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After register allocation it is possible to have a spill of a register that is only partially defined. That in itself it fine, but creates a problem for double vector registers. Stores of such registers are pseudo instructions that are expanded into pairs of individual vector stores, and in case of a partially defined source, one of the stores may use an entirely undefined register. To avoid this, track the defined parts and only generate actual stores for those. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284841 91177308-0d34-0410-b5e6-96231b3b80d8
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