# xadj.f

          SUBROUTINE XADJ (X, IX, IERROR)
    C***BEGIN PROLOGUE  XADJ
    C***PURPOSE  To provide single-precision floating-point arithmetic
    C            with an extended exponent range.
    C***LIBRARY   SLATEC
    C***CATEGORY  A3D
    C***TYPE      SINGLE PRECISION (XADJ-S, DXADJ-D)
    C***KEYWORDS  EXTENDED-RANGE SINGLE-PRECISION ARITHMETIC
    C***AUTHOR  Lozier, Daniel W., (National Bureau of Standards)
    C           Smith, John M., (NBS and George Mason University)
    C***DESCRIPTION
    C     REAL X
    C     INTEGER IX
    C
    C                  TRANSFORMS (X,IX) SO THAT
    C                  RADIX**(-L) .LE. ABS(X) .LT. RADIX**L.
    C                  ON MOST COMPUTERS THIS TRANSFORMATION DOES
    C                  NOT CHANGE THE MANTISSA OF X PROVIDED RADIX IS
    C                  THE NUMBER BASE OF SINGLE-PRECISION ARITHMETIC.
    C
    C***SEE ALSO  XSET
    C***REFERENCES  (NONE)
    C***ROUTINES CALLED  XERMSG
    C***COMMON BLOCKS    XBLK2
    C***REVISION HISTORY  (YYMMDD)
    C   820712  DATE WRITTEN
    C   881020  Revised to meet SLATEC CML recommendations.  (DWL and JMS)
    C   901019  Revisions to prologue.  (DWL and WRB)
    C   901106  Changed all specific intrinsics to generic.  (WRB)
    C           Corrected order of sections in prologue and added TYPE
    C           section.  (WRB)
    C           CALLs to XERROR changed to CALLs to XERMSG.  (WRB)
    C   920127  Revised PURPOSE section of prologue.  (DWL)
    C***END PROLOGUE  XADJ