For z/OS, the programming interface for determining if vectors are
available is
SYS1.MACLIB(CVT)
CVTVEF EQU X'80' Vector Extension Facility @NUA
This will be on when you are on at least z/OS 2.1, and this bit is on:
BROWSE SYS1.MACLIB(IHAFACL)
Facl_VectorExtensionFacility EQU X'40' Bit 129. z13 Even if this bit *
is on, do not use the VEF unless *
bit CVTVEF is on.
Jim Mulder z/OS Diagnosis, Design, Development, Test IBM Corp.
Poughkeepsie NY
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