The NOVECTOR directive tells the compiler not to vectorize the DO loop following the directive. This is useful in cases where the vectorized form would not perform as well as the scalar form. The NOVECTOR directive takes the following form:

cDEC$ NOVECTOR

c

Is the letter or character that introduces the directive tag (see Section 11.1).

The NOVECTOR directive must precede the DO statement for each DO loop to which you want the directive to apply. No source code lines, other than the following, can be placed between the NOVECTOR directive statement and the DO statement:

• An optional DO_PARALLEL parallel directive

• An INIT_DEP_FWD general directive

• Placeholder lines

• Comment lines

• Blank lines