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* Grab-bag of reassociate tweaks. Unify handling of dead instructions andDuncan Sands2012-06-061-4/+6
| | | | | | | | | instructions to reoptimize. Exploit this to more systematically eliminate dead instructions (this isn't very useful in practice but is convenient for analysing some testcase I am working on). No need for WeakVH any more: use an AssertingVH instead. llvm-svn: 158073
* Teach reassociate to commute FMul's and FAdd's in order to canonicalize the ↵Owen Anderson2012-05-071-0/+16
order of their operands across instructions. This allows for greater CSE opportunities. llvm-svn: 156323
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