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| author | Dan Gohman <gohman@apple.com> | 2009-03-20 01:28:21 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-03-20 01:28:21 +0000 |
| commit | 76402b9a3da351a54b33431db275ac5c54874fb2 (patch) | |
| tree | c0fff709cc0b6aa68b905a5eb9b0b359af4efd25 /llvm/lib/Analysis/LiveValues.cpp | |
| parent | 03e0a4f324d983d228c4a257a5865f1db8ca89c9 (diff) | |
| download | bcm5719-llvm-76402b9a3da351a54b33431db275ac5c54874fb2.tar.gz bcm5719-llvm-76402b9a3da351a54b33431db275ac5c54874fb2.zip | |
The last use in a block that doesn't have successors
(return or unreachable) is a kill.
llvm-svn: 67357
Diffstat (limited to 'llvm/lib/Analysis/LiveValues.cpp')
| -rw-r--r-- | llvm/lib/Analysis/LiveValues.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Analysis/LiveValues.cpp b/llvm/lib/Analysis/LiveValues.cpp index 2634463df20..21ddf6bc363 100644 --- a/llvm/lib/Analysis/LiveValues.cpp +++ b/llvm/lib/Analysis/LiveValues.cpp @@ -131,6 +131,11 @@ LiveValues::Memo &LiveValues::compute(const Value *V) { // Note the block in which this use occurs. M.Used.insert(UseBB); + // If the use block doesn't have successors, the value can be + // considered killed. + if (succ_begin(UseBB) == succ_end(UseBB)) + M.Killed.insert(UseBB); + // Observe whether the value is used outside of the loop in which // it is defined. Switch to an enclosing loop if necessary. for (; L; L = L->getParentLoop()) |
