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matchvectorshuffle
2009 May 01
0
[LLVMdev] RFC: AVX Pattern Specification [LONG]
...Nate is currently working on refactoring a bunch of shuffle related
logic, which includes changing the X86 backend to canonicalize
shuffles more like the ppc/altivec backend does. Once that is done, I
think it would make sense for tblgen to generate some C++ code that
looks like this:
// MatchVectorShuffle - Matches a shuffle node against the available
instructions,
// returning the lowest cost one as well as the actual cost of it.
unsigned MatchVectorShuffle(VectorShuffleSDNode *N) {
unsigned LowestCost = ~0;
if (N can be matched by movddup) {
unsigned movddupcost = ... // can be eit...
2009 May 01
4
[LLVMdev] RFC: AVX Pattern Specification [LONG]
On Friday 01 May 2009 13:46, Chris Lattner wrote:
> Right, a lot of these problems can be solved by some nice refactoring
> stuff. I'm also hoping that some of the complexity in defining
> shuffle matching code can be helped by making the definition of the
> shuffle patterns more declarative within the td file. It would be
> really nice to say that "this shuffle does a