\n\tfor ;\n\tThu, 22 Jan 2026 18:43:43 +0100 (CET)","from pendragon.ideasonboard.com\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 0B0F7460;\n\tThu, 22 Jan 2026 18:43:10 +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=\"APBgOVGt\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1769103791;\n\tbh=LJQuv4zG7kPhRP0aOe4dRwlQvi4xlNOsBm5g/VHCwzQ=;\n\th=In-Reply-To:References:Subject:From:Cc:To:Date:From;\n\tb=APBgOVGtudFNxM4vSRQbSPUd3uNZxze6itCtnYfbCV2sEkV5fwTjD8bDLSlfycGA9\n\tOa3KZDjX3jJcCmIudWlnFO4w+wYlxt4FdZVr2Ng3XvIb3tqXe4eJeBwT4pglqS/xyC\n\t7g5M67sF69jeLnsGlOPypCww3HuuIcXkIlpzje3o=","Content-Type":"text/plain; charset=\"utf-8\"","MIME-Version":"1.0","Content-Transfer-Encoding":"quoted-printable","In-Reply-To":"<176910269663.302817.17890178679238950041@localhost>","References":"<20260121173737.376113-1-kieran.bingham@ideasonboard.com>\n\t<20260121173737.376113-4-kieran.bingham@ideasonboard.com>\n\t<176910269663.302817.17890178679238950041@localhost>","Subject":"Re: [PATCH v6 03/16] ipa: libipa: fixedpoint: Fix unsigned usage","From":"Kieran Bingham ","Cc":"Isaac Scott ","To":"Stefan Klug ,\n\tlibcamera devel ","Date":"Thu, 22 Jan 2026 17:43:41 +0000","Message-ID":"<176910382112.1808100.12927529481697634614@ping.linuxembedded.co.uk>","User-Agent":"alot/0.9.1","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}},{"id":37891,"web_url":"https://patchwork.libcamera.org/comment/37891/","msgid":"<176910392088.1808100.16359474154996333828@ping.linuxembedded.co.uk>","date":"2026-01-22T17:45:20","subject":"Re: [PATCH v6 03/16] ipa: libipa: fixedpoint: Fix unsigned usage","submitter":{"id":4,"url":"https://patchwork.libcamera.org/api/people/4/","name":"Kieran Bingham","email":"kieran.bingham@ideasonboard.com"},"content":"Quoting Kieran Bingham (2026-01-22 17:43:41)\n> Quoting Stefan Klug (2026-01-22 17:24:56)\n> > Hi Kieran,\n> > \n> > Quoting Kieran Bingham (2026-01-21 18:37:22)\n> > > The fixedToFloatingPoint does not support unsigned Q types, and\n> > > incorrectly sign-extends all values which have the top most bit set in\n> > > the quantized values.\n> > > \n> > > Fix this by ensuring that only signed types perform sign extension, and\n> > > simplify the calculation for unsigned types.\n> > \n> > I need to digest that a bit. That means a signed fixed point number must\n> > always be represented by a signed integral type?\n> \n> Yes, up to this point - both 'signed' and 'unsigned' types are\n> represented and stored into an 'unsigned' underlying integral type when\n> processed through these functions.\n> \n> > I didn't expect that, to me it feels strange to represent any fixed\n> > point value as signed int. I need to think about that. But it seems to\n> > introduce an asymmetry. In rkisp1/algorithms/ccm.cpp we convert a float\n> > to uint16_t which carries a signed FP value. So if I'm not mistaken the\n> > backwards conversion of that ccm value would now be broken?\n\nOh - wait - do you mean I need to change the storage type of\nrkisp1/algorithms/ccm.cpp to an int16_t 'in this patch' before it gets\nconverted perhaps!?\n\n\n> \n> No, the addition of\n> \n> if constexpr (std::is_unsigned_v)\n> return static_cast(number) / static_cast(T{1} << F);\n> \n> should keep it working at this stage, though by the end of this series -\n> as you'll see these functions are completely removed, so please do\n> certainly check that the CCM value is handled correctly by the new\n> types.\n> \n> \n> --\n> Kieran\n> \n> \n> \n> > \n> > Best regards,\n> > Stefan\n> > \n> > > \n> > > Convert the storage of the test cases to signed types to correctly\n> > > represent their intended purpose, to prevent test failures.\n> > > \n> > > Reviewed-by: Isaac Scott \n> > > Signed-off-by: Kieran Bingham \n> > > \n> > > ---\n> > > \n> > > v6:\n> > > \n> > > - Use T{1} << F instead of 1 << F\n> > > \n> > > Signed-off-by: Kieran Bingham \n> > > ---\n> > > src/ipa/libipa/fixedpoint.h | 3 +++\n> > > test/ipa/libipa/fixedpoint.cpp | 6 +++---\n> > > 2 files changed, 6 insertions(+), 3 deletions(-)\n> > > \n> > > diff --git a/src/ipa/libipa/fixedpoint.h b/src/ipa/libipa/fixedpoint.h\n> > > index 709cf50f0fcd..48a9757f9554 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> > > static_assert(sizeof(int) >= sizeof(T));\n> > > static_assert(I + F <= sizeof(T) * 8);\n> > > \n> > > + if constexpr (std::is_unsigned_v)\n> > > + return static_cast(number) / static_cast(T{1} << F);\n> > > +\n> > > /*\n> > > * Recreate the upper bits in case of a negative number by shifting the sign\n> > > * bit from the fixed point to the first bit of the unsigned and then right shifting\n> > > diff --git a/test/ipa/libipa/fixedpoint.cpp b/test/ipa/libipa/fixedpoint.cpp\n> > > index 99eb662ddf4e..4b017e86a74f 100644\n> > > --- a/test/ipa/libipa/fixedpoint.cpp\n> > > +++ b/test/ipa/libipa/fixedpoint.cpp\n> > > @@ -68,7 +68,7 @@ protected:\n> > > * The second 7.992 test is to test that unused bits don't\n> > > * affect the result.\n> > > */\n> > > - std::map testCases = {\n> > > + std::map testCases = {\n> > > { 7.992, 0x3ff },\n> > > { 0.2, 0x01a },\n> > > { -0.2, 0x7e6 },\n> > > @@ -81,14 +81,14 @@ protected:\n> > > \n> > > int ret;\n> > > for (const auto &testCase : testCases) {\n> > > - ret = testSingleFixedPoint<4, 7, uint16_t>(testCase.first,\n> > > + ret = testSingleFixedPoint<4, 7, int16_t>(testCase.first,\n> > > testCase.second);\n> > > if (ret != TestPass)\n> > > return ret;\n> > > }\n> > > \n> > > /* Special case with a superfluous one in the unused bits */\n> > > - ret = testFixedToFloat<4, 7, uint16_t, double>(0xbff, 7.992);\n> > > + ret = testFixedToFloat<4, 7, int16_t, double>(0xbff, 7.992);\n> > > if (ret != TestPass)\n> > > return ret;\n> > > \n> > > -- \n> > > 2.52.0\n> > >","headers":{"Return-Path":"","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 EDA49BDCBF\n\tfor ;\n\tThu, 22 Jan 2026 17:45:25 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 9405861FC4;\n\tThu, 22 Jan 2026 18:45:25 +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 D09F761F84\n\tfor ;\n\tThu, 22 Jan 2026 18:45:23 +0100 (CET)","from pendragon.ideasonboard.com\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 25BF8460;\n\tThu, 22 Jan 2026 18:44:51 +0100 (CET)"],"Authentication-Results":"lancelot.ideasonboard.com; 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