Re: [Qemu-devel] [PATCH v3 3/4] softfloat: use floatx80_infinity in softfloat

[Richard Henderson]

On 02/23/2018 06:59 AM, Laurent Vivier wrote:
> @@ -4550,8 +4556,8 @@ int64_t floatx80_to_int64(floatx80 a, float_status 
> *status)
>          if ( shiftCount ) {
>              float_raise(float_flag_invalid, status);
>              if (    ! aSign
> -                 || (    ( aExp == 0x7FFF )
> -                      && ( aSig != LIT64( 0x8000000000000000 ) ) )
> +                 || ((aExp == floatx80_infinity_high)
> +                     && (aSig != floatx80_infinity_low))
>                 ) {

As long as you're cleaning this up, m68k ignores the explicit integer bit when
considering an infinity.  However, Intel doesn't ignore the bit -- it appears
to treat 7fff.0* as a NaN.


r~