> > I think, like Ian, that conversions from V4SF to V4SI, via an ordinary > cast, should perform a conversion; this should be the same as converting > each of the individual floats to int. Then, since the bit-preserving > conversion is also useful, we should have another syntax for that. > > However, the Altivec situation, coupled with the fact that > bit-preserving conversion is our current behavior, makes me think that, > what I might think the ideal language-design ought to be may have little > relevance. Do people think it's viable to change the default kind of > conversion, on targets other than Altivec?
As I mentioned, SSE code already depends on the current behavior and in fact seems like a better behavior than actually changing the bits. The RFC for converting scalar literals to vectors (bit preserving) was: http://gcc.gnu.org/ml/gcc/2003-06/msg00158.html And the last time this was brought up was: http://gcc.gnu.org/ml/gcc/2004-09/msg00003.html And there was no change then, why change now and since generic vector support has been there since at least 3.4 with a lot of the bugs flushed out in 4.0.x. -- Pinski
