[llvm-commits] [llvm] r140852 - in /llvm/trunk: lib/Transforms/InstCombine/InstCombine.h lib/Transforms/InstCombine/InstructionCombining.cpp test/Transforms/InstCombine/LandingPadClauses.ll

[John McCall]

On Sep 30, 2011, at 6:12 AM, Duncan Sands wrote:
> URL: http://llvm.org/viewvc/llvm-project?rev=140852&view=rev
> Log:
> Inlining often produces landingpad instructions with repeated
> catch or repeated filter clauses.  Teach instcombine a bunch
> of tricks for simplifying landingpad clauses.  Currently the
> code only recognizes the GNU C++ and Ada personality functions,
> but that doesn't stop it doing a bunch of "generic" transforms
> which are hopefully fine for any real-world personality function.
> If these "generic" transforms turn out not to be generic, they
> can always be conditioned on the personality function.  Probably
> someone should add the ObjC++ personality function.  I didn't as
> I don't know anything about it.

It would make sense for this to be based on an always-valid analysis
pass like TargetData.  That way, frontends can tell LLVM about
their crazy new personality functions without us having to hack
LLVM every time.

John.