Mark livein registers as being in used.

llvm-svn: 34525
2007-02-23 08:41:19 +00:00 · 2007-02-23 08:41:19 +00:00 · 584e051c28
parent 072d578bc2
commit 584e051c28
1 changed files with 6 additions and 0 deletions
--- a/llvm/lib/CodeGen/RegisterScavenging.cpp
+++ b/llvm/lib/CodeGen/RegisterScavenging.cpp
@ -43,6 +43,12 @@ RegScavenger::RegScavenger(MachineBasicBlock *mbb)
  if (CSRegs != NULL)
    for (unsigned i = 0; CSRegs[i]; ++i)
      CalleeSavedRegs.set(CSRegs[i]);
+
+  // Live-in registers are in use.
+  if (!MBB->livein_empty())
+    for (MachineBasicBlock::const_livein_iterator I = MBB->livein_begin(),
+           E = MBB->livein_end(); I != E; ++I)
+      setUsed(*I);
 }

 void RegScavenger::forward() {