https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121853
--- Comment #2 from Arne Juul <arnej at pvv dot ntnu.no> ---
emitting a "call __extendbfsf2" is bad no matter how efficient it's
implemented.
Looking at the gcc sources it's clear to me that the problem is in gcc/expr.cc
where the following code:
if (to_mode == SFmode
&& !HONOR_NANS (from_mode)
&& !HONOR_NANS (to_mode)
&& optimize_insn_for_speed_p ())
{
/* If we don't expect sNaNs, for BFmode -> SFmode we can just
shift the bits up. */
should use HONOR_SNANS instead, the comment even explains why.
