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Summary: Related to D75672, this patch adds EVT::isFixedLengthVector to determine if the underlying vector type is of fixed length. An assert is introduced in EVT::getVectorNumElements that triggers for types that aren't fixed length. This is currently guarded by a flag added D75297 that is off by default and has been renamed to the more generic ENABLE_STRICT_FIXED_SIZE_VECTORS. Ideally we want to get rid of getVectorNumElements but a quick grep shows there are >350 uses in lib/CodeGen and 75 in lib/Target/AArch64 alone. All of these probably aren't EVT::getVectorNumElements (some may be the MVT equivalent), but there are many places to fixup and having the assert on by default would make the SVE upstreaming effort difficult. Reviewers: sdesmalen, efriedma, ctetreau, huntergr, rengolin Reviewed By: efriedma Subscribers: mgorny, kristof.beyls, hiraditya, danielkiss, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D76376
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