From nobody Tue Feb 10 09:24:46 2026 Received: from pb-smtp1.pobox.com (pb-smtp1.pobox.com [64.147.108.70]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 14F3C1DFEB; Sun, 7 Jul 2024 17:19:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=64.147.108.70 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720372769; cv=none; b=p2E757vXoHZso1HUNPDQffPRrGXZloLILoi7oRSEpgCr64pPIGOaJVjc0FQBlkfrP0tbu0n0YpiadI11LRfe5JnyI4AFct54dcR91ojLo+jqoxWjn9E6xbt5O4e2IuFAD2af2I+aPbu9184g6YlwLbdGinlmjB7qguNYX5bX49I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720372769; c=relaxed/simple; bh=DQ1QAacvuwMrmpkxxbOR3zurnYTNDoQ2zsyiFBbAL1g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AP/7KcUSumtifQjnYW0g3gtSKDMxp2PXD2XhSMZkCr3+LR9XEEbw8balSV3mzVUiR2HWM8uFeDOHUfVIO8txw/1Q/bWqQkLQSw2x0qAMiZzvvZpn3uXbRyCHPf1NvoYDAlitz1nmynD4/9HevtmyDTw154gvi/k9D9twMkWa6HU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=fluxnic.net; spf=pass smtp.mailfrom=fluxnic.net; dkim=pass (1024-bit key) header.d=pobox.com header.i=@pobox.com header.b=eeH5IMqz; dkim=fail (1024-bit key) header.d=fluxnic.net header.i=@fluxnic.net header.b=pQt6QfDW reason="signature verification failed"; arc=none smtp.client-ip=64.147.108.70 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=fluxnic.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=fluxnic.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=pobox.com header.i=@pobox.com header.b="eeH5IMqz"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=fluxnic.net header.i=@fluxnic.net header.b="pQt6QfDW" Received: from pb-smtp1.pobox.com (unknown [127.0.0.1]) by pb-smtp1.pobox.com (Postfix) with ESMTP id D0A21229C8; Sun, 7 Jul 2024 13:19:26 -0400 (EDT) (envelope-from nico@fluxnic.net) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed; d=pobox.com; h=from:to:cc :subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; s=sasl; bh=DQ1QAacvuwMrmpkxxbOR3zurn YTNDoQ2zsyiFBbAL1g=; b=eeH5IMqzTi55CWJGeQXzZVjACQc2LXjo6eWDoOvM0 fxqfVC7TmN4y213rT8KJNXHNtyk/DyIQb7XeqAL02CAlh7mS3Ty4CO4EkreicWCh fjw740pYpmUqpPvW2KdNQOjmodqyxMHbhTKdV6MsPokG2EfD/ZNxCvNgq2Qz8b0K zs= Received: from pb-smtp1.nyi.icgroup.com (unknown [127.0.0.1]) by pb-smtp1.pobox.com (Postfix) with ESMTP id C8B61229C7; Sun, 7 Jul 2024 13:19:26 -0400 (EDT) (envelope-from nico@fluxnic.net) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed; d=fluxnic.net; h=from:to:cc:subject:date:message-id:in-reply-to:references:mime-version:content-transfer-encoding; s=2016-12.pbsmtp; bh=9vregTxqV1G6NmQ0sYraOAMwCNG3P0fo7gosidspjcs=; b=pQt6QfDW+dunD5E11pFcXUjnC7XmaQZvPi2ap50EfBdgNlYYR7sJJkoPO2uJGFF08tu1ZE/pLzKFncy9xAZIT+fpP9VwJiFPr9Nu5iaHcM8EF3qtVGiTnTvbfFQHRWXg7Oh/O9xusRaAQw4snuiGnLAYL5hUOqZYoZvJQGUZuV0= Received: from yoda.fluxnic.net (unknown [184.162.15.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by pb-smtp1.pobox.com (Postfix) with ESMTPSA id 44A13229C5; Sun, 7 Jul 2024 13:19:26 -0400 (EDT) (envelope-from nico@fluxnic.net) Received: from xanadu.lan (OpenWrt.lan [192.168.1.1]) by yoda.fluxnic.net (Postfix) with ESMTPSA id 2C51AD3B28A; Sun, 7 Jul 2024 13:19:25 -0400 (EDT) From: Nicolas Pitre To: Arnd Bergmann , Russell King Cc: Nicolas Pitre , linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/4] lib/math/test_div64: add some edge cases relevant to __div64_const32() Date: Sun, 7 Jul 2024 13:17:33 -0400 Message-ID: <20240707171919.1951895-2-nico@fluxnic.net> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240707171919.1951895-1-nico@fluxnic.net> References: <20240707171919.1951895-1-nico@fluxnic.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Pobox-Relay-ID: 0FAB473C-3C85-11EF-9B30-5B6DE52EC81B-78420484!pb-smtp1.pobox.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Nicolas Pitre Be sure to test the extreme cases with and without bias. Signed-off-by: Nicolas Pitre --- lib/math/test_div64.c | 85 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 83 insertions(+), 2 deletions(-) diff --git a/lib/math/test_div64.c b/lib/math/test_div64.c index c15edd688d..3cd699b654 100644 --- a/lib/math/test_div64.c +++ b/lib/math/test_div64.c @@ -26,6 +26,9 @@ static const u64 test_div64_dividends[] =3D { 0x0072db27380dd689, 0x0842f488162e2284, 0xf66745411d8ab063, + 0xfffffffffffffffb, + 0xfffffffffffffffc, + 0xffffffffffffffff, }; #define SIZE_DIV64_DIVIDENDS ARRAY_SIZE(test_div64_dividends) =20 @@ -37,7 +40,10 @@ static const u64 test_div64_dividends[] =3D { #define TEST_DIV64_DIVISOR_5 0x0008a880 #define TEST_DIV64_DIVISOR_6 0x003fd3ae #define TEST_DIV64_DIVISOR_7 0x0b658fac -#define TEST_DIV64_DIVISOR_8 0xdc08b349 +#define TEST_DIV64_DIVISOR_8 0x80000001 +#define TEST_DIV64_DIVISOR_9 0xdc08b349 +#define TEST_DIV64_DIVISOR_A 0xfffffffe +#define TEST_DIV64_DIVISOR_B 0xffffffff =20 static const u32 test_div64_divisors[] =3D { TEST_DIV64_DIVISOR_0, @@ -49,13 +55,16 @@ static const u32 test_div64_divisors[] =3D { TEST_DIV64_DIVISOR_6, TEST_DIV64_DIVISOR_7, TEST_DIV64_DIVISOR_8, + TEST_DIV64_DIVISOR_9, + TEST_DIV64_DIVISOR_A, + TEST_DIV64_DIVISOR_B, }; #define SIZE_DIV64_DIVISORS ARRAY_SIZE(test_div64_divisors) =20 static const struct { u64 quotient; u32 remainder; -} test_div64_results[SIZE_DIV64_DIVISORS][SIZE_DIV64_DIVIDENDS] =3D { +} test_div64_results[SIZE_DIV64_DIVIDENDS][SIZE_DIV64_DIVISORS] =3D { { { 0x0000000013045e47, 0x00000001 }, { 0x000000000161596c, 0x00000030 }, @@ -65,6 +74,9 @@ static const struct { { 0x00000000000013c4, 0x0004ce80 }, { 0x00000000000002ae, 0x001e143c }, { 0x000000000000000f, 0x0033e56c }, + { 0x0000000000000001, 0x2b27507f }, + { 0x0000000000000000, 0xab275080 }, + { 0x0000000000000000, 0xab275080 }, { 0x0000000000000000, 0xab275080 }, }, { { 0x00000001c45c02d1, 0x00000000 }, @@ -75,7 +87,10 @@ static const struct { { 0x000000000001d637, 0x0004e5d9 }, { 0x0000000000003fc9, 0x000713bb }, { 0x0000000000000165, 0x029abe7d }, + { 0x000000000000001f, 0x673c193a }, { 0x0000000000000012, 0x6e9f7e37 }, + { 0x000000000000000f, 0xe73c1977 }, + { 0x000000000000000f, 0xe73c1968 }, }, { { 0x000000197a3a0cf7, 0x00000002 }, { 0x00000001d9632e5c, 0x00000021 }, @@ -85,7 +100,10 @@ static const struct { { 0x00000000001a7bb3, 0x00072331 }, { 0x00000000000397ad, 0x0002c61b }, { 0x000000000000141e, 0x06ea2e89 }, + { 0x00000000000001ca, 0x4c0a72e7 }, { 0x000000000000010a, 0xab002ad7 }, + { 0x00000000000000e5, 0x4c0a767b }, + { 0x00000000000000e5, 0x4c0a7596 }, }, { { 0x0000017949e37538, 0x00000001 }, { 0x0000001b62441f37, 0x00000055 }, @@ -95,7 +113,10 @@ static const struct { { 0x0000000001882ec6, 0x0005cbf9 }, { 0x000000000035333b, 0x0017abdf }, { 0x00000000000129f1, 0x0ab4520d }, + { 0x0000000000001a87, 0x18ff0472 }, { 0x0000000000000f6e, 0x8ac0ce9b }, + { 0x0000000000000d43, 0x98ff397f }, + { 0x0000000000000d43, 0x98ff2c3c }, }, { { 0x000011f321a74e49, 0x00000006 }, { 0x0000014d8481d211, 0x0000005b }, @@ -105,7 +126,10 @@ static const struct { { 0x0000000012a88828, 0x00036c97 }, { 0x000000000287f16f, 0x002c2a25 }, { 0x00000000000e2cc7, 0x02d581e3 }, + { 0x0000000000014318, 0x2ee07d7f }, { 0x000000000000bbf4, 0x1ba08c03 }, + { 0x000000000000a18c, 0x2ee303af }, + { 0x000000000000a18c, 0x2ee26223 }, }, { { 0x0000d8db8f72935d, 0x00000005 }, { 0x00000fbd5aed7a2e, 0x00000002 }, @@ -115,7 +139,10 @@ static const struct { { 0x00000000e16b20fa, 0x0002a14a }, { 0x000000001e940d22, 0x00353b2e }, { 0x0000000000ab40ac, 0x06fba6ba }, + { 0x00000000000f3f70, 0x0af7eeda }, { 0x000000000008debd, 0x72d98365 }, + { 0x0000000000079fb8, 0x0b166dba }, + { 0x0000000000079fb8, 0x0b0ece02 }, }, { { 0x000cc3045b8fc281, 0x00000000 }, { 0x0000ed1f48b5c9fc, 0x00000079 }, @@ -125,7 +152,10 @@ static const struct { { 0x0000000d43fce827, 0x00082b09 }, { 0x00000001ccaba11a, 0x0037e8dd }, { 0x000000000a13f729, 0x0566dffd }, + { 0x0000000000e5b64e, 0x3728203b }, { 0x000000000085a14b, 0x23d36726 }, + { 0x000000000072db27, 0x38f38cd7 }, + { 0x000000000072db27, 0x3880b1b0 }, }, { { 0x00eafeb9c993592b, 0x00000001 }, { 0x00110e5befa9a991, 0x00000048 }, @@ -135,7 +165,10 @@ static const struct { { 0x000000f4459740fc, 0x00084484 }, { 0x0000002122c47bf9, 0x002ca446 }, { 0x00000000b9936290, 0x004979c4 }, + { 0x000000001085e910, 0x05a83974 }, { 0x00000000099ca89d, 0x9db446bf }, + { 0x000000000842f488, 0x26b40b94 }, + { 0x000000000842f488, 0x1e71170c }, }, { { 0x1b60cece589da1d2, 0x00000001 }, { 0x01fcb42be1453f5b, 0x0000004f }, @@ -145,7 +178,49 @@ static const struct { { 0x00001c757dfab350, 0x00048863 }, { 0x000003dc4979c652, 0x00224ea7 }, { 0x000000159edc3144, 0x06409ab3 }, + { 0x00000001ecce8a7e, 0x30bc25e5 }, { 0x000000011eadfee3, 0xa99c48a8 }, + { 0x00000000f6674543, 0x0a593ae9 }, + { 0x00000000f6674542, 0x13f1f5a5 }, + }, { + { 0x1c71c71c71c71c71, 0x00000002 }, + { 0x0210842108421084, 0x0000000b }, + { 0x007f01fc07f01fc0, 0x000000fb }, + { 0x00014245eabf1f9a, 0x0000a63d }, + { 0x0000ffffffffffff, 0x0000fffb }, + { 0x00001d913cecc509, 0x0007937b }, + { 0x00000402c70c678f, 0x0005bfc9 }, + { 0x00000016766cb70b, 0x045edf97 }, + { 0x00000001fffffffb, 0x80000000 }, + { 0x0000000129d84b3a, 0xa2e8fe71 }, + { 0x0000000100000001, 0xfffffffd }, + { 0x0000000100000000, 0xfffffffb }, + }, { + { 0x1c71c71c71c71c71, 0x00000003 }, + { 0x0210842108421084, 0x0000000c }, + { 0x007f01fc07f01fc0, 0x000000fc }, + { 0x00014245eabf1f9a, 0x0000a63e }, + { 0x0000ffffffffffff, 0x0000fffc }, + { 0x00001d913cecc509, 0x0007937c }, + { 0x00000402c70c678f, 0x0005bfca }, + { 0x00000016766cb70b, 0x045edf98 }, + { 0x00000001fffffffc, 0x00000000 }, + { 0x0000000129d84b3a, 0xa2e8fe72 }, + { 0x0000000100000002, 0x00000000 }, + { 0x0000000100000000, 0xfffffffc }, + }, { + { 0x1c71c71c71c71c71, 0x00000006 }, + { 0x0210842108421084, 0x0000000f }, + { 0x007f01fc07f01fc0, 0x000000ff }, + { 0x00014245eabf1f9a, 0x0000a641 }, + { 0x0000ffffffffffff, 0x0000ffff }, + { 0x00001d913cecc509, 0x0007937f }, + { 0x00000402c70c678f, 0x0005bfcd }, + { 0x00000016766cb70b, 0x045edf9b }, + { 0x00000001fffffffc, 0x00000003 }, + { 0x0000000129d84b3a, 0xa2e8fe75 }, + { 0x0000000100000002, 0x00000003 }, + { 0x0000000100000001, 0x00000000 }, }, }; =20 @@ -208,6 +283,12 @@ static bool __init test_div64(void) return false; if (!test_div64_one(dividend, TEST_DIV64_DIVISOR_8, i, 8)) return false; + if (!test_div64_one(dividend, TEST_DIV64_DIVISOR_9, i, 9)) + return false; + if (!test_div64_one(dividend, TEST_DIV64_DIVISOR_A, i, 10)) + return false; + if (!test_div64_one(dividend, TEST_DIV64_DIVISOR_B, i, 11)) + return false; for (j =3D 0; j < SIZE_DIV64_DIVISORS; j++) { if (!test_div64_one(dividend, test_div64_divisors[j], i, j)) --=20 2.45.2