[llvm] r300428 - MemorySSA: Stop tracking def-or-use blocks.

[Bryant Wong via llvm-commits]

Author: bryant
Date: Sun Apr 16 14:45:51 2017
New Revision: 300428

URL: http://llvm.org/viewvc/llvm-project?rev=300428&view=rev
Log:
MemorySSA: Stop tracking def-or-use blocks.

The tracking is unused, since MemoryPhis are not pruned as of r282419.

Differential Revision: https://reviews.llvm.org/D32121

Modified:
    llvm/trunk/lib/Analysis/MemorySSA.cpp

Modified: llvm/trunk/lib/Analysis/MemorySSA.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/MemorySSA.cpp?rev=300428&r1=300427&r2=300428&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/MemorySSA.cpp (original)
+++ llvm/trunk/lib/Analysis/MemorySSA.cpp Sun Apr 16 14:45:51 2017
@@ -1291,7 +1291,6 @@ void MemorySSA::buildMemorySSA() {
   // could just look up the memory access for every possible instruction in the
   // stream.
   SmallPtrSet<BasicBlock *, 32> DefiningBlocks;
-  SmallPtrSet<BasicBlock *, 32> DefUseBlocks;
   // Go through each block, figure out where defs occur, and chain together all
   // the accesses.
   for (BasicBlock &B : F) {
@@ -1316,8 +1315,6 @@ void MemorySSA::buildMemorySSA() {
     }
     if (InsertIntoDef)
       DefiningBlocks.insert(&B);
-    if (Accesses)
-      DefUseBlocks.insert(&B);
   }
   placePHINodes(DefiningBlocks, BBNumbers);