Florian Hahn 4864887dc5 [VPlan] Add VPDef class. ... This patch introduces a new VPDef class, which can be used to manage VPValues defined by recipes/VPInstructions. The idea here is to mirror VPUser for values defined by a recipe. A VPDef can produce either zero (e.g. a store recipe), one (most recipes) or multiple (VPInterleaveRecipe) result VPValues. To traverse the def-use chain from a VPDef to its users, one has to traverse the users of all values defined by a VPDef. VPValues now contain a pointer to their corresponding VPDef, if one exists. To traverse the def-use chain upwards from a VPValue, we first need to check if the VPValue is defined by a VPDef. If it does not have a VPDef, this means we have a VPValue that is not directly defined iniside the plan and we are done. If we have a VPDef, it is defined inside the region by a recipe, which is a VPUser, and the upwards def-use chain traversal continues by traversing all its operands. Note that we need to add an additional field to to VPVAlue to link them to their defs. The space increase is going to be offset by being able to remove the SubclassID field in future patches. Reviewed By: Ayal Differential Revision: https://reviews.llvm.org/D90558		2020-11-17 16:18:11 +00:00
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GitHubMove.rst
LLVMLibC.rst
TestSuite.rst
VariableNames.rst
VectorizationPlan.rst
VectorPredication.rst