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Commit 28557e8c authored by Fanchen Kong's avatar Fanchen Kong Committed by Thomas Lively
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[WebAssembly] Improve codegen for shuffles with undefined lane indices 

For undefined lane indices, fill the mask with {0..N} instead of zeros to allow
further reduction to word/dword shuffle on the VM.

Reviewed By: tlively, penzn

Differential Revision: https://reviews.llvm.org/D133473
parent b340c5ae
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