SLABAD(3F)SLABAD(3F)NAMESLABAD - take 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
SYNOPSIS
SUBROUTINE SLABAD( SMALL, LARGE )
REAL LARGE, SMALL
PURPOSESLABAD 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.
ARGUMENTS
SMALL (input/output) 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 (input/output) 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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