[middle-end,patch] Making __builtin_signbit type-generic

[Andreas Schwab]

FX <fxcoudert@gmail.com> writes:

> @@ -80,6 +80,24 @@ foo_1 (float f, double d, long double ld
>    if (__builtin_finitel (ld) != res_isfin)
>      __builtin_abort ();
>  
> +  /* Sign bit of zeros and nans is not preserved in unsafe math mode.  */
> +#ifdef UNSAFE
> +  if (!res_isnan && d != 0)
> +#endif

Why only in usafe mode?  Isn't the sign bit of NaN always unreliable?

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
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