private:
const TargetRegisterInfoDesc *InfoDesc; // Extra desc array for codegen
const char *const *SubRegIndexNames; // Names of subreg indexes.
+ // Pointer to array of lane masks, one per sub-reg index.
+ const unsigned *SubRegIndexLaneMasks;
+
regclass_iterator RegClassBegin, RegClassEnd; // List of regclasses
protected:
TargetRegisterInfo(const TargetRegisterInfoDesc *ID,
regclass_iterator RegClassBegin,
regclass_iterator RegClassEnd,
- const char *const *subregindexnames);
+ const char *const *SRINames,
+ const unsigned *SRILaneMasks);
virtual ~TargetRegisterInfo();
public:
/// getSubRegIndexName - Return the human-readable symbolic target-specific
/// name for the specified SubRegIndex.
const char *getSubRegIndexName(unsigned SubIdx) const {
- assert(SubIdx && "This is not a subregister index");
+ assert(SubIdx && SubIdx < getNumSubRegIndices() &&
+ "This is not a subregister index");
return SubRegIndexNames[SubIdx-1];
}
+ /// getSubRegIndexLaneMask - Return a bitmask representing the parts of a
+ /// register that are covered by SubIdx.
+ ///
+ /// Lane masks for sub-register indices are similar to register units for
+ /// physical registers. The individual bits in a lane mask can't be assigned
+ /// any specific meaning. They can be used to check if two sub-register
+ /// indices overlap.
+ ///
+ /// If the target has a register such that:
+ ///
+ /// getSubReg(Reg, A) overlaps getSubReg(Reg, B)
+ ///
+ /// then:
+ ///
+ /// getSubRegIndexLaneMask(A) & getSubRegIndexLaneMask(B) != 0
+ ///
+ /// The converse is not necessarily true. If two lane masks have a common
+ /// bit, the corresponding sub-registers may not overlap, but it can be
+ /// assumed that they usually will.
+ unsigned getSubRegIndexLaneMask(unsigned SubIdx) const {
+ // SubIdx == 0 is allowed, it has the lane mask ~0u.
+ assert(SubIdx < getNumSubRegIndices() && "This is not a subregister index");
+ return SubRegIndexLaneMasks[SubIdx];
+ }
+
/// regsOverlap - Returns true if the two registers are equal or alias each
/// other. The registers may be virtual register.
bool regsOverlap(unsigned regA, unsigned regB) const {
return false;
}
+ /// hasRegUnit - Returns true if Reg contains RegUnit.
+ bool hasRegUnit(unsigned Reg, unsigned RegUnit) const {
+ for (MCRegUnitIterator Units(Reg, this); Units.isValid(); ++Units)
+ if (*Units == RegUnit)
+ return true;
+ return false;
+ }
+
/// isSubRegister - Returns true if regB is a sub-register of regA.
///
bool isSubRegister(unsigned regA, unsigned regB) const {