>>> On 16.10.17 at 17:05, <george.dun...@citrix.com> wrote: > On 10/16/2017 01:32 PM, Jan Beulich wrote: >> Since the emulator acts on the live hardware registers, we need to >> prevent the compiler from using them e.g. for inlined memcpy() / >> memset() (as gcc7 does). > > Why doesn't this affect the rest of the hypervisor too, since we don't > save and restore the *mm registers?
Because we build the hypervisor with -mno-sse. >> We can't, however, set this from the command >> line, as otherwise the 64-bit build would face issues with functions >> returning floating point values and being declared in standard headers. > > Sorry, just to clarify: You mean that there are standard headers which > contain prototypes for functions which return floating point values; we > include those headers but do not call the functions; and adding the > #pragma to the command-line would cause the compiler to choke on the > prototypes (even though the functions are never actually called)? Yes (adding the command line option equivalent of the pragma, that is). Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
