On 07/12/2011 10:07 AM, Rainer Orth wrote:
> Only a couple of special defines (like FLOAT_WORD_ORDER_MISMATCH,
> QUIET_NAN_NEGATED) are moved to special t-* files in libgcc/config with
> [FDT]PBIT_CFLAGS similar to e.g. LIBGCC_SYNC_CFLAGS. If it were
> possible to have gcc define some __LIBGCC_* macro corresponding to them,
> that would allow for further simplification. Only if this mechanism
> couldn't handle the requirements have I resorted to introducing
> libgcc_tm_file snippets to handle them.
Re QUIET_NAN_NEGATED, it seems like we should be able to make use
of the __builtin_nan("") function.
Perhaps
if (isnan (src))
{
FLO_type ret = __builtin_nan("");
if (sign)
ret = -ret;
return ret;
}
... assuming __builtin_nan gets re-defined in fp-bit for the type
as appropriate.
r~
