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[VPlan, VP] Introduce new recipes to support predicated vectorization
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Authored by vkmr on Jun 20 2021, 4:38 PM.

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Summary

This patch introduces new VPlan recipes VPWidenEVLRecipe, VPPredicatedWidenRecipe, VPPredicatedWidenMemoryInstrctionRecipe, and AllTrueMask VPInstruction as a first step to enable predicated vectorization introduced in RFC patch D99750.

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