Hello, I'm not sure from the information below whether you have observed a performance gap, or are expecting to observe one. Have you seen a performance gap?
Regards, Bernie On 5 January 2016 at 10:29, Xiaofeng Ren <xiaofeng....@nxp.com> wrote: > Hello All, > > I found one difference between gcc-linaro-5.1 vs gcc-linaro-4.8 while I’m > doing lmbench benchmark test for our LS1043 (cortex-A53). > > While using gcc-linaro-4.8, gcc will generate advanced SIMD instructions > (like as ld1, etc), however, gcc-linaro-5.1 will not generate advance SIMD > instructions. This will cause big performance gap between gcc-4.8 and > gcc-5.1 for lmbench memory bandwidth “fcp” test (bw_mem program). > > > > My compiler flags is “-O3 -mcpu=cortex-a53”. I also tried several different > compiler flags (“-O3 -mcpu=cortex-a53+fp+simd”, “-O2 -ftree-vectorize > -mcpu=cortex-a53”, “-O3 -ftree-vectorize -mcpu=cortex-a53”), all of them > doesn’t work. > > > > Gcc-5.1 toolchain was downloaded from following link: > > > > https://snapshots.linaro.org/openembedded/sources/gcc-linaro-5.1-snapshot-2015.06-1-x86_64_aarch64-linux-gnu.tar.xz > > > > Can I have your comments on this? > > > > > > Thanks > > Ron > > > _______________________________________________ > linaro-toolchain mailing list > linaro-toolchain@lists.linaro.org > https://lists.linaro.org/mailman/listinfo/linaro-toolchain > _______________________________________________ linaro-toolchain mailing list linaro-toolchain@lists.linaro.org https://lists.linaro.org/mailman/listinfo/linaro-toolchain
