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Yahoo Sports: What to know about Tennessee basketball heading into March Madness

Yahoo Sports: March Madness bracket picks: Best Cinderella upset predictions and sleepers for men's NCAA tournament

It’s time to fill out your bracket, and what's March without a little madness in the form of some Cinderella teams to root for along the way? Yahoo Sports’ Scott Pianowski rev ...

For The Win: 4 March Madness prospects with rising draft stock before Sweet 16

The Columbus Dispatch: March Madness first round predictions: NCAA bracket picks for every men’s game

March Madness first round predictions: NCAA bracket picks for every men’s game

March Madness bracket picks: Best Cinderella upset predictions and sleepers for men's NCAA tournament

For -O0, whether -march=native or -march= is the default still specifies the same family, so both are perfectly compatibly with -O0; and whenever another optimization level is specified, -march=native is beneficial to performance. So, for me, the fact that -O0 is the default doesn't matter for -march 's default.

As I understand it, -march=native will detect the ISA and extensions to use from cpuid (which include model, family and stepping information). -march=xxx will use a baseline set of extensions and a baseline ISA. There are a lot of possible combinations of extensions, so only the most relevant were chosen (e.g. skylake-avx512 was added to reflect an important extension of some skylakes). -march ...

-march=foo implies -mtune=foo unless you also specify a different -mtune. This is one reason why using -march is better than just enabling options like -mavx without doing anything about tuning. Caveat: -march=native on a CPU that GCC doesn't specifically recognize will still enable new instruction sets that GCC can detect, but will leave -mtune=generic. Use a new enough GCC that knows about ...