On Sun, Apr 22, 2012 at 12:07:40PM +0800, 陳韋任 wrote: > > I am using qemu to run VMs on my computer with amd chip on board. > > However, my computer doesn't support amd-v, so the performance of the VM is > > low. > > I do have experiences in optimization of program using sse technique. > > Is it possible to speed up the qemu for those x86 chips that do not support > > hardware virtualization using sse instructions ? > > If so, I would like to contribute the the qemu community. > > Without hardware virtualization (amd-v, for example), QEMU uses binary > translation to run your VM. That says each guest instruction executed by > the VM is translated into TCG ops (QEMU IR), then translated into host > instructions and executed. Perhaps you have to look at tcg/i386/*, which > is the TCG ops -> host binary part. Or, you can look at target-i386/*, > which is the guest binary -> TCG ops part. Currently, guest SIMD instruction > is emulated by helper functions in scalar manner. Maybe you can try to map > guest SIMD into host SIMD.
Or, you can use LLVM to speedup QEMU! Just let LLVM worry about how to generate SSE instructions. ;) Regards, chenwj -- Wei-Ren Chen (陳韋任) Computer Systems Lab, Institute of Information Science, Academia Sinica, Taiwan (R.O.C.) Tel:886-2-2788-3799 #1667 Homepage: http://people.cs.nctu.edu.tw/~chenwj
