PowerPC: Check for VSX and power8 arch for enabling altivec implementations #619
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This PR adds more checks of C macro for enabling the altivec implementations of shuffle and bitshuffle.
Indeed checking
__ALTIVEC__is not enough (see #592 for details).I tested this as part of
hdf5plugin(see silx-kit/hdf5plugin#307 (comment)).Checking only
__VSX__was not enough since some features were added over time and I had issue compiling with-mcpu=power7.Really not sure it is the best approach, but it looks to work for what I tested.
attn @barracuda156 @kif