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I see that, in Greedy register allocation not all the XMM registers are used(even there is a need) if there is a function call crossing the live range.

There are spills which can be avoided just by using them.

The reason I see is the CCC declares XMMs are not callee saved. This means they are caller saved, correct me if I am wrong.

Is the greedy RA intentionally not using XMMs in order to avoid saving and restoring regs at call site?

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