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
