3 ms·

> Don't CPU compilers in general, not just ARM ones, avoid using FMA for normal arithmetic unless you use -ffast-math? Doesn't seem o be the case: MSVC avoids

by qayxc 5y ago

> Don't CPU compilers in general, not just ARM ones, avoid using FMA for normal arithmetic unless you use -ffast-math? Doesn't seem o be the case: MSVC avoids FMA, while GCC prefers it: https://godbolt.org/z/e9EcfjdeY https://godbolt.org/z/e9EcfjdeY

fulafel 5y ago
Your link uses -ffast-math with gcc.
- qayxc 5y ago
  The result stays more or less the same without it, still using FMA: https://godbolt.org/z/6MWcahsfo https://godbolt.org/z/6MWcahsfo