SLABAD is a no-op and kept for compatibility reasons. It used
 to correct the overflow/underflow behavior of machines that
 are not IEEE-754 compliant.

SMALL

          SMALL is REAL
          On entry, the underflow threshold as computed by SLAMCH.
          On exit, the unchanged value SMALL.

LARGE

          LARGE is REAL
          On entry, the overflow threshold as computed by SLAMCH.
          On exit, the unchanged value LARGE.

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