https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81709
--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> --- (In reply to Anatol from comment #4) > > you need to save the complete vector state > > It is a good point. Would it make sense for compiler to do it? Instead of > forcing users to track if SSE registers are used and doing xsave/xrstor > manually? To save and restore the complete vector state, you need to do Check if CPU supports xsave/restore if yes Query CPU for the complete vector state size Allocate space on stack for the complete vector state xsave else Allocate space on stack for the fxsave area. fxsave endif ... if CPU supports xsave/restore xrstor else fxrstor endif I don't believe compiler needs to do all that.
