[AMD] CanonicalizePointers: Handle different base pointers and offset…#935
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triton-lang#9541) `scf.if` and `arith.select` ops can have different base pointers accross branches. In that case, `FatPtrAttrs` can't keep `smallTensorBase` or pick one of the branches. Instead, replace `smallTensorBase` (Value) with `isSmallTensor` (bool) in `FatPtrAttrs` and add a conservative `merge` function for combining attrs. Also, handle different scalar offsets properly when handling `arith.select` ops.
antiagainst
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Mar 31, 2026
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Cherry-pick of triton-lang#9541 to 3.6 for buffer ops bug fix.
Applies cleanly.