Speed up addRegisterDead by adding more fast checks before performing the expensive
subregister query, and by increasing the size of the subregister hashtable so
that there are fewer collisions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54781 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index c952293..d602e24 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -834,7 +834,9 @@
// There exists a super-register that's marked dead.
if (RegInfo->isSuperRegister(IncomingReg, Reg))
return true;
- if (RegInfo->isSubRegister(IncomingReg, Reg))
+ if (RegInfo->getSubRegisters(IncomingReg) &&
+ RegInfo->getSuperRegisters(Reg) &&
+ RegInfo->isSubRegister(IncomingReg, Reg))
DeadOps.push_back(i);
}
}