math: Set fenv exceptions for several Neon routines
In most cases, we mask lanes which should not trigger exceptions with
a neutral value, then let the existing special-case handler fix them
up later. For exp and exp2 we replace the more complex special-case
handler with a simple scalar fallback. All new behaviour is tested in
runulp.sh, with a new option to pass -f to the run line. We also
extend the fenv testing to Neon log and logf, which already triggered
exceptions correctly. New behaviour is mostly hidden behind a new
config setting, WANT_SIMD_EXCEPT.
11 files changed