diff options
Diffstat (limited to 'lib/CodeGen/RegAllocLinearScan.cpp')
| -rw-r--r-- | lib/CodeGen/RegAllocLinearScan.cpp | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/lib/CodeGen/RegAllocLinearScan.cpp b/lib/CodeGen/RegAllocLinearScan.cpp index 14f672666d..b959878bcd 100644 --- a/lib/CodeGen/RegAllocLinearScan.cpp +++ b/lib/CodeGen/RegAllocLinearScan.cpp @@ -431,8 +431,12 @@ void RALinScan::ComputeRelatedRegClasses() { for (DenseMap<unsigned, const TargetRegisterClass*>::iterator I = OneClassForEachPhysReg.begin(), E = OneClassForEachPhysReg.end(); I != E; ++I) - for (const unsigned *AS = tri_->getAliasSet(I->first); *AS; ++AS) - RelatedRegClasses.unionSets(I->second, OneClassForEachPhysReg[*AS]); + for (const unsigned *AS = tri_->getAliasSet(I->first); *AS; ++AS) { + const TargetRegisterClass *AliasClass = + OneClassForEachPhysReg.lookup(*AS); + if (AliasClass) + RelatedRegClasses.unionSets(I->second, AliasClass); + } } /// attemptTrivialCoalescing - If a simple interval is defined by a copy, try |