Hi Peter, The errata fix can be turned on and off at compile time with the flags -mfix-cortex-a53-835769 and -mno-fix-cortex-a53-835769 it is also possible to turn it on by default when configuring GCC with the configure flag --enable-fix-cortex-a53-835769 (I don't know yet if the decision to turn it on by default in our binary releases was taken or not).
The possibility to workaround the hardware bug has to be and remain in the compiler to allow the users that have such a revision of the core to avoid the issue, and it will stay in the compiler even after fixed revisions of the core will be out, for legacy reason. Thanks, Yvan On 21 October 2014 03:46, Panshilin (Peter) <peter.panshi...@hisilicon.com> wrote: > Hi Yvan : > > Thanks. > other questions about this patch: > > Will the patch stay in all arm64 compilers for ever? or someday it will be > discarded for optimization reasons? > > Would you provide a compiler option which enable or disable the patch during > buiding and if so what the option is? > > Thanks again. > > Peter > > > ________________________________________ > 发件人: Yvan Roux [yvan.r...@linaro.org] > 发送时间: 2014年10月15日 17:17 > 收件人: Panshilin (Peter) > 抄送: Linaro Toolchain > 主题: Re: Will this ARM64 erratum patch be backported to this month's Linaro > GCC 4.9 release? > > Hi Peter, > > yes it will be part of our release. > > Rgds, > Yvan > > On 15 October 2014 11:11, Panshilin (Peter) > <peter.panshi...@hisilicon.com> wrote: >> Dear all concerned: >> >> ARM has reported it's 53's bug:AArch64 multiply-accumulate instruction might >> produce incorrect result >> and developed the patch descriped below. will the patch be backported to >> Linaro 4.9 this month's release. >> https://gcc.gnu.org/ml/gcc-cvs/2014-10/msg00335.html >> >> thanks >> >> Peter >> _______________________________________________ >> linaro-toolchain mailing list >> linaro-toolchain@lists.linaro.org >> http://lists.linaro.org/mailman/listinfo/linaro-toolchain _______________________________________________ linaro-toolchain mailing list linaro-toolchain@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-toolchain
