SLABAD takes as input the values computed by SLAMCH for underflow and


 overflow, and returns the square root of each of these values if the


 log of LARGE is sufficiently large.  This subroutine is intended to


 identify machines with a large exponent range, such as the Crays, and


 redefine the underflow and overflow limits to be the square roots of


 the values computed by SLAMCH.  This subroutine is needed because


 SLAMCH does not compensate for poor arithmetic in the upper half of


 the exponent range, as is found on a Cray.

SMALL

          SMALL is REAL


          On entry, the underflow threshold as computed by SLAMCH.


          On exit, if LOG10(LARGE) is sufficiently large, the square


          root of SMALL, otherwise unchanged.

LARGE

          LARGE is REAL


          On entry, the overflow threshold as computed by SLAMCH.


          On exit, if LOG10(LARGE) is sufficiently large, the square


          root of LARGE, otherwise unchanged.

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NAG Ltd.

November 2011