Directly check altivec macro. #2002
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Prior to this PR, we assumed that all 64-bit POWER processors supported altivec (vector instructions). It seems that some 64-bit POWER systems lack support for altivec...
Indeed, even after including
<altivec.h>, we may have that the keyword__vectorremains unrecognized. Yet this is textbook code (see https://en.wikipedia.org/wiki/AltiVec).This PR adds an additional test.
Fixes #2000