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/ANSI_ALIAS

    /ANSI_ALIAS
    /NOANSI_ALIAS (D)

 Directs the compiler to assume the ANSI C aliasing rules, thus
 giving it the freedom to generate better optimized code.

 The aliasing rules are explained in Section 3.3, paragraphs 20 and
 25 of the ANSI C Standard.

 The default is /NOANSI_ALIAS for the /STANDARD=VAXC and
 /STANDARD=COMMON compiler modes.  The default is /ANSI_ALIAS for
 all other modes.