#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Config/alloca.h"
+#include <algorithm>
using namespace llvm;
static RegisterAnalysis<LiveVariables> X("livevars", "Live Variable Analysis");
return VirtRegInfo[RegIdx];
}
+bool LiveVariables::KillsRegister(MachineInstr *MI, unsigned Reg) const {
+ std::map<MachineInstr*, std::vector<unsigned> >::const_iterator I =
+ RegistersKilled.find(MI);
+ if (I == RegistersKilled.end()) return false;
+
+ // Do a binary search, as these lists can grow pretty big, particularly for
+ // call instructions on targets with lots of call-clobbered registers.
+ return std::binary_search(I->second.begin(), I->second.end(), Reg);
+}
+
+bool LiveVariables::RegisterDefIsDead(MachineInstr *MI, unsigned Reg) const {
+ std::map<MachineInstr*, std::vector<unsigned> >::const_iterator I =
+ RegistersDead.find(MI);
+ if (I == RegistersDead.end()) return false;
+
+ // Do a binary search, as these lists can grow pretty big, particularly for
+ // call instructions on targets with lots of call-clobbered registers.
+ return std::binary_search(I->second.begin(), I->second.end(), Reg);
+}
void LiveVariables::MarkVirtRegAliveInBlock(VarInfo &VRInfo,
i + MRegisterInfo::FirstVirtualRegister);
}
+ // Walk through the RegistersKilled/Dead sets, and sort the registers killed
+ // or dead. This allows us to use efficient binary search for membership
+ // testing.
+ for (std::map<MachineInstr*, std::vector<unsigned> >::iterator
+ I = RegistersKilled.begin(), E = RegistersKilled.end(); I != E; ++I)
+ std::sort(I->second.begin(), I->second.end());
+ for (std::map<MachineInstr*, std::vector<unsigned> >::iterator
+ I = RegistersDead.begin(), E = RegistersDead.end(); I != E; ++I)
+ std::sort(I->second.begin(), I->second.end());
+
// Check to make sure there are no unreachable blocks in the MC CFG for the
// function. If so, it is due to a bug in the instruction selector or some
// other part of the code generator if this happens.