[PATCH] Disable DAGCombine for -O0 and optnone

[Paul Robinson]

I had one inline comment about how to test for the correct conditions.

I think the updated 'dag-optnone.ll' already covers everything that's in 'fastmath-optnone.ll' so you don't need to add the latter as a new test.

I'm not qualified to review all the other test changes, someone else will need to do that.


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================
Comment at: lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1204
@@ +1203,3 @@
+    !DAG.getMachineFunction().getFunction()->hasFnAttribute(
+      Attribute::OptimizeNone);
+
----------------
It should be sufficient to test OptLevel here.  OptimizeNone should have reset OptLevel for the current function, so you should not need to check the attribute directly.

http://reviews.llvm.org/D9992

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