Fix PR4419: handle defs of partial uses.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73816 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveVariables.cpp b/lib/CodeGen/LiveVariables.cpp
index 6228821..bd84508 100644
--- a/lib/CodeGen/LiveVariables.cpp
+++ b/lib/CodeGen/LiveVariables.cpp
@@ -359,12 +359,11 @@
// That is, unless we are currently processing the last reference itself.
LastRefOrPartRef->addRegisterDead(Reg, TRI, true);
- /* Partial uses. Mark register def dead and add implicit def of
- sub-registers which are used.
- FIXME: LiveIntervalAnalysis can't handle this yet!
- EAX<dead> = op AL<imp-def>
- That is, EAX def is dead but AL def extends pass it.
- Enable this after live interval analysis is fixed to improve codegen!
+ // Partial uses. Mark register def dead and add implicit def of
+ // sub-registers which are used.
+ // EAX<dead> = op AL<imp-def>
+ // That is, EAX def is dead but AL def extends pass it.
+ // Enable this after live interval analysis is fixed to improve codegen!
else if (!PhysRegUse[Reg]) {
PhysRegDef[Reg]->addRegisterDead(Reg, TRI, true);
for (const unsigned *SubRegs = TRI->getSubRegisters(Reg);
@@ -377,7 +376,7 @@
PartUses.erase(*SS);
}
}
- } */
+ }
else
LastRefOrPartRef->addRegisterKilled(Reg, TRI, true);
return true;