arm-eabi toolchain memcpy using hard float causing unaligned access

Hi Linaro Team, I'm currently using toolchain gcc-linaro-7.1.1-2017.08-x86_64_arm-eabi.tar.xz to develop my bera-metal programs. My compile option is "-marm -march=armv7-a -mt

Re: arm-eabi toolchain memcpy using hard float causing unaligned access

mp;abc[i], &def[i]); memcpy(&abc[i], &def[i], sizeof(def) - i); } } If &abc[i] or &def[i] is not 4 bytes aligned, the whole system hangs. On Fri, Nov 10, 2017 at 4:04 PM Yupeng Chang wrote: > Hi Linaro Team, > I'm currently using toolchain > gcc-l

Re: arm-eabi toolchain memcpy using hard float causing unaligned access

ode without any unaligned access. Maxim Kuvyrkov 于 2017年11月15日周三 21:04写道： > > > On Nov 10, 2017, at 11:04 AM, Yupeng Chang wrote: > > > > Hi Linaro Team, > > I'm currently using toolchain > > gcc-linaro-7.1.1-2017.08-x86_64_arm-eabi.tar.xz > > < > htt

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

Hi Dear Linaro Team, I recently found a very strange issue regarding the code performance. I have a loop written in GCC NEON. The binary of this coded generated by Linaro GCC 7.x is much faster than it generated by ARM GCC 8.x My CPU is ARM Cortex-A53 AARCH64. The compile option is: -Wall -O3 -mcp

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

Hi Maxim, Thank you for your reply! I'll summarize a testcase for you! Yupeng Chang Aug 21 2019 On Tue, Aug 20, 2019 at 9:15 PM Maxim Kuvyrkov wrote: > Hi Yupeng, > > There are many changes from Linaro GCC 7.x to ARM GCC 8.x, so it is > difficult to guess what may be going

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

going wrong. > > Do you have a testcase that you can share? With a testcase we can > investigate the problem and, possibly, fix it. > > Regards, > > -- > Maxim Kuvyrkov > www.linaro.org > > > > > On Aug 19, 2019, at 7:14 AM, Yupeng Chang wrote: > > > &

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

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 thi

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

Hi Maxim, If you have any patches that need to be tested, you can send them to me. I can help you test this. Yupeng Chang Aug 23 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

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

sults and, especially, whether this patch > regresses any of your other testcases. > > -- > Maxim Kuvyrkov > www.linaro.org > > > > > On Aug 23, 2019, at 8:34 AM, Yupeng Chang wrote: > > > > Hi Maxim, > > If you have any patches that need to be tested, yo

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

Hi Maxim, This patch does fix part of the regression. I don't see other regression on other software with this patch. I'm waiting for more updates / fixes from you. And thank you very much for your work! Yupeng Chang Aug 30 2019 On Thu, Aug 29, 2019 at 10:51 PM Maxim Kuvyrkov wr

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

Hi Maxim, Thank you very much for investigating on this matter. Yupeng Chang Aug 31 2019 On Fri, Aug 30, 2019 at 2:36 PM Maxim Kuvyrkov wrote: > Hi Yupeng, > > I've filed https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91598 . All > future discussions will be in that bug e