Re: ARM GCC 8.x Performance Dropping Compared to Linaro GCC 7.x

2019-08-21 Thread Maxim Kuvyrkov
Hi Yupeng, Great testcase, thanks! I've investigated this, and there are two separate changes between GCC 7 and GCC 8 each causing half of the regression. The first regression is due compiler making unlucky decisions. Before the regression compiler just got lucky, and I'll look into bringing

Re: ARM GCC 8.x Performance Dropping Compared to Linaro GCC 7.x

2019-08-21 Thread Yupeng Chang
Hi Maxim, Thank you very much for looking into this ! Hope you can fix this regression and bring performance back to GCC! :D Yupeng Chang Aug 22 2019 On Wed, Aug 21, 2019 at 10:21 PM Maxim Kuvyrkov wrote: > Hi Yupeng, > > Great testcase, thanks! > > I've investigated this, and there are two sep