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When some FMA set of insns is included in the base instruction set (XOP, AVX512F, and AVX512-FP16 at present), simd_test() simply invokes fma_test(), negating its return value. In case of a failure this would yield a value close to 4G, which doesn't lend itself to easy identification of the failing test case. Recognize the case in simd_check_regs() and emit alternative output identifying FMA. Signed-off-by: Jan Beulich <jbeulich@suse.com> Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>