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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-02-06 21:52:18 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-02-06 21:52:18 +0000 |
| commit | 602cb9d9f2307913aa816abbe37fc158c79feb0a (patch) | |
| tree | b55e0cda3749d1a9e73e5b9d2dcaec5e737ca57f | |
| parent | 8833ef03b9ceaa52063116819fff8b3d16fd8933 (diff) | |
| download | external_llvm-602cb9d9f2307913aa816abbe37fc158c79feb0a.zip external_llvm-602cb9d9f2307913aa816abbe37fc158c79feb0a.tar.gz external_llvm-602cb9d9f2307913aa816abbe37fc158c79feb0a.tar.bz2 | |
Make sure a reserved register has a live interval before merging.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149910 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/CodeGen/RegisterCoalescer.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/CodeGen/RegisterCoalescer.cpp b/lib/CodeGen/RegisterCoalescer.cpp index cc9ec3c..c7be0b3 100644 --- a/lib/CodeGen/RegisterCoalescer.cpp +++ b/lib/CodeGen/RegisterCoalescer.cpp @@ -1414,8 +1414,12 @@ bool RegisterCoalescer::JoinIntervals(CoalescerPair &CP) { // Deny any overlapping intervals. This depends on all the reserved // register live ranges to look like dead defs. for (const unsigned *AS = TRI->getOverlaps(CP.getDstReg()); *AS; ++AS) { - if (!LIS->hasInterval(*AS)) + if (!LIS->hasInterval(*AS)) { + // Make sure at least DstReg itself exists before attempting a join. + if (*AS == CP.getDstReg()) + LIS->getOrCreateInterval(CP.getDstReg()); continue; + } if (RHS.overlaps(LIS->getInterval(*AS))) { DEBUG(dbgs() << "\t\tInterference: " << PrintReg(*AS, TRI) << '\n'); return false; |