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This is a bug that crops if BindToRegister() is called multiple times in a row without a R() function call between them. How to reproduce the bug: 1) Have a completely filled cache with no host register remaining 2) Call BindToRegister() with different guest registers 3) Don't call R() between the BindToRegister() calls. This issue typically wouldn't be seen for a couple of reasons. Typically we have /plenty/ of registers in the cache, and in most cases we only call BindToRegister() once per instruction. In the off chance that it is called multiple times, it wouldn't update the last used counts and would flush the same register as the previous call to it.