Date: Thu, 10 Mar 2011 08:27:40 +0000 From: Alexander Best <arundel@freebsd.org> To: Dimitry Andric <dim@FreeBSD.org> Cc: gerald@freebsd.org, Martin Matuska <mm@freebsd.org>, current@freebsd.org Subject: Re: [TESTING] ssse3 backport from gcc 4.3 Message-ID: <20110310082740.GA74075@freebsd.org> In-Reply-To: <4D7810B2.4090207@FreeBSD.org> References: <4D7799FD.9040008@FreeBSD.org> <20110309211820.GA46520@zim.MIT.EDU> <4D7810B2.4090207@FreeBSD.org>
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On Thu Mar 10 11, Dimitry Andric wrote: > On 2011-03-09 22:18, David Schultz wrote: > >The proliferation of -mno-sse -mno-sse2 -mno-sse3 options in the > >makefiles is probably not needed: I'm pretty sure -mno-sse implies > >the other two, unless -msse3 is specified explicitly. > > Indeed, contrib/gcc/config/i386/i386.c has: > > static bool > ix86_handle_option (size_t code, const char *arg ATTRIBUTE_UNUSED, int > value) > { > ... > case OPT_msse: > if (!value) > { > target_flags &= ~(MASK_SSE2 | MASK_SSE3); > target_flags_explicit |= MASK_SSE2 | MASK_SSE3; > } > return true; > > E.g -mno-sse disables SSE2 and SSE3, unless you explicitly add -msse2 or > -msse3 options. In Martin's patch, this fragment uses MASK_SSSE3 too. +1 for removing -mno-sse2, -mno-sse3 and -mno-ssse3 throughout the source tree. ...also -mfpmath=387 is still present for amd64 and i don't think it's necessary. with -mno-sse i don't think -mfpmath=sse remains the default for amd64. > > Clang has a similar mechanism, -mno-sse disables all 'higher' SSE > variants too. -- a13x
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