"gcc -march=bdver2 -Q --help=target" reports: -mavx [disabled] When the extension is supported by the microarchitecture.
It is enabled: {"bdver2", PROCESSOR_BDVER2, CPU_BDVER2, PTA_64BIT | PTA_MMX | PTA_SSE | PTA_SSE2 | PTA_SSE3 | PTA_SSE4A | PTA_CX16 | PTA_ABM | PTA_SSSE3 | PTA_SSE4_1 | PTA_SSE4_2 | PTA_AES | PTA_PCLMUL | PTA_AVX | PTA_FMA4 | PTA_XOP | PTA_LWP | PTA_BMI | PTA_TBM | PTA_F16C | PTA_FMA | PTA_PRFCHW | PTA_FXSR | PTA_XSAVE},
I don't why sometimes it shows up as enabled and other times it does not.