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Allow cheap instructions to be hoisted if they are register pressure neutral or better. This happens if the instruction is the last loop use of another virtual register. Only expensive instructions are allowed to increase loop register pressure. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154455 91177308-0d34-0410-b5e6-96231b3b80d8 |
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