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[AIEX] Add a combiners to optimize unaligned vector loads #698

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[AIEX] Add a combiners to optimize unaligned vector loads #698

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c6d6d3e
[AIEX] Add a combiner to handle extract from unaligned vector load
andcarminati Nov 5, 2025
bd80000
[AIEX] Add a combiner to change vector load element type based on ali…
andcarminati Nov 12, 2025
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17 changes: 15 additions & 2 deletions llvm/lib/Target/AIE/AIECombine.td
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Original file line number Diff line number Diff line change
Expand Up @@ -252,6 +252,18 @@ def combine_trunc_load : GICombineRule<
[{ return matchNarrowTruncLoad(*${root}, MRI, Helper, Observer, ${matchinfo}); }]),
(apply [{ Helper.applyBuildFnNoErase(*${root}, ${matchinfo}); }])>;

def combine_unaligned_extract_load : GICombineRule<
(defs root:$root, build_fn_matchinfo:$matchinfo),
(match (wip_match_opcode G_EXTRACT_VECTOR_ELT, G_AIE_ZEXT_EXTRACT_VECTOR_ELT, G_AIE_SEXT_EXTRACT_VECTOR_ELT): $root,
[{ return matchUnalignedExtractLoad(*${root}, MRI, Observer, ${matchinfo}); }]),
(apply [{ Helper.applyBuildFnNoErase(*${root}, ${matchinfo}); }])>;

def combine_unaligned_vector_load : GICombineRule<
(defs root:$root, build_fn_matchinfo:$matchinfo),
(match (wip_match_opcode G_LOAD): $root,
[{ return matchUnalignedVectorLoad(*${root}, MRI, Observer, ${matchinfo}); }]),
(apply [{ Helper.applyBuildFn(*${root}, ${matchinfo}); }])>;

// AIE-specifc combines (currently shared by AIE2 and AIE2P).
def aie_additional_combines : GICombineGroup<[
combine_unpad_vector,
Expand All @@ -274,7 +286,9 @@ def aie_additional_combines : GICombineGroup<[
combine_align_memset,
combine_peel_memset,
combine_pack_stores_into_memset,
combine_trunc_load
combine_trunc_load,
combine_unaligned_extract_load,
combine_unaligned_vector_load
]>;

// AIE2P-specific combines.
Expand Down Expand Up @@ -408,4 +422,3 @@ def AIE2PPostLegalizerCustomCombiner
combine_add_vector_elt_undef,
]> {
}

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