Ask takes 79s to compile / 4300+ lines long

This is with TensorFlow at commit 80768cb23a3a4314c52af0b48a6bcf23ca541e19. The file tensorflow/compiler/mlir/tensorflow/ir/ is about 4300 lines long and takes nearly 79s by itself to compile on a fast workstation (Intel Skylake-based Core i7 8700K 3.70GHz) with a typical bazel config below. It'll be great to split this file into two.

bazel build --linkopt="-fuse-ld=lld" -j 11    //tensorflow/compiler/mlir:tf-opt
gcc (GCC) 9.3.1 20200408 (Red Hat 9.3.1-2)
On an Fedora Core 31 x86-64 Linux, Intel Core i7 8700K 3.70 GHz, 32 GB DDR4 RAM.
INFO: Analyzed target //tensorflow/compiler/mlir:tf-opt (0 packages loaded, 0 targets configured).
INFO: Found 1 target...
Target //tensorflow/compiler/mlir:tf-opt up-to-date:
INFO: Elapsed time: 79.099s, Critical Path: 78.93s
INFO: 2 processes: 2 local.
INFO: Build completed successfully, 3 total actions

To reproduce, please change and rebuild tf-opt as shown above. The linkopt shouldn't make a difference here.


Answer questions jpienaar

@bondhugula could you see if the recent change has improved this?


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