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439cc2c5de
Specifically, if there are copy-like instructions in the loop header they are moved into the loop close to their uses. This reduces the live intervals of the values and can avoid register spills. This is working towards a fix for http://llvm.org/PR22230. Review: http://reviews.llvm.org/D7259 Next steps: - Find a better cost model (which non-copy instructions should be sunk?) - Make this dependent on register pressure git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232262 91177308-0d34-0410-b5e6-96231b3b80d8