Be more aggressive about removing joined physreg copies.
authorJakob Stoklund Olesen <stoklund@2pi.dk>
Thu, 5 Aug 2010 23:51:28 +0000 (23:51 +0000)
committerJakob Stoklund Olesen <stoklund@2pi.dk>
Thu, 5 Aug 2010 23:51:28 +0000 (23:51 +0000)
commitf67202c94d4eb2fab788196cab1ad138ea8e32cd
tree4eda04136090980b42f695f27bdd65974126d16f
parentc910c8d2fa6e73e8f9875e871a2f3a44574a0b01
Be more aggressive about removing joined physreg copies.

When a joined COPY changes subreg liveness, we keep it around as a KILL,
otherwise it is safe to delete.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110403 91177308-0d34-0410-b5e6-96231b3b80d8
lib/CodeGen/SimpleRegisterCoalescing.cpp