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[AIE2] Support for 64-bit G_BUILD_VECTOR and G_UNMERGE_VALUES #77

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Implements support for 64-bit vector creation and unmerging for AIE2 by extending the code for the 32-bit case. This will create mildly funky GMIR code since the rest of the legalizer splits 64-bit down into 32-bit numbers, but this all gets untangled later in the pipeline into nice(r) IR.

@ValentijnvdBeek ValentijnvdBeek force-pushed the vvandebe.vector.build.unmerge.64 branch from d65813c to 226d716 Compare June 25, 2024 10:07
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backend:aie2 enhancement New feature or request llvm:globalisel Code that modifies the Global Intruction Selection vectorization Support for vector instructions
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