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2015 Aug 28
6
Aligned vector spills and variably sized stack frames
I've run into a problem that I'm trying to figure out how to address and would welcome ideas and feedback. Today, the vectorizer will nicely vectorize loops using the widest legal vector type for the target. On a reasonable recent machine, this will often end up using AVX2 registers which are 32 bytes wide. If during register allocation, we decide to spill one of these registers, we