Don't add live ranges for aliases of physregs that are live in to the

function. They don't appear to be used, and are inconsistent with handling of
other physreg intervals (i.e. intervals that are not live-in) where ranges are
not inserted for aliases.

llvm-svn: 148986

1 files changed, 0 insertions, 5 deletions

diff --git a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
index 0e621ebc68c..b8e60bd1ec3 100644
--- a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -582,11 +582,6 @@ void LiveIntervals::computeIntervals() {
     for (MachineBasicBlock::livein_iterator LI = MBB->livein_begin(),
            LE = MBB->livein_end(); LI != LE; ++LI) {
       handleLiveInRegister(MBB, MIIndex, getOrCreateInterval(*LI));
-      // Multiple live-ins can alias the same register.
-      for (const unsigned* AS = tri_->getSubRegisters(*LI); *AS; ++AS)
-        if (!hasInterval(*AS))
-          handleLiveInRegister(MBB, MIIndex, getOrCreateInterval(*AS),
-                               true);
     }
 
     // Skip over empty initial indices.