On Wed, Feb 05, 2014 at 11:43:21PM +0000, David Laight wrote: > On Wed, Feb 05, 2014 at 03:09:59PM -0800, Matt Thomas wrote: > > > > >> > > >> This breaks clang. Please do not depend on one SSE option disabling > > >> another. > > > > > > Without those flags I believe gcc might generate x87 instructions. > > > Quite possibly even for amd64. > > > See a very recent linux fix. > > > Try searching for: Disable generation of traditional x87 instructions > > > > I think Joerg is saying put in -mno-sse2 since that is not disabled > > by -mno-sse when using clang. > > with the gcc I'm looking at (if I'm reading to code properly): > no-sse => no-sse2 => no-sse3 => no-ssse3 & no-sse4a => no-sse4_1 > => no-sse4_2 => no-avx => no-fma => no-fma4
While I mostly believe that -mno-sse will imply -mno-sse2, it is the one I want to be explicit about since it is default feature of the amd64 platform. Joerg
