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author | Roman Divacky <rdivacky@FreeBSD.org> | 2010-04-06 15:52:58 +0000 |
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committer | Roman Divacky <rdivacky@FreeBSD.org> | 2010-04-06 15:52:58 +0000 |
commit | 9f4a1da9a0a56a0b0a7f8249f34b3cdea6179c41 (patch) | |
tree | 0dd020f28a4846707f8d60717d9b2921ea187bd8 /lib/CodeGen/MachineSink.cpp | |
parent | b5efedaf2ab20d844d5a21cdef76b55acbf4f01c (diff) | |
download | src-9f4a1da9a0a56a0b0a7f8249f34b3cdea6179c41.tar.gz src-9f4a1da9a0a56a0b0a7f8249f34b3cdea6179c41.zip |
Update LLVM to r100520.
Notes
Notes:
svn path=/vendor/llvm/dist/; revision=206274
Diffstat (limited to 'lib/CodeGen/MachineSink.cpp')
-rw-r--r-- | lib/CodeGen/MachineSink.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/CodeGen/MachineSink.cpp b/lib/CodeGen/MachineSink.cpp index e47ba7c2cc37..e65961901578 100644 --- a/lib/CodeGen/MachineSink.cpp +++ b/lib/CodeGen/MachineSink.cpp @@ -126,6 +126,11 @@ bool MachineSinking::ProcessBlock(MachineBasicBlock &MBB) { // Can't sink anything out of a block that has less than two successors. if (MBB.succ_size() <= 1 || MBB.empty()) return false; + // Don't bother sinking code out of unreachable blocks. In addition to being + // unprofitable, it can also lead to infinite looping, because in an unreachable + // loop there may be nowhere to stop. + if (!DT->isReachableFromEntry(&MBB)) return false; + bool MadeChange = false; // Walk the basic block bottom-up. Remember if we saw a store. |