Julian Seward jseward-at-acm.org |valgrind-users| wrote:
> It's true that Memcheck doesn't check for identical args to Iop_Xor32.
> That's because it relies on the compilation pipeline ahead of it to 
> clean such cases up.

Ah-hah. I was sure I had missed something. It seems like something that
would have occurred far too often in practice to have been missed up
until now. I was able to construct a simple test case for pcmpeq, but I
can confirm that substituting in xor instead does not trigger the problem.

>> Should I file a bug report?
> 
> Yes, please do.

http://bugs.kde.org/show_bug.cgi?id=213685

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