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Thread: Teensyduino 1.34 Beta #1 (ARM Toolchain Update)

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  1. #11
    Senior Member+ Frank B's Avatar
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    Quote Originally Posted by manitou View Post
    you're right, RPI3 jessie is still running in 32 bit mode.

    i tested 1.6.12 with 1.34beta1 on mac os,
    coremark:
    previously T3.2@96mhz -O2 189.4 iterations/sec | with LTO fastest 207.29
    previously T3.6@180mhz -O2 384.0 | with LTO fastest 447.7
    ... so many optimization choices ...

    Code:
    T3.6@180mhz coremark
            fastest LTO 447.676389
            fastest     463.692033
            faster LTO  437.121360
            faster      434.528617
            fast  LTO   333.619557
            fast        333.032915
            small LTO   323.248789  no float printf
            small       320.692182
    GCC6 :

    - 180MHz fastest with LTO: Compiler crashes with this sketch ("lto1.exe: internal compiler error: Segmentation fault")
    - 180MHz fastest withou tLTO:
    Code:
    Start
    2K performance run parameters for coremark.
    CoreMark Size    : 666
    Total ticks      : 13072
    Total time (secs): 13.072000
    Iterations/Sec   : 458.996328
    Iterations       : 6000
    Compiler version : GCC6.2.1 20161205 (release) [ARM/embedded-6-branch revision 243739]
    Compiler flags   : 
    Memory location  : STACK
    seedcrc          : 0xe9f5
    [0]crclist       : 0xe714
    [0]crcmatrix     : 0x1fd7
    [0]crcstate      : 0x8e3a
    [0]crcfinal      : 0xa14c
    Correct operation validated. See readme.txt for run and reporting rules.
    CoreMark 1.0 : 458.996328 / GCC6.2.1 20161205 (release) [ARM/embedded-6-branch revision 243739]  / STACK
    So, again 10 points faster, even without LTO (more than twice as fast as T3.2 @ 96MHz)

    240MHz: 612.199466 ... no comment ..wow..
    My benchmarks were done with "-mpure-code" - seems to be a little bit faster.
    Last edited by Frank B; 01-22-2017 at 07:32 PM.

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