148   auto *Defs = MSSA->getWritableBlockDefs(MA->getBlock());  in getPreviousDefInBlock()  local
150   // It's possible there are no defs, or we got handed the first def to start.  in getPreviousDefInBlock()
151   if (Defs) {  in getPreviousDefInBlock()
156       if (Iter != Defs->rend())  in getPreviousDefInBlock()
164       // Note that if MA comes before Defs->begin(), we won't hit a def.  in getPreviousDefInBlock()
175   auto *Defs = MSSA->getWritableBlockDefs(BB);  in getPreviousDefFromEnd()  local
177   if (Defs) {  in getPreviousDefFromEnd()
178     CachedPreviousDef.insert({BB, &*Defs->rbegin()});  in getPreviousDefFromEnd()
179     return &*Defs->rbegin();  in getPreviousDefFromEnd()
244   // may-defs, there are only two cases:  in insertUse()
257     auto *Defs = MSSA->getBlockDefs(MU->getBlock());  in insertUse()  local
258     (void)Defs;  in insertUse()
259     assert((!Defs || (++Defs->begin() == Defs->end())) &&  in insertUse()
260            "Block may have only a Phi or no defs");  in insertUse()
267     if (auto *Defs = MSSA->getWritableBlockDefs(StartBlock)) {  in insertUse()  local
268       MemoryAccess *FirstDef = &*Defs->begin();  in insertUse()
304 // Then, we update the defs below us (and any new phi nodes) in the graph to
305 // point to the correct new defs, to ensure we only have one variable, and no
335       // Defs are automatically unoptimized when the user is set to MD below,  in insertDef()
431   // Now that all fixups are done, rename all uses if we are asked. The defs are  in insertDef()
453     // optimized and the inserted Defs "covers" the Optimized value.  in insertDef()
470     auto *Defs = MSSA->getWritableBlockDefs(NewDef->getBlock());  in fixupDefs()  local
478     if (++DefIter != Defs->end()) {  in fixupDefs()
497       if (auto *Defs = MSSA->getWritableBlockDefs(FixupBlock)) {  in fixupDefs()  local
498         auto *FirstDef = &*Defs->begin();  in fixupDefs()
718     // Update Uses and Defs.  in updateForClonedLoop()
733   // All defs/phis from outside BB that are used in BB, are valid uses in P1.  in updateForClonedBlockIntoPred()
734   // Since those defs/phis must have dominated BB, and also dominate P1.  in updateForClonedBlockIntoPred()
735   // Defs from BB being used in BB will be replaced with the cloned defs from  in updateForClonedBlockIntoPred()
847       MemorySSA::DefsList *Defs = MSSA->getWritableBlockDefs(BB);  in applyInsertUpdates()  local
849       if (Defs)  in applyInsertUpdates()
850         return &*(--Defs->end());  in applyInsertUpdates()
1010     // still compute blocks with defs to replace for this block below.  in applyInsertUpdates()
1023       // Check DefP1 against all Defs in LastDefPredPair. If all the same,  in applyInsertUpdates()
1106   // Now for all defs in BlocksWithDefsToReplace, if there are uses they no  in applyInsertUpdates()
1216   auto *Defs = MSSA->getWritableBlockDefs(From);  in moveAllAccesses()  local
1217   if (Defs && !Defs->empty())  in moveAllAccesses()
1218     if (auto *Phi = dyn_cast<MemoryPhi>(&*Defs->begin()))  in moveAllAccesses()