lvqcl wrote: > Dave Yeo wrote: > > >>> >on other OSes: > >>> > --enable-sse: > >>> > add -msse2 to the compiler switches > >>> > test SSE OS support (why?) > > >>> >It's a bit contradictory: why test whether *BSD etc support SSE or not > >>> >but at the same time allow compiler to use SSE/SSE2 unconditionally? > >> Yes, that needs to be fixed. I think the way it works on Linux makes > >> the most sense. > >> > > > > Doesn't SSE support imply SSE2+ support? > > There's no point to test OS SSE support if a compiler already > inserted SSE/SSE2 instructions everywhere (because of -msse2 switch). > > > The problem is that the OS has > > to preserve the XMMS registers when doing a context switch. Once the > > kernel is preserving the XMMS registers, I'd assume that all SSEx > > instructions should work. > > If the OS doesn't support SSE instructions but -msse2 option was used > then libFLAC will crash: it cannot disable the use of SSE/SSE2 > instructions that were generated by the compiler.
Ok, thanks for the info. Erik -- ---------------------------------------------------------------------- Erik de Castro Lopo http://www.mega-nerd.com/ _______________________________________________ flac-dev mailing list flac-dev@xiph.org http://lists.xiph.org/mailman/listinfo/flac-dev
