EFFECTS OF OPTIONS ON FORTRAN DECLARATIONS

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IBM XLF Compiler

Bytes of Storage Allocated and Used for a Scalar Variable of a Given Type
when a Specified Compiler Option is Used
  default or -qautodbl or -qautodbl=none or -qrealsize=4 -qrealsize=8 -qautodbl= dbl4 or
-qautodbl= dblpad4
-qautodbl= dbl8 or
-qautodbl= dblpad8
-qautodbl= dbl
REAL 4 8 8 4 8
DOUBLE PRECISION 8 16 8 16 16
COMPLEX 8 16 16 8 16
DOUBLE COMPLEX 16 32 16 32 32
REAL*4 or
REAL(4) or
REAL(KIND=4)
4 4 8 4 8
REAL*8 or
REAL(8) or
REAL(KIND=8)
8 8 8 16 16
REAL*16 or
REAL(16) or
REAL(KIND=16)
16 16 16 16 16
COMPLEX*8 or
COMPLEX(4) or
COMPLEX(KIND=4)
8 8 16 8 16
COMPLEX*16 or
COMPLEX(8) or
COMPLEX(KIND=8)
16 16 16 32 32
COMPLEX*32 or
COMPLEX(16) or
COMPLEX(KIND=16)
32 32 32 32 32
INTEGER or
LOGICAL
No Effect