Ignore unallocatable registers in RegAllocFast.

llvm-svn: 112632

diff --git a/llvm/lib/CodeGen/RegAllocFast.cpp b/llvm/lib/CodeGen/RegAllocFast.cpp
index 8f6496dcac794eae079cefebd4698d182c1930db..237686859fa951a8f327a5d66a0e5f7cf8b144d5 100644 (file)
--- a/llvm/lib/CodeGen/RegAllocFast.cpp
+++ b/llvm/lib/CodeGen/RegAllocFast.cpp
@@ -736,7 +736,8 @@ void RAFast::AllocateBasicBlock() {
   // Add live-in registers as live.
   for (MachineBasicBlock::livein_iterator I = MBB->livein_begin(),
          E = MBB->livein_end(); I != E; ++I)
-    definePhysReg(MII, *I, regReserved);
+    if (Allocatable.test(*I))
+      definePhysReg(MII, *I, regReserved);
 
   SmallVector<unsigned, 8> VirtDead;
   SmallVector<MachineInstr*, 32> Coalesced;