------- Comment #12 from hjl dot tools at gmail dot com 2008-11-22 15:15 ------- Richard asked:
Why should it (-mavx -msse5) be disallowed if a user asks for it? Do we disallow -msse4a -mssse4? Reply: -msse4a -mssse4 can generate code which runs if you check the feature bit in CPUID before calling an appropriate function. But -mavx -msse5 will generate codes which won't run on any machines. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38201
