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Fix test for switch statements and increase

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threshold a bit per experimentation.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108935 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen
2010-07-20 21:29:12 +00:00
parent c510a7097b
commit 21d35c1399
1 changed files with 3 additions and 2 deletions
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5
lib/CodeGen/MachineLICM.cpp
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@ -488,14 +488,15 @@ void MachineLICM::HoistRegion(MachineDomTreeNode *N) {
MII = NextMII; MII = NextMII;
} }
const std::vector<MachineDomTreeNode*> &Children = N->getChildren();
// Don't hoist things out of a large switch statement. This often causes // 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 // code to be hoisted that wasn't going to be executed, and increases
// register pressure in a situation where it's likely to matter. // register pressure in a situation where it's likely to matter.
if (Children.size() < 10) if (BB->succ_size() < 25) {
const std::vector<MachineDomTreeNode*> &Children = N->getChildren();
for (unsigned I = 0, E = Children.size(); I != E; ++I) for (unsigned I = 0, E = Children.size(); I != E; ++I)
HoistRegion(Children[I]); HoistRegion(Children[I]);
} }
}
/// IsLICMCandidate - Returns true if the instruction may be a suitable /// IsLICMCandidate - Returns true if the instruction may be a suitable
/// candidate for LICM. e.g. If the instruction is a call, then it's obviously /// candidate for LICM. e.g. If the instruction is a call, then it's obviously