Re: llvm calling convention matters

On 09/11/2013 07:44 PM, Johan Tibell wrote:

On Wed, Sep 11, 2013 at 4:40 PM, Geoffrey Mainland wrote:

...

Do you mean we need a reasonable emulation of the SIMD primops for the native codegen?

Yes. Reasonable in the sense that it computes the right result. I can see that some code might still want to #ifdef (if the fallback isn't fast enough).

Two implications of this requirement: 1) There will not be SIMD in 7.8. I just don't have the time. In fact, what SIMD support is there already will have to be removed if we cannot live with LLVM-only SIMD primops. 2) If we also require interop between the LLVM back-end and the native codegen, then we cannot pass any SIMD vectors in registers---they all must be passed on the stack. My plan, as discussed with Simon PJ, is to not support SIMD primops at all with the native codegen. If there is a strong feeling that this *is not* the way to go, the I need to know ASAP. Geoff