[Gc] Small fix for AO_compiler_barrier (for VC++)

Ivan Maidanski ivmai at mail.ru
Fri May 15 09:29:15 PDT 2009


"intrin.h" is included before using _ReadWriteBarrier (only for VC++). It happens that "intrin.h" is not needed here if "-O" compiler switch is used.

In fact, this fix is for my patch "diff29":

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