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Hi,   We were using "linearscan" register scan with llc -O0 option. As per the llvm blog, this is replaced with greedy register alloation. http://blog.llvm.org/2011/09/greedy-register-allocation-in-llvm-30.html   But I think, this register allocation (i.e. 'greedy and 'basic') is blocked if used with -O0 option of llc. Only 'fast register allocator' option can be used with -O0.   I wanted to understand that wh...