[LLVMdev] ISel Pattern Preferences

[David Greene]

What's a reliable way to prefer one patterns over another?  I have two 
patterns with different predicates.  Pattern A has a very general predicate 
to catch a wide variety of store instructions.  Pattern B has a narrower 
predicate meant to catch very specific store instructions that would also 
satisfy the predicate for Pattern A.

We used to match Pattern B just fine but after changing .td files a bit the 
selector is always picking Pattern A.

Setting AddedComplexity doesn't seem to help.

                                                -Dave