diff options
| -rw-r--r-- | lib/CodeGen/MachineLICM.cpp | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/lib/CodeGen/MachineLICM.cpp b/lib/CodeGen/MachineLICM.cpp index 4c054f51f3..83f66ce094 100644 --- a/lib/CodeGen/MachineLICM.cpp +++ b/lib/CodeGen/MachineLICM.cpp @@ -489,8 +489,12 @@ void MachineLICM::HoistRegion(MachineDomTreeNode *N) { } const std::vector<MachineDomTreeNode*> &Children = N->getChildren(); - for (unsigned I = 0, E = Children.size(); I != E; ++I) - HoistRegion(Children[I]); + // Don't hoist things out of a large switch statement. This often causes + // code to be hoisted that wasn't going to be executed, and increases + // register pressure in a situation where it's likely to matter. + if (Children.size() < 10) + for (unsigned I = 0, E = Children.size(); I != E; ++I) + HoistRegion(Children[I]); } /// IsLICMCandidate - Returns true if the instruction may be a suitable |