PATCH: Add AVX support to x86-64 _dl_runtime_profile

[Ulrich Drepper]

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I think I got your patches applied.

But then I changed the whole approach quite a bit.  The problem is that
your patches create a writable code pointer.  That's bad security-wise.
 Instead I opted for the slightly slower test of a flag and just one
code path.  This is a tad slower but safer.

I also fixed a few problems:

- - the decision whether to use xmm or ymm content is not all or nothing.
  it's per register

- - you didn't restore the FP stack correctly after pltexit


There are two more things to do:

- - the test for AVX availability should be done only once.  It should
  move into the code which selected which trampoline code to use

- - the XMM restoration when YMM is available is not enough.  If there
  are stacked audit modules we have to check whether the XMM part is
  modified, propagate the new content if necessary into the YMM
  element, and update the "old value" field

Perhaps you can work on these two issues.

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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