Change ScheduleDAGInstrs::Defs and ::Uses to be variable-size vectors

instead of fixed size arrays, so that increasing FirstVirtualRegister to 16K
won't cause a compile time performance regression.

llvm-svn: 109330

2 files changed, 4 insertions, 3 deletions

diff --git a/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp b/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp
index 40670da56e1..ea93dd5c666 100644
--- a/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp
+++ b/llvm/lib/CodeGen/ScheduleDAGInstrs.cpp
@@ -32,7 +32,8 @@ using namespace llvm;
 ScheduleDAGInstrs::ScheduleDAGInstrs(MachineFunction &mf,
                                      const MachineLoopInfo &mli,
                                      const MachineDominatorTree &mdt)
-  : ScheduleDAG(mf), MLI(mli), MDT(mdt), LoopRegs(MLI, MDT) {
+  : ScheduleDAG(mf), MLI(mli), MDT(mdt), Defs(TRI->getNumRegs()),
+    Uses(TRI->getNumRegs()), LoopRegs(MLI, MDT) {
   MFI = mf.getFrameInfo();
   DbgValueVec.clear();
 }
diff --git a/llvm/lib/CodeGen/ScheduleDAGInstrs.h b/llvm/lib/CodeGen/ScheduleDAGInstrs.h
index d90659bb163..c8f543f7146 100644
--- a/llvm/lib/CodeGen/ScheduleDAGInstrs.h
+++ b/llvm/lib/CodeGen/ScheduleDAGInstrs.h
@@ -106,8 +106,8 @@ namespace llvm {
     /// are as we iterate upward through the instructions. This is allocated
     /// here instead of inside BuildSchedGraph to avoid the need for it to be
     /// initialized and destructed for each block.
-    std::vector<SUnit *> Defs[TargetRegisterInfo::FirstVirtualRegister];
-    std::vector<SUnit *> Uses[TargetRegisterInfo::FirstVirtualRegister];
+    std::vector<std::vector<SUnit *> > Defs;
+    std::vector<std::vector<SUnit *> > Uses;
  
     /// DbgValueVec - Remember DBG_VALUEs that refer to a particular
     /// register.