https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71659
--- Comment #3 from Jeffrey Walton <noloader at gmail dot com> --- (In reply to postmaster from comment #2) > Portability is one main reason to add missing intrinsics... with combination > of cpuid check and _xgetbv() we can cleanly check if AVX or MPX is available > at run-time. We can also check specific instructions during configure > process to see if we need to add workarounds for bad or missing > functions/intrinsics. +1. We were trying to use Intel's algorithm described at https://software.intel.com/en-us/blogs/2011/04/14/is-avx-enabled . We should only need __get_cpuid and _xgetbv. We should not need that nasty GCC inline assembly.
