[PATCH] Fix optnone on Windows

[Robinson, Paul]

Ping.

> -----Original Message-----
> From: llvm-commits-bounces at cs.uiuc.edu [mailto:llvm-commits-
> bounces at cs.uiuc.edu] On Behalf Of Robinson, Paul
> Sent: Monday, October 20, 2014 3:55 PM
> To: llvm-commits at cs.uiuc.edu
> Subject: [PATCH] Fix optnone on Windows
> 
> [PATCH] Fix optnone on Windows
> 
> Normally an 'optnone' function goes through fast-isel, which does not
> call DAGCombiner.  But we ran into a case (on Windows) where the
> calling convention causes argument lowering to bail out of fast-isel,
> and we end up in CodeGenAndEmitDAG() which does run DAGCombiner.
> So, we need to make DAGCombiner check for 'optnone' after all.
> 
> Along the way we discovered we hadn't committed all the tests we had
> written for 'optnone' so here are two more. 'fastmath-optnone.ll' is
> the test that caught this, 'optnone-simple.ll' is one we missed from
> our original implementation.
> Thanks,
> --paulr

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