diff options
Diffstat (limited to 'lib/Transforms')
| -rw-r--r-- | lib/Transforms/Scalar/LoopUnswitch.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/LoopUnswitch.cpp b/lib/Transforms/Scalar/LoopUnswitch.cpp index d33dcb7c0b..945803f0af 100644 --- a/lib/Transforms/Scalar/LoopUnswitch.cpp +++ b/lib/Transforms/Scalar/LoopUnswitch.cpp @@ -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. |