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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148986 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index 0e621ebc68cfb6a9c1e0701ad5f46284fc95ab38..b8e60bd1ec3264596c454c3dcf7d9d36b65417a9 100644 (file)
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/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.