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2010 Oct 03
1
[LLVMdev] [LLVMDev] Coalescing Registers
I want to full understand register coalescing and how to coalesce copies. From what I have seen from "SimpleRegisterCoalescing," "RegAllocLinearSpan," and "RegAllocPBQP" there are three indicators for the copy instruction x = copy y. Assume that the value number of x does not equal the value number of y. For "x = copy y", let the boolean values a,b, and c, equal the following: a = x is virtual or physical, b = y is vir...