Changes in directory llvm/lib/Transforms/Scalar:
LoopUnswitch.cpp updated: 1.42 -> 1.43
---
Log message:
Don't unswitch really large loops even if they are mostly filled with empty
blocks.
---
Diffs of the changes: (+6 -0)
LoopUnswitch.cpp | 6 ++++++
1 files changed, 6 insertions(+)
Index: llvm/lib/Transforms/Scalar/LoopUnswitch.cpp
diff -u llvm/lib/Transforms/Scalar/LoopUnswitch.cpp:1.42
llvm/lib/Transforms/Scalar/LoopUnswitch.cpp:1.43
--- llvm/lib/Transforms/Scalar/LoopUnswitch.cpp:1.42 Tue Jun 27 17:26:09 2006
+++ llvm/lib/Transforms/Scalar/LoopUnswitch.cpp Wed Jun 28 11:38:55 2006
@@ -333,6 +333,12 @@
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.
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