tree a3a200325a1c98dac66042c8958975bfb4fab0b3
parent 764b4bfb2b6faa2c38edebf0895aff1f7cf972a2
author Szabolcs Nagy <szabolcs.nagy@arm.com> 1528792948 +0100
committer Szabolcs Nagy <szabolcs.nagy@arm.com> 1528793321 +0100

More portable default setting for HAVE_FAST_FMA

FP_FAST_FMA is the standard way to decide if fma is fast, unfortunately
in practice it can be defined even if fma is not inlined (e.g. with
-fno-builtin-fma), and it does not really help if the libc has a single
instruction implementation: the call overhead is too much.  Most of the
time it is the correct check though and without configure time checks
this is the closest we can get.