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Don't unswitch really large loops even if they are mostly filled with empty

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blocks.

llvm-svn: 28959
This commit is contained in:
Chris Lattner 2006-06-28 16:38:55 +00:00
parent e123f47232
commit 1d8a141786
1 changed files with 6 additions and 0 deletions
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6
lib/Transforms/Scalar/LoopUnswitch.cpp
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@ -333,6 +333,12 @@ unsigned LoopUnswitch::getLoopUnswitchCost(Loop *L, Value *LIC) {
if (IsTrivialUnswitchCondition(L, LIC))
return 0;
// If the loop is really large (over twice our threshold) don't even consider
// unswitching it. This will produce a really large loop with lots of empty
// blocks.
if (L->getBlocks().size() > 2*Threshold)
return 2*Threshold;
unsigned Cost = 0;
// FIXME: this is brain dead. It should take into consideration code
// shrinkage.