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Hi Kameshwar, You're best off sending emails such as this to the LLVM developers mailing list (llvmdev at cs.uiuc.edu). You'll reach a much wider audience. The PBQPRegAlloc::buildInterferenceMatrix method constructs a PBQP cost matrix representing a single interference constraint, which doesn't sound like what you want. It is only used by the PBQP allocator (-regalloc=pbqp), whereas LLVM uses linear scan by default (-regalloc=linscan). That's why you're not seeing it called. LLVM...