March Comes In

Since the last day of the third month of 2026 is only three days away, you may be hearing with greater frequency a familiar saying. According to Google AI Overview: "'March comes in like a lion, out ...

Yahoo: 'March comes in like a lion and goes out like a lamb'-but does it really?

'March comes in like a lion and goes out like a lamb'-but does it really?

You've likely heard the saying, "March comes in like a lion and out like a lamb," so it should come as no surprise that some of history's most celebrated authors were dually captivated with the beauty ...

In some other places, March might indeed come in like a lion and go out like a lamb. In Florida? March comes in like a nesting sea turtle and goes out like a napping alligator. Or maybe in like a ...

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 ...

As far as I know, the compilation option for MSVC that tells the compiler to use special available instruction is /arch. On clang/linux, we can use -march=native to automatically detect the archite...