On Mon, 18 Oct 2010, Ira Rosen wrote: > > > Does that mean that the vectorizer will be aware of specific > instructions? > > > > I would imagine that it would need to know what permutations are > > available, yes (GIMPLE and RTL would have some form of general permuting > > load/store operation, which the vectorizer would only generate where > > relevant instructions exist for the chosen permutation). > > So, there will be a new tree code, e.g. PERM_LOAD_EXPR, and the vectorizer > will use it for misaligned loads in big endian (or maybe for little endian > as well), and for strided loads. The vectorizer will check if the > instruction is supported giving the desired stride (1,2,3) as input, and > will receive a mask. It will use the mask in order to permute all other > relevant vectors (like vectors of constants) if necessary, making all the > generic GIMPLE and RTL correct. And later, when assembly code is generated, > everything should be permuted again?
Yes, something like that. -- Joseph S. Myers jos...@codesourcery.com _______________________________________________ linaro-toolchain mailing list linaro-toolchain@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-toolchain
