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Issues with loading to neon registers above q7

Brett Park
Note: This was originally posted on 29th June 2010 at http://forums.arm.com

Have you seen any issues with vld and registers q8-15?

For some reason, doing a load to registers below q8 work fine, but above q8 the registers don't get set.

For example, the first won't work but the second will.

in this case, r3 contains a pointer to a float array (4 floats)

vld1.32 {d16-d17}, [r3]
vld1.32 {d0-d1}, [r3]

any ideas?
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  • Note: This was originally posted on 20th July 2010 at http://forums.arm.com

    I have the problem with gdb. But this is a debugger problem (it doesn't refresh the content of registers q7-q15 and d14-d31), not a problem with neon.
    You can try to copy data using q7-q15 it should work and prove that there's no problem.



    It appears you are correct. I loaded the data into q8, then moved q8 to q0. q0 then displays the data that I expect to see. Therefore, it appears that q8-q15 are not being updated or read correctly by gdb.

    I have filed a bug report with gdb - [url="http://sourceware.org/bugzilla/show_bug.cgi?id=11824"]Bug Report[/url]

    Thanks.
Reply
  • Note: This was originally posted on 20th July 2010 at http://forums.arm.com

    I have the problem with gdb. But this is a debugger problem (it doesn't refresh the content of registers q7-q15 and d14-d31), not a problem with neon.
    You can try to copy data using q7-q15 it should work and prove that there's no problem.



    It appears you are correct. I loaded the data into q8, then moved q8 to q0. q0 then displays the data that I expect to see. Therefore, it appears that q8-q15 are not being updated or read correctly by gdb.

    I have filed a bug report with gdb - [url="http://sourceware.org/bugzilla/show_bug.cgi?id=11824"]Bug Report[/url]

    Thanks.
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