diff options
Diffstat (limited to 'lib/CodeGen/StrongPHIElimination.cpp')
| -rw-r--r-- | lib/CodeGen/StrongPHIElimination.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/CodeGen/StrongPHIElimination.cpp b/lib/CodeGen/StrongPHIElimination.cpp index ff58e796bf..5b80b94f3f 100644 --- a/lib/CodeGen/StrongPHIElimination.cpp +++ b/lib/CodeGen/StrongPHIElimination.cpp @@ -552,7 +552,10 @@ void StrongPHIElimination::processPHIUnion(MachineInstr* Inst, DomForestNode* child = *CI; // If the current node is live-out of the defining block of one of its - // children, insert a copy for it + // children, insert a copy for it. NOTE: The paper actually calls for + // a more elaborate heuristic for determining whether to insert copies + // for the child or the parent. In the interest of simplicity, we're + // just always choosing the parent. if (isLiveOut(DFNode->getReg(), MRI.getVRegDef(child->getReg())->getParent(), MRI, LV)) { // Insert copies for parent |