Allow Layouts to propogate to local_load (#5219) (#5249)

recommit of triton-lang/triton#5219

While working on some higher dimension tensor kernels, I noticed poor
performance due to the fact that layouts wouldn't propagate to local
loads. Since we do allow layout folding with local store and local
alloc, this seems like a bit of an oversight.

The change gives a 40% speed improvement on certain kernels for NVidia
GPUs.

This also removes asserts in lowering for higher dimensional kernels. As
far as I can tell, those restrictions aren't required in practice.


# New contributor declaration
- [x] I am not making a trivial change, such as fixing a typo in a
comment.
- [x] I have written a PR description following these
[rules](https://cbea.ms/git-commit/#why-not-how).
- [x] I have run `pre-commit run --from-ref origin/main --to-ref HEAD`.
- [x] I have added tests.
- [x] The `lit` tests I have added follow these [best
practices](https://mlir.llvm.org/getting_started/TestingGuide/#filecheck-best-practices)

<!---
The core Triton is a small number of people, and we receive many PRs
(thank
you!).  To help us review your code more quickly, **if you are a new
contributor (less than 3 PRs merged) we ask that you complete the
following
tasks and include the filled-out checklist in your PR description.**

Complete the following tasks before sending your PR, and replace `[ ]`
with
`[x]` to indicate you have done them.
-->

# New contributor declaration
- [ ] I am not making a trivial change, such as fixing a typo in a
comment.

- [ ] I have written a PR description following these
  [rules](https://cbea.ms/git-commit/#why-not-how).

- [ ] I have run `pre-commit run --from-ref origin/main --to-ref HEAD`.

- Select one of the following.
  - [ ] I have added tests.
    - `/test` for `lit` tests
    - `/unittest` for C++ tests
    - `/python/test` for end-to-end tests
  - [ ] This PR does not need a test because `FILL THIS IN`.

- Select one of the following.
  - [ ] I have not added any `lit` tests.
- [ ] The `lit` tests I have added follow these [best
practices](https://mlir.llvm.org/getting_started/TestingGuide/#filecheck-best-practices),
including the "tests should be minimal" section. (Usually running Python
code
    and using the instructions it generates is not minimal.)

Co-authored-by: Matthew Brookhart <[email protected]>

Author: ThomasRaoux

lib/Dialect/TritonGPU/Transforms/Utility.cpp

@@ -563,7 +563,8 @@ bool canFoldIntoConversion(Operation *op, Attribute targetEncoding) {
   }
   return isa<triton::gpu::ConvertLayoutOp, arith::ConstantOp,
              triton::MakeRangeOp, triton::SplatOp, triton::HistogramOp,
-             triton::gpu::LocalAllocOp, triton::gpu::LocalStoreOp>(op);
+             triton::gpu::LocalAllocOp, triton::gpu::LocalLoadOp,
+             triton::gpu::LocalStoreOp>(op);
 }
 
 scf::ForOp replaceForOpWithNewSignature(

test/TritonGPU/combine.mlir

@@ -2685,3 +2685,21 @@ module attributes {"triton_gpu.num-warps" = 1 : i32, "triton_gpu.threads-per-war
     tt.return
   }
 }
+
+// -----
+
+#blocked = #triton_gpu.blocked<{sizePerThread = [1, 1, 1, 1, 4], threadsPerWarp = [2, 1, 16, 1, 1], warpsPerCTA = [1, 1, 2, 2, 1], order = [4, 0, 1, 2, 3]}>
+#blocked2 = #triton_gpu.blocked<{sizePerThread = [1, 1, 1, 1, 4], threadsPerWarp = [1, 1, 32, 1, 1], warpsPerCTA = [1, 1, 1, 1, 4], order = [4, 3, 2, 1, 0]}>
+#blocked1 = #triton_gpu.blocked<{sizePerThread = [1, 1, 1, 1, 4], threadsPerWarp = [2, 1, 16, 1, 1], warpsPerCTA = [1, 2, 2, 1, 1], order = [4, 0, 3, 2, 1]}>
+#shared = #triton_gpu.shared<{vec = 1, perPhase = 1, maxPhase = 1, order = [4, 0, 1, 2, 3], hasLeadingOffset = false}>
+module attributes {"triton_gpu.num-ctas" = 1 : i32, "triton_gpu.num-warps" = 4 : i32, triton_gpu.target = "cuda:100", "triton_gpu.threads-per-warp" = 32 : i32} {
+  // CHECK-LABEL: lift_convert_to_local_load
+  // CHECK-NOT: convert_layout
+  // CHECK: tt.return
+  tt.func public @lift_convert_to_local_load(%arg0 : !triton_gpu.memdesc<2x1x32x4x4xi8, #shared, #triton_gpu.shared_memory, mutable>) -> tensor<2x4x32x1x4xi8, #blocked2> {
+    %1 = triton_gpu.local_load %arg0 : !triton_gpu.memdesc<2x1x32x4x4xi8, #shared, #triton_gpu.shared_memory, mutable> -> tensor<2x1x32x4x4xi8, #blocked>
+    %2 = tt.trans %1 {order = array<i32: 0, 3, 2, 1, 4>} : tensor<2x1x32x4x4xi8, #blocked> -> tensor<2x4x32x1x4xi8, #blocked1>
+    %3 = triton_gpu.convert_layout %2 : tensor<2x4x32x1x4xi8, #blocked1> -> tensor<2x4x32x1x4xi8, #blocked2>
+    tt.return %3 : tensor<2x4x32x1x4xi8, #blocked2>
+  }
+}