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(parent: 080e187) | patch
Eliminate reachability matrix. It has to be calculated before any instruction
authorEvan Cheng <evan.cheng@apple.com>
Tue, 8 Aug 2006 00:31:00 +0000 (00:31 +0000)
committerEvan Cheng <evan.cheng@apple.com>
Tue, 8 Aug 2006 00:31:00 +0000 (00:31 +0000)
commitf4b4c416d361e0f4523200a60d5fc290da1e8319
treeb923bcbcaf1d1388fbbbb4daf19c6fe24fc5ada1tree | snapshot
parent080e187dfba3730b6eb45779c92f8aabb94c998acommit | diff
Eliminate reachability matrix. It has to be calculated before any instruction
selection is done. That's rather expensive especially in situations where it
isn't really needed.
Move back to a searching the predecessors, but make use of topological order
to trim the search space.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29559 91177308-0d34-0410-b5e6-96231b3b80d8
lib/Target/X86/X86ISelDAGToDAG.cpp diff | blob | history
C/C++ LLVM-based compilers that forbids OOTA behaviors