Commit a53ef0f
authored
Set stride info for output type when lowering make_blk_ptr from TTIR to MLIR (#245)
When tensors are represented using make_block_ptr in Triton, during the
TTIR to MLIR lowering process, the stride information of the output
resulting from memref.reinterpret_cast is dynamic. Although the shape
and access information are known at compile time, some dynamic
information is still being generated.
```
# Triton code
in_block_ptr = tl.make_block_ptr(
base=x_ptr,
shape=(B, H, W, D),
strides=(H * W * D, W * D, D, 1),
offsets=(0, 0, 0, 0),
block_shape=(B, H, W, D),
order=(3, 2, 1, 0),
)
```
```
# MLIR code
%reinterpret_cast = memref.reinterpret_cast %arg0 to offset: [%c0], sizes: [4, 2, 2, 128], strides: [%c512, %c256, %c128, %c1] : memref<xf16> to memref<4x2x2x128xf16, strided<[?, ?, ?, ?], offset: ?>>
```
IIf the first instance of MLIR code contains dynamic stride information
inside memref.reinterpret_cast, the lowering pipeline generates code
assuming the stride information is unknown. Consequently, the resulting
code gets scalarized at some stage of the pipeline. The changes in this
PR allow us to set stride information when converting TTIR code to MLIR
code, ensuring the availability of stride information in the first
instance of MLIR code. These changes enable us to generate vector code
when using make_blk_ptr.1 parent 19fb6f3 commit a53ef0f
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- lib/Conversion/StructuredToMemref
- test/Conversion/StructuredToMemref
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