Re: [PATCH][4.3] Expand lround inline for x86_64/i?86 SSE math

[Geert Bosch <bosch at adacore dot com>]

On Oct 18, 2006, at 12:22, Richard Guenther wrote:

> which would be fine (as we can restrict the inline expansion to
> -fno-rounding-math then, which is the default).  Now on to a way
> to tell real.c to do nextafter (0.5, 0.0) ...

You can lift that code from ada/trans.c:

      /* Compute the exact value calc_type'Pred (0.5) at compile  
time. */
      fmt = REAL_MODE_FORMAT (TYPE_MODE (calc_type));
      real_2expN (&half_minus_pred_half, -(fmt->p) - 1);
      REAL_ARITHMETIC (pred_half, MINUS_EXPR, dconsthalf,
                       half_minus_pred_half);
      gnu_pred_half = build_real (calc_type, pred_half);

  -Geert