Wireshark-bugs: [Wireshark-bugs] [Bug 10798] HTTP Requests are only partially dissected (data is
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Fri, 30 Jan 2015 20:06:09 +0000

Comment # 28 on bug 10798 from 
Some poking at the clang SVN repository found the revision number 144073:

    efriedma | 2011-11-07 20:13:51 -0800 (Mon, 07 Nov 2011)

    Misc fixes to pcmp*stri.

which

    1) changed the definitions of _mm_cmpistr[acosz]() in
lib/Headers/smmintrin.h to take 3 rather than 5 arguments and to pass those 3,
rather than 5, arguments to __builtin_ia32_pcmpistri[acosz]128()

and

    2) comments out, with the comment

// FIXME: These builtins are horribly broken; reenable when PR11305 is fixed.

       lines in include/clang/Basic/BuiltinsX86.def that enable the
__builtin_ia32_pcmp[ie]stri[acosz]128() builtins in the first place!

This might produce the broken clangs I'm seeing on my Lion machine.

So it might be that:

    compilers before that revision generate bad code;

    compilers after that revision but before 161318 and 161319 may give compile
errors if you try to use those builtins;

    compilers after those revisions may work OK.

Those two are

   ctopper | 2012-08-05 23:22:36 -0700 (Sun, 05 Aug 2012)

    Implement proper handling for pcmpistri/pcmpestri intrinsics. Requires
custom handling in DAGISelToDAG due to limitations in TableGen's implicit def
handling. Fixes PR11305.

and

    ctopper | 2012-08-06 00:07:06 -0700 (Mon, 06 Aug 2012)

    Re-enable pcmpistri/pcmpestri builtins in clang now that llvm supports them
properly.

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