SLATEC Routines --- DXADJ ---

*DECK DXADJ
      SUBROUTINE DXADJ (X, IX, IERROR)
C***BEGIN PROLOGUE  DXADJ
C***PURPOSE  To provide double-precision floating-point arithmetic
C            with an extended exponent range.
C***LIBRARY   SLATEC
C***CATEGORY  A3D
C***TYPE      DOUBLE PRECISION (XADJ-S, DXADJ-D)
C***KEYWORDS  EXTENDED-RANGE DOUBLE-PRECISION ARITHMETIC
C***AUTHOR  Lozier, Daniel W., (National Bureau of Standards)
C           Smith, John M., (NBS and George Mason University)
C***DESCRIPTION
C     DOUBLE PRECISION 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 DOUBLE-PRECISION ARITHMETIC.
C
C***SEE ALSO  DXSET
C***REFERENCES  (NONE)
C***ROUTINES CALLED  XERMSG
C***COMMON BLOCKS    DXBLK2
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  DXADJ