On Wed, Mar 06, 2013 at 11:47:58AM +0800, Peter Maydell wrote: > On 6 March 2013 11:30, 陳韋任 (Wei-Ren Chen) <che...@iis.sinica.edu.tw> wrote: > > While searching for QEMU SIMD issues, I found there was a paper presented > > in 2011 [1], and the source code is also public on [2]. However, it seems > > this project doesn't make any progress since last year. I update their > > change to upstream and you can download from here: > > > > $ git clone git://github.com/azru0512/qemu.git -b neon-simd > > > > Sadly, it can not boot the kernel image provided on [2]. Anyway, I > > found there was only one thread has discussion on their work [3]. I want > > to hear more feedback on their idea on adding SIMD TCG IR. > > I think my opinions are still the same -- interesting idea, but getting > it to work with a set of IR ops which aren't target or host specific > and getting it to give correct bit-for-bit results, rounding, flags, > etc, is likely to be tricky. It would also be important to determine > first whether Neon (or other SIMD) emulation performance is truly > a major bottleneck.
I found the problem and now it can boot the kernel image and run the test. The authors claim they design the general SIMD IR after studying various SIMD ISA. I am not an expert, and only can decide if it's true or not by writing another frontend. Well, one of reasons I am studying their work is to see SIMD IR could benifit our QEMU+LLVM binary translator. ;) 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