[PATCH] D37957: [TableGen] Some simple optimizations to TableGen execution time

[Krzysztof Parzyszek via Phabricator via llvm-commits]

kparzysz added a comment.

In https://reviews.llvm.org/D37957#875513, @zturner wrote:

> Can you apply this patch Krzysztof and see if you can figure out what the right thing to do is with the empty `StringRef`?


It's because of this pattern that doesn't have any named variables (i.e. all names of leaf values are empty):
`(intrinsic_void 5755:{ *:[iPTR] }, ECX:{ *:[i32] }, EAX:{ *:[i32] }, EBX:{ *:[i32] })`

It corresponds to this pattern in .td, in case anyone's interested:

  let Uses = [ ECX, EAX, EBX ] in {
    def MWAITXrrr : I<0x01, MRM_FB, (outs), (ins), "mwaitx",
                    [(int_x86_mwaitx ECX, EAX, EBX)], IIC_SSE_MWAITX>,
                    TB, Requires<[ HasMWAITX ]>;
  }


https://reviews.llvm.org/D37957