From 820372c0edfacecae45a30d19929d73fb29f8cd3 Mon Sep 17 00:00:00 2001
From: Dehao Chen <dehao@google.com>
Date: Fri, 2 Sep 2016 01:47:13 +0000
Subject: revert r280432:

r280432 | dehao | 2016-09-01 16:51:37 -0700 (Thu, 01 Sep 2016) | 9 lines

Explicitly require DominatorTreeAnalysis pass for instsimplify pass.

Summary: DominatorTreeAnalysis is always required by instsimplify.
llvm-svn: 280452
---
 llvm/lib/Transforms/Utils/SimplifyInstructions.cpp | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

(limited to 'llvm/lib/Transforms/Utils')

diff --git a/llvm/lib/Transforms/Utils/SimplifyInstructions.cpp b/llvm/lib/Transforms/Utils/SimplifyInstructions.cpp
index 0be0b65e20a..3099c498a7c 100644
--- a/llvm/lib/Transforms/Utils/SimplifyInstructions.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyInstructions.cpp
@@ -90,7 +90,6 @@ namespace {
 
     void getAnalysisUsage(AnalysisUsage &AU) const override {
       AU.setPreservesCFG();
-      AU.addRequired<DominatorTreeWrapperPass>();
       AU.addRequired<AssumptionCacheTracker>();
       AU.addRequired<TargetLibraryInfoWrapperPass>();
     }
@@ -100,8 +99,9 @@ namespace {
       if (skipFunction(F))
         return false;
 
-      const DominatorTree *DT =
-          &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
+      const DominatorTreeWrapperPass *DTWP =
+          getAnalysisIfAvailable<DominatorTreeWrapperPass>();
+      const DominatorTree *DT = DTWP ? &DTWP->getDomTree() : nullptr;
       const TargetLibraryInfo *TLI =
           &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
       AssumptionCache *AC =
@@ -115,7 +115,6 @@ char InstSimplifier::ID = 0;
 INITIALIZE_PASS_BEGIN(InstSimplifier, "instsimplify",
                       "Remove redundant instructions", false, false)
 INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
-INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
 INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
 INITIALIZE_PASS_END(InstSimplifier, "instsimplify",
                     "Remove redundant instructions", false, false)
@@ -128,10 +127,10 @@ FunctionPass *llvm::createInstructionSimplifierPass() {
 
 PreservedAnalyses InstSimplifierPass::run(Function &F,
                                       FunctionAnalysisManager &AM) {
-  auto &DT = AM.getResult<DominatorTreeAnalysis>(F);
+  auto *DT = AM.getCachedResult<DominatorTreeAnalysis>(F);
   auto &TLI = AM.getResult<TargetLibraryAnalysis>(F);
   auto &AC = AM.getResult<AssumptionAnalysis>(F);
-  bool Changed = runImpl(F, &DT, &TLI, &AC);
+  bool Changed = runImpl(F, DT, &TLI, &AC);
   if (!Changed)
     return PreservedAnalyses::all();
   // FIXME: This should also 'preserve the CFG'.
-- 
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