+std::pair<MachineInstr::mmo_iterator, unsigned>
+MachineInstr::mergeMemRefsWith(const MachineInstr& Other) {
+ // TODO: If we end up with too many memory operands, return the empty
+ // conservative set rather than failing asserts.
+ // TODO: consider uniquing elements within the operand lists to reduce
+ // space usage and fall back to conservative information less often.
+ size_t CombinedNumMemRefs = (memoperands_end() - memoperands_begin())
+ + (Other.memoperands_end() - Other.memoperands_begin());
+
+ MachineFunction *MF = getParent()->getParent();
+ mmo_iterator MemBegin = MF->allocateMemRefsArray(CombinedNumMemRefs);
+ mmo_iterator MemEnd = std::copy(memoperands_begin(), memoperands_end(),
+ MemBegin);
+ MemEnd = std::copy(Other.memoperands_begin(), Other.memoperands_end(),
+ MemEnd);
+ assert(MemEnd - MemBegin == CombinedNumMemRefs && "missing memrefs");
+
+ return std::make_pair(MemBegin, CombinedNumMemRefs);
+}
+