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/GNU Fortran 10

7.2.6 NOVECTOR directive

The syntax of the directive is

!GCC$ novector

This directive tells the compiler to not vectorize the following loop. It must be placed immediately before a DO loop and applies only to the loop that follows.

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https://gcc.gnu.org/onlinedocs/gcc-10.2.0/gfortran/NOVECTOR-directive.html