CEESxLG2—Logarithm base 2

CEESxLG2 performs the mathematical function logarithm base 2 by using the equation:

The following routines are provided for the various data types supported:

CEESSLG2: 32-bit single floating-point number
CEESDLG2: 64-bit double floating-point number
CEESQLG2: 128-bit extended floating-point number


Syntax

>>-CEESxLG2--(--parm1--,--fc--,--result--)---------------------><

parm1 (input)

The input to the log base 2 routine. The input range is: parm1 > 0.

fc (output)

A 12-byte feedback code, optional in some languages, that indicates the result of this service. If you choose to omit this parameter, refer to Invoking callable services for the appropriate syntax to indicate that the feedback code was omitted.

The following symbolic conditions can result from this service:

Code	Severity	Message number	Message text
CEE000	0	—	The service completed successfully.
CEE1US	2	2012	The parameter was less than or equal to `limit` in math routine `routine-name`.

result (output)

The result of the log base 2 routine. The output range is: result is greater than or equal to -260 and is less than or equal to 252.