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Author SHA1 Message Date
Shuxin Yang 93b1f12ac1 Disable some unsafe-fp-math DAG-combine transformation after legalization. 
For instance, following transformation will be disabled:
    x + x + x => 3.0f * x;

The problem of these transformations is that it introduces a FP constant, which
following Instruction-Selection pass cannot handle.

Reviewed by Nadav, thanks a lot!

rdar://13445387

llvm-svn: 177933
 2013-03-25 22:52:29 +00:00
Shuxin Yang cadd8a068e rdar://13126763 
Fix a bug in DAGCombine. The symptom is mistakenly optimizing expression
"x + x*x" into "x * 3.0".

llvm-svn: 174239
 2013-02-02 00:22:03 +00:00