#include "llvm/CodeGen/ValueTypes.h"
#include <cassert>
#include <functional>
+#include <set>
namespace llvm {
regclass_iterator RegClassBegin, RegClassEnd; // List of regclasses
int CallFrameSetupOpcode, CallFrameDestroyOpcode;
+ std::set<std::pair<unsigned, unsigned> > Subregs;
protected:
TargetRegisterInfo(const TargetRegisterDesc *D, unsigned NR,
regclass_iterator RegClassBegin,
/// isSubRegister - Returns true if regB is a sub-register of regA.
///
bool isSubRegister(unsigned regA, unsigned regB) const {
- for (const unsigned *SR = getSubRegisters(regA); *SR; ++SR)
- if (*SR == regB) return true;
- return false;
+ return Subregs.count(std::make_pair(regA, regB));
}
/// isSuperRegister - Returns true if regB is a super-register of regA.
CallFrameSetupOpcode = CFSO;
CallFrameDestroyOpcode = CFDO;
+
+ for (unsigned i = 0; i < NumRegs; ++i) {
+ const TargetRegisterDesc* CurrReg = Desc + i;
+
+ // Initialize the Subregs set, which stores pairs (a, b) where
+ // b is a subreg of a.
+ if (CurrReg->SubRegs)
+ for (const unsigned* CurrSR = CurrReg->SubRegs; *CurrSR; ++CurrSR)
+ Subregs.insert(std::make_pair(i, *CurrSR));
+ }
}
TargetRegisterInfo::~TargetRegisterInfo() {}