From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from m15113.mail.126.com (m15113.mail.126.com [220.181.15.113]) by sourceware.org (Postfix) with ESMTPS id AB10E3851C01 for ; Sun, 24 May 2020 13:51:16 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org AB10E3851C01 Received: from [192.168.1.2] (unknown [101.86.245.181]) by smtp3 (Coremail) with SMTP id DcmowACH_fnAe8pe0YRMFg--.14623S2; Sun, 24 May 2020 21:50:57 +0800 (CST) Subject: Re: Ref:unsigned int 2 ulong type promotion issue in GCC! To: "Thamilarasu Kandasamy (thamil)" , "gcc-help@gcc.gnu.org" References: From: Liu Hao Openpgp: preference=signencrypt Autocrypt: addr=lh_mouse@126.com; keydata= mQINBFvNzjsBEADgRSHQwFcRdrKpmUxYOyjJKduTZgGP90O0ZrSUzqjuM5x/0NpjgV3PRk7S OWMJAQ3u66jyG/iZnMzpIca+gdObCtaqHPG5NyOwlUjlQcRI7tTaJWGjwVTco2np6z1msAkE L4dRCwVaud5U8LoukcQcuBiCrsdx2Sp9QUR33lUEfQajks0HKFvHHqdooHiflEY89lLpcM18 r+VMXviPrBPBoYesvYWSWLEDKnAkxl+y2KjPFnCUYFh4eHlh2GndUGPZMCYqu8t8EJcfl/Zp nRkHjRDhqwNHHj2JCTO2U12H25G0C2pvlbeZNTDnTp7m0YGsnp6RO4sFYxQE0f4rxqA1K7BP gBdlqdOJO/CasCMNeGqjP1lcSIJ38/EBLR/GyM7yNwT9P1oowy3KE+w0NlSrWxLU4zs873Ev SKx33xcmyVkZyZjMWA+OFt4LM57fK/CwJc3C0yFYJsutpP0espCr2IJLGEcP/srL71SRFZ9I nZBnV3uyWPxWDvjB0tDLmXCi1I7Uprz607yCjxEiHlclk1KSrRizRL/XJNbz3TxqbiwRjp6+ u2OJZv1j8XGb6XCWdEEyQYS47pFLHthocdlTutrHjFFMYIh8jvcX2ulX3I2aWuiqyGep32Zd gLxWCk4VdKnmLVMG53ERTXKR/GfH31uwWRpD212Zq1VU6weeVwARAQABtBpMaXUgSGFvIDxs aF9tb3VzZUAxMjYuY29tPokCVAQTAQoAPhYhBJ/XgxqbURL361kXj0GzMngiMVvEBQJbzc47 AhsjBQkJZgGABQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAAAoJEEGzMngiMVvEOBAP/jnQVwl7 IQKTr1xd2WRkQ+yefR+QFP1a0ujPPSKxne0e+6K97qt51E8JELGCdIoVXlzsvaFXSIqVgncH 0VnV9ciDV7jlBI/G66btRZDfGwYBSSOmgz/rTkBrpmC8+lPbqUDWdLx5J6bjUroS8XWlN3oS RZAPI+RzWjT89S+q19HGESuV+/h9OTxO51RIeA4/XVueWXFWaZ2ZQrsiBE2HZg1rZ2654i4b OnKOgFyj4FibZXmcSgDr6O6LjaXVCm2dfZZ2jkjEMzaI/FRE/yj2EKciKk5Fjy6lpWG/xyCn YhGgI6THu1Ynbz2RMm1cSISXJkC73xfkAjpRsHM0yAFU3EAlGGMo8eDV3VhFDGftPZFqd4uN YC7ku9PSxi1UF+T//QXqerSIofLegjG9Lu3brILV6f5BqhUod6++EqenydndpSvvxHjrSFz0 qzQEDpcc/sPDQbtYayAKHYzGV6SPITiAnItoB7M43WNW56uJtULuuZhRz9r6umJa1Y+gzCkt kDW1yAcWQ5VEAcI4mUBHvbmS9KKnTbw6SRQvHSXMELOVVPYjZceiA9NacESuVuwfVLm9O7vR 4ADFm4cColAsdm62vcbLLohws1MMMAw9SvL1X0v2VxCAYf40pUPtg3DHJWwdi7By4aSc4pqn 6DtDMXrMZ3oqQKKgMM/d+ohw+KGJuQINBFvNzjsBEADGwb/XwE2xzrUnmMjsIpobIOG6sjS2 WE0n/ocTe2cWqSLxwSAwNQ9LXJSgNb9qTTSxLKN/exHFMIalpypN8gpckQ13mGziayYb2LzS 2E9Rlocp91Fv3grR5lrMkCAMtKpcSj1d4hOdMcLOTiJTmDNz06FSmSQBwO3RzrwSCFVibOWn 444cdsc2nd6R96pcff2EnT8h0wrZnwqCUmqTFxVwYcZvTCM/qh8kbUB6cFfk9qOf/az62Yxo jatBBle63xv4SyhRwIokeLzQpU3MeNTLFYEBUkD91min8Du/NfhYS3ZwU6J3vMTm+53kru2N hOMqlgBAs24aJsJYeM2YIPbLVw5ZdG9AvrxTRxVu78DTlgypYMbkM7OFGqWBNamFmhFHZkSi PVHJm225B0tByBpdpxCZtWo2K4ygjE/tqBiN26U1WBjiZb2YO6qw32hnIlSt2t8nX+R+sLJW 9ypolc/Mh+FWdQD/g0JoOimT0d8D8awF1jia8W8MkRREWuUHFEkoDL4M9t+2yNGhpBsW1cXf MUNzOyP/E6I8GzgEWWovz/ut1j6uWPABCCxytrjGwZw/yqA9yqQjHC8rdzfD2r4rKz8MRpJF qWvL4Arco90so8eJpYLHyTtV7pfVHnWXPktoPTkMqUgQ8twDeywI/VT+sgOIXBP8d5HU0afE bDr+GQARAQABiQI8BBgBCgAmFiEEn9eDGptREvfrWRePQbMyeCIxW8QFAlvNzjsCGwwFCQlm AYAACgkQQbMyeCIxW8TKUhAAuQypJgJ7wIpjzji+Y/2hAhaxEnrCsUjcF6L0b2HSvuy+F2/a kuptJWa2MGUCbzQK5/Ki9S3+s7SxfzjiTk83CB/nKPuMORGly2f84H7fyKWzJCjkxmnV7PnQ iofkJLA6uoxsVR5t72kWL/s/OwcxRP5KJvMVaSUVxWrcStfcc8+FcKetDIqS3u3rHPpJO+uW MFBOJM97Cz2sSMfJ0ZpgIpKDM5Qh/Ak2Fw6dzh99V+mpBVGEL98dAibuzdKbFBZTmgSOgaJT b7i4D0hK2fxyHZE9iiCjqlO8EIGRrjWAr8I5y+d2sDPSkuJUmFXhctRem0do+fNvmUwAyNGD SqWW0mtlTOe1Ur0rcYcgq3owgABOlM6qdbPyZ6sEUbJ0RtR86+ksfhrxtLUf0oz84eqrGjFd NYTVgomeWDuW6q+a5JX4YN9LbYc9OZhjfNTJ0q5K00JvqOHPLYertlF3uscbA+KKhvtZ3x8w o2xAthMRzUGlYy+lHGJ8zUE7PKkeD2rBYfMs7mId7EQ8UNc6ZwvmL0WtZhTiXpmJNAtWBWeG D7zfJr1Z5i/s7tOMyAi6e8J9l5pt6IPa//uByXAGcdOzPADdAxlBLPkJStS/m2RFfDTbdWiZ Flo+wGMdJXNbeLQ4ykdbLbkeTBCH9TSQVmH34GlTT/O6N8xQJF7PSp+Sn0w= Message-ID: Date: Sun, 24 May 2020 21:50:52 +0800 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="biZ9MtCPWz4ALDZdSgAbajT8xsknVqy3L" X-CM-TRANSID: DcmowACH_fnAe8pe0YRMFg--.14623S2 X-Coremail-Antispam: 1Uf129KBjvdXoW7Jr4fZF1UtFWxZF1UZF1xGrg_yoWfGrb_Xr 4qyrZrCw1agryDWr12qryDJ3W7G3WUX343ua1rXFWFkr1rZr43XF1kWr97trWrWw4rZ3W2 93yjk343Aw4Y9jkaLaAFLSUrUUUUUb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7IUnt73DUUUUU== X-Originating-IP: [101.86.245.181] X-CM-SenderInfo: 5okbz0xxvhqiyswou0bp/1tbikwEuRlpD-T6mVwAAsR X-Spam-Status: No, score=0.5 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, RCVD_IN_BARRACUDACENTRAL, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=no autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: gcc-help@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-help mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 24 May 2020 13:51:19 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --biZ9MtCPWz4ALDZdSgAbajT8xsknVqy3L Content-Type: multipart/mixed; boundary="Ycm4e3nl7kscqevkaaOsRF8MOIP459m3B"; protected-headers="v1" From: Liu Hao To: "Thamilarasu Kandasamy (thamil)" , "gcc-help@gcc.gnu.org" Message-ID: Subject: Re: Ref:unsigned int 2 ulong type promotion issue in GCC! References: In-Reply-To: --Ycm4e3nl7kscqevkaaOsRF8MOIP459m3B Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable =E5=9C=A8 2020/5/24 21:31, Thamilarasu Kandasamy (thamil) via Gcc-help =E5= =86=99=E9=81=93: >=20 > int size =3D 100; > unsigned int usize =3D 100; >=20 > result1 =3D (void *) (((uintptr_t) &var) & ~(size - 1)); > result2 =3D (void *) (((uintptr_t) &var) & ~(usize - 1)); > result3 =3D (void *) (((uintptr_t) &var) & ~((unsigned long int)us= ize - 1)); >=20 `result1` is bitwise AND `&var` with `(uintptr_t)~(int)99` which is `(uintptr_t)(int)-100` which is probably `0xFFFFFFFFFFFFFF9C` on a 64-bit machine. `result2` is bitwise AND `&var` with `(uintptr_t)~(unsigned)99` which is likely `(uintptr_t)(unsigned)4294967196` which is `0xFFFFFF9C` on a 64-bit machine. So higher half is truncated as expected. `result3` is bitwise AND `&var` with `(uintptr_t)~(unsigned long)99` which is probably `0xFFFFFFFFFFFFFF9C` on a 64-bit machine. There is no bug. --=20 Best regards, LH_Mouse --Ycm4e3nl7kscqevkaaOsRF8MOIP459m3B-- --biZ9MtCPWz4ALDZdSgAbajT8xsknVqy3L Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEn9eDGptREvfrWRePQbMyeCIxW8QFAl7Ke70ACgkQQbMyeCIx W8TMjA/7BZND2EGR/MzjCs8YkAeznuFMBh639kkISvB/K1ZrRQ/aajEXtPK6k9Xu Uviz5lpBSZYoF1Yk2e2d89JtnxwbnVa7CTzrl8mSVikYFv+wEl1qpcgNIDnIUXwF APojHOLyZ84UV5K3tmDnsjYfduhqHmdXhtq5OGPYZdHPFDaZ23LthbM+sr6TlCx5 KO35b0f35QqarWpTeKK68KXNqNufQ0kw2XqeqHOV1awHYkNH+dCJ8zi8Gc13YU0l e4dB9vwrtDTBZmX9wGrTeKSdb/R28pTLfFNS0ysdBm93/XoVuK6sTaemXCjN3G0+ mRdXv4qgV4X3bw4IufLvJDqv8zYzVNKosQCRZqrPpisbVz22u4VX4nOMkcGb0mBQ 8cSBLMIbAjtS8K9SOsYRG/j+7q/1mdCbaqt5EOz3wH0Bd9QaXuKwf7DYaBXBCnLr B2eW1evM703GsnpgjX9c7VbzoLPyY7oBIim5GJTuT+QY3XzykxtkA8PQ97cXw7Ua EY2Ui/l8zo/IbtXhNrXKtc+EhVcRQ/FKSEh5RjX1nnQVl2NN1qIcet6MMv3sMnLM R8Baz+yNIeZpyLFTQBJ+/ouEOtDgEfmZoZDjAGq/rfSTPqdUmyK2w6JrAs9d/7zy w0EUOKCfsvjK2my+uik2WSCw32+YxdhvadPoR6jNy7PrK9okcig= =50nS -----END PGP SIGNATURE----- --biZ9MtCPWz4ALDZdSgAbajT8xsknVqy3L--