[LLVMdev] which Register allocator to use with llc -O0

[Pankaj Gode]

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 what will be consequence of forcefully enabling 'greedy allocation' ?
 
Regards,
Pankaj
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