[WIP][LinalgExt] Support iree_linalg_ext.index in attention ops for causal masks#24056
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… masking Express causal masking via iree_linalg_ext.index in the attention region body instead of an is_causal attribute. Teach decomposition to remap index ops to linalg.index via sMap, and tiling to apply offsets. Detect causal masks during TMTensor conversion via the is_causal attribute from llvm/torch-mlir#4520. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> Signed-off-by: Keshav Vinayak Jha <keshavvinayakjha@gmail.com>
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Express causal masking via iree_linalg_ext.index in the attention region body instead of an is_causal attribute. Decomposition remaps index ops to linalg.index via sMap, and tiling uses.offsets.
Aided by the addition of
is_causalto theTMTensor::AttentionOpin llvm/torch-mlir#4520.