Changes in directory llvm/lib/Transforms/Scalar:
LoopUnswitch.cpp updated: 1.34 -> 1.35
---
Log message:
Fix Regression/Transforms/LoopUnswitch/2006-02-22-UnswitchCrash.ll, which
caused SPASS to fail building last night.
We can't trivially unswitch a loop if the exit block has phi nodes in it,
because we don't know which predecessor to use.
---
Diffs of the changes: (+3 -1)
LoopUnswitch.cpp | 4 +++-
1 files changed, 3 insertions(+), 1 deletion(-)
Index: llvm/lib/Transforms/Scalar/LoopUnswitch.cpp
diff -u llvm/lib/Transforms/Scalar/LoopUnswitch.cpp:1.34
llvm/lib/Transforms/Scalar/LoopUnswitch.cpp:1.35
--- llvm/lib/Transforms/Scalar/LoopUnswitch.cpp:1.34 Wed Feb 22 00:37:14 2006
+++ llvm/lib/Transforms/Scalar/LoopUnswitch.cpp Wed Feb 22 17:55:00 2006
@@ -325,7 +325,9 @@
}
}
- if (!LoopExitBB)
+ // If we didn't find a single unique LoopExit block, or if the loop exit
block
+ // contains phi nodes, this isn't trivial.
+ if (!LoopExitBB || isa<PHINode>(LoopExitBB->begin()))
return false; // Can't handle this.
if (LoopExit) *LoopExit = LoopExitBB;
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