Handle the special case of registers begin redefined by early-clobber defs.
In this case, the value need to be available at the load index instead of the
normal use index.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127167 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index d326729..4dda548 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -779,6 +779,13 @@
if (VNI->isUnused())
continue;
NewLI.addRange(LiveRange(VNI->def, VNI->def.getNextSlot(), VNI));
+
+ // A use tied to an early-clobber def ends at the load slot and isn't caught
+ // above. Catch it here instead. This probably only ever happens for inline
+ // assembly.
+ if (VNI->def.isUse())
+ if (VNInfo *UVNI = li->getVNInfoAt(VNI->def.getLoadIndex()))
+ WorkList.push_back(std::make_pair(VNI->def.getLoadIndex(), UVNI));
}
// Keep track of the PHIs that are in use.