[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] fma4/avx under xen
Hi I wanted to bring this to your attention https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/956051 The summary is that when gcc compiles something with -mfma4 it also enables the use of the avx instruction set. Since by default xen disables avx it leads to invalid opcodes. This ends up being kinda nasty with the multiarch glibc since its doing stuff like (HAS_FMA4 ? run_fma4_func() : (HAS_AVX ? run_avx_func() : run_func())) run_fma4_func() can end up bombing out from the invalid opcode when run under xen. Its not clear to me if xen should be filtering fma4 as part of its avx filter or if gcc should not assume avx support when compiling with -mfma4. thoughts? thanks jim _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
|
Lists.xenproject.org is hosted with RackSpace, monitoring our |