4 Commits

Author	SHA1	Message	Date
Dan Gohman	09984279fd	Add a form of addPreserved which takes a string argument, to allow passes ... to declare that they preserve other passes without needing to pull in additional header file or library dependencies. Convert MachineFunctionPass and CodeGenLICM to make use of this. llvm-svn: 83555	2009-10-08 17:00:02 +00:00
Dan Gohman	43d6830ea0	Nick pointed out that DominanceFrontier and DominanceTree are preserved ... by setPreservesCFG(). llvm-svn: 82463	2009-09-21 17:54:42 +00:00
Dan Gohman	af57ae3da4	Remove the special-case for constants in PHI nodes; it's not really ... helpful, and it didn't correctly handle the case of constants input to PHIs for backedges. llvm-svn: 82462	2009-09-21 17:53:35 +00:00
Dan Gohman	0f64d71d99	Add a new pass for doing late hoisting of floating-point and vector ... constants out of loops. These aren't covered by the regular LICM pass, because in LLVM IR constants don't require separate instructions. They're not always covered by the MachineLICM pass either, because it doesn't know how to unfold folded constant-pool loads. This is somewhat experimental at this point, and off by default. llvm-svn: 82076	2009-09-16 20:25:11 +00:00