On 9 June 2014 06:59, Chaos Shu <chaos.s...@live.com> wrote: > I’ve noticed that Qemu maintained the target arch register in memory for > capacity, but the load/store really cost a bit much, is there any way map > the register directly.
Our JIT's register allocator will avoid storing the guest register value back to RAM unless it has to (eg if we might be about to fault, call a helper which would trash the host register, etc). Using a target-agnostic JIT like this is a pretty fundamental design decision that isn't easy to change. In any case the regs[] array in the CPU state struct will always be in L1 cache so access will be fast. thanks -- PMM
