Simplify RegScavenger::FindUnusedReg.

- Drop the Candidates argument and fix all callers. Now that RegScavenger
  tracks available registers accurately, there is no need to restict the
  search.
- Make sure that no aliases of the found register are in use. This was a potential bug.

llvm-svn: 79369

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp b/llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp
index 2eb2abc0474..f120caaa42d 100644
--- a/llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp
+++ b/llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp
@@ -527,7 +527,7 @@ static
 unsigned findScratchRegister(MachineBasicBlock::iterator II, RegScavenger *RS,
                              const TargetRegisterClass *RC, int SPAdj) {
   assert(RS && "Register scavenging must be on");
-  unsigned Reg = RS->FindUnusedReg(RC, true);
+  unsigned Reg = RS->FindUnusedReg(RC);
   // FIXME: move ARM callee-saved reg scan to target independent code, then 
   // search for already spilled CS register here.
   if (Reg == 0)