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Implementation in NEON of non uniform address jumps

Rnjai Lamba
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  • Arm Employee Badge
    Note: This was originally posted on 13th July 2012 at http://forums.arm.com

    Without details of what goes wrong it is very hard to provide any specific help. In general "O3" is very aggressive and assumes you have coded to the C standard (this allows it to make more assumptions and so optimize more). If any of your code is "off spec" then you'll start getting issues.

    I would suggest one of:
    * Don't use O3 if you have issues
    * Look at using "objdump" (gcc) "fromelf" RVCT to dump the disassembly to see if you can spot the issue.
    * Try some smaller C files containing each function and compile most with O2 and then test each file individually with O3. This can help narrow it down.
Reply
  • Arm Employee Badge
    Note: This was originally posted on 13th July 2012 at http://forums.arm.com

    Without details of what goes wrong it is very hard to provide any specific help. In general "O3" is very aggressive and assumes you have coded to the C standard (this allows it to make more assumptions and so optimize more). If any of your code is "off spec" then you'll start getting issues.

    I would suggest one of:
    * Don't use O3 if you have issues
    * Look at using "objdump" (gcc) "fromelf" RVCT to dump the disassembly to see if you can spot the issue.
    * Try some smaller C files containing each function and compile most with O2 and then test each file individually with O3. This can help narrow it down.
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