[PD-dev] pvoc example and rsqrt~

Hi Miller, hi all,

i came across a strange thing when testing the Altivec SIMD implementation with my favorite example, namely 04.fft/09.pvoc.pd . It seems that the phase propagation is dependent on the fact that rsqrt~ (0) delivers a valid non-zero value of about 1.e+19. (well, which non-zero value is irrelevant) If rsqrt~ (0) = 0, which would make more sense to me (given the zero checks in /~ ) the example is silent. (what almost drove me nuts, btw. )

Although i already asked before, i'd be interested about the common behaviour of objects that are endangered to deliver NANs. Should these cases always be trapped and bashed to zero? To know that would help me a lot with the proper SIMD implementation.

best greetings, Thomas