Richard Sandiford [rdsandif...@googlemail.com] wrote: > This pattern maps directly to __builtin_mips_prepend, which is defined > to take and return an SI type, so :SI is the correct choice here. > > I agree it might be nice to have a function that operates on 64-bit > values for 64-bit targets though. For compatibility reasons, > we'd probably have to define both a new function and a new pattern > (or at least an iterator version of the current pattern). > There's currently no way of generating PREPENDD or PREPENDW either. > > I consider this API to be owned by MTI, so we'd need to coordinate > with them. Chao-Ying, what do you think? Do you already have > something like this internally?
As there is no MIPS64 core with dsp/dspr2 in the market, we haven't tested/ported these built-in functions to MIPS64. I think it's better to keep the current prototype of __builtin_mips_prepend to return an SI type. We may need to add new built-in functions for instructions involving accumulators and for new MIPS64 dsp/dspr2 instructions to MIPS64. For existing built-in functions involving only integer registers/immediates, we may not change them. For Liu, is this solution suitable for you? Thanks! Regards, Chao-ying
