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authorLuke Lau <luke@igalia.com>2023-09-21 13:55:49 +0100
committerGitHub <noreply@github.com>2023-09-21 13:55:49 +0100
commitb5ff71e261b637ab7088fb5c3314bf71d6e01da7 (patch)
tree085ce85145fbf08dd4e4d536fca9b62beb712fa3 /llvm/lib/Transforms/Utils/ScalarEvolutionExpander.cpp
parent3fa503582315f23f187a019f026c5fce59b3f3d8 (diff)
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[RISCV] Shrink vslideup's LMUL when lowering fixed insert_subvector (#65997)
Similar to #65598, if we're using a vslideup to insert a fixed length vector into another vector, then we can work out the minimum number of registers it will need to slide up across given the minimum VLEN, and shrink the type operated on to reduce LMUL accordingly. This is somewhat dependent on #66211 , since it introduces a subregister copy that triggers a crash with -early-live-intervals in one of the tests. Stacked upon #66211
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