From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:4978:20e::2]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 99E542C00A5 for ; Mon, 13 May 2013 20:33:12 +1000 (EST) Message-ID: <1368441187.24723.38.camel@i7.infradead.org> Subject: Re: [PATCH] powerpc: provide __bswapdi2 From: David Woodhouse To: Michael Neuling Date: Mon, 13 May 2013 11:33:07 +0100 In-Reply-To: <9813.1368428999@ale.ozlabs.ibm.com> References: <1368220707.3378.57.camel@shinybook.infradead.org> <9813.1368428999@ale.ozlabs.ibm.com> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-kCK4vT79EeEH0yCV35Xt" Mime-Version: 1.0 Cc: linuxppc-dev@ozlabs.org, viro@zeniv.linux.org.uk List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --=-kCK4vT79EeEH0yCV35Xt Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2013-05-13 at 17:09 +1000, Michael Neuling wrote: >=20 > This doesn't work for me but the below does: ... >=20 > stolen from GCC -02 output of: > unsigned long long __bswapdi2(unsigned long long x) Hm, so was mine: [dwmw2@i7 ~]$ powerpc64-linux-gnu-gcc -O2 -S -o- bswapdi2.c -m32 .file "bswapdi2.c" .section ".text" .align 2 .p2align 4,,15 .globl __bswapdi2 .type __bswapdi2, @function __bswapdi2: rlwinm 10,4,8,0xffffffff rlwinm 11,3,8,0xffffffff rlwimi 10,4,24,0,7 rlwimi 11,3,24,0,7 rlwimi 10,4,24,16,23 rlwimi 11,3,24,16,23 mr 4,11 mr 3,10 blr .size __bswapdi2,.-__bswapdi2 .ident "GCC: (GNU) 4.7.2 20121105 (Red Hat 4.7.2-2.aa.20121114svn)" On Mon, 2013-05-13 at 09:33 +0200, Gabriel Paubert wrote: > Actually, I'd swap the two mr instructions to never > have an instruction that uses the result from the > previous one.=20 Bad GCC. No biscuit. Should we file a PR?=20 --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-kCK4vT79EeEH0yCV35Xt Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISxDCCBjQw ggQcoAMCAQICAR4wDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0YXJ0 Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcxKTAn BgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3MTAyNDIxMDE1NVoX DTE3MTAyNDIxMDE1NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSsw KQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWduaW5nMTgwNgYDVQQDEy9TdGFy dENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENsaWVudCBDQTCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAMcJg8zOLdgasSmkLhOrlr6KMoOMpohBllVHrdRvEg/q6r8jR+EK 75xCGhR8ToREoqe7zM9/UnC6TS2y9UKTpT1v7RSMzR0t6ndl0TWBuUr/UXBhPk+Kmy7bI4yW4urC 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