-mgeneral-regs-only on x86?

[dgruss]

Should we use -mgeneral-regs-only somewhere just to be sure?

[Ferdi265]

especially if students enable optimizations at some point, it can happen that some of the instruction set extension flags (-msse and friends) are not set, and gcc will try to use that to vectorize code.

if that happens in userspace, fun things happen at/around context switches.

so yes, -mgeneral-regs-only seems reasonable as long as SWEB has no support for saving/restoring floating point state.

[dgruss]

We do support FPU in userspace, so at least older SSE versions should work...

[Woazboat]

Relevant issue: #223

[dgruss]

already implemented