Use std::vector instead of a hard-coded array. The length of that array could
get *very* large, but we only need it to be the size of thenumber of pregs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108411 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CriticalAntiDepBreaker.cpp b/lib/CodeGen/CriticalAntiDepBreaker.cpp
index e3746a9..9d48665 100644
--- a/lib/CodeGen/CriticalAntiDepBreaker.cpp
+++ b/lib/CodeGen/CriticalAntiDepBreaker.cpp
@@ -34,6 +34,9 @@
TRI(MF.getTarget().getRegisterInfo()),
AllocatableSet(TRI->getAllocatableSet(MF))
{
+ Classes.reserve(TRI->getNumRegs());
+ KillIndices.reserve(TRI->getNumRegs());
+ DefIndices.reserve(TRI->getNumRegs());
}
CriticalAntiDepBreaker::~CriticalAntiDepBreaker() {
@@ -41,8 +44,7 @@
void CriticalAntiDepBreaker::StartBlock(MachineBasicBlock *BB) {
// Clear out the register class data.
- std::fill(Classes, array_endof(Classes),
- static_cast<const TargetRegisterClass *>(0));
+ Classes.clear();
// Initialize the indices to indicate that no registers are live.
const unsigned BBSize = BB->size();