On Wed, May 4, 2011 at 3:59 AM, Max Filippov <jcmvb...@gmail.com> wrote: > See ISA, 4.7.1 for details. > > Physical registers and currently visible window are separate fields in > CPUEnv. Only current window is accessible to TCG. On operations that > change window base helpers copy current window to and from physical > registers.
I'm not sure how the register windows work, but maybe you could use the same trick used for Sparc. There is a pool of registers (env->regbase[]), a register window pointer (env->regwptr, cpu_regwptr) tracks which are the currently accessible ones. The advantage is to avoid copying (not entirely for Sparc due to the window overlap).
