From e93198af07517b92f276192c974ce3a6006ce998 Mon Sep 17 00:00:00 2001
From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Wed, 10 Nov 2010 23:55:56 +0000
Subject: [PATCH] Hook up AliasAnalysis in InlineSpiller. This is used for
 rematerializing constant loads.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118741 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/InlineSpiller.cpp      | 5 ++++-
 lib/CodeGen/RegAllocLinearScan.cpp | 4 ++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/CodeGen/InlineSpiller.cpp b/lib/CodeGen/InlineSpiller.cpp
index f19b1754f76..0e8f302b6a0 100644
--- a/lib/CodeGen/InlineSpiller.cpp
+++ b/lib/CodeGen/InlineSpiller.cpp
@@ -17,6 +17,7 @@
 #include "LiveRangeEdit.h"
 #include "SplitKit.h"
 #include "VirtRegMap.h"
+#include "llvm/Analysis/AliasAnalysis.h"
 #include "llvm/CodeGen/LiveIntervalAnalysis.h"
 #include "llvm/CodeGen/LiveStackAnalysis.h"
 #include "llvm/CodeGen/MachineDominators.h"
@@ -47,6 +48,7 @@ class InlineSpiller : public Spiller {
   LiveStacks &lss_;
   MachineDominatorTree &mdt_;
   MachineLoopInfo &loops_;
+  AliasAnalysis *aa_;
   VirtRegMap &vrm_;
   MachineFrameInfo &mfi_;
   MachineRegisterInfo &mri_;
@@ -76,6 +78,7 @@ public:
       lss_(pass.getAnalysis<LiveStacks>()),
       mdt_(pass.getAnalysis<MachineDominatorTree>()),
       loops_(pass.getAnalysis<MachineLoopInfo>()),
+      aa_(&pass.getAnalysis<AliasAnalysis>()),
       vrm_(vrm),
       mfi_(*mf.getFrameInfo()),
       mri_(mf.getRegInfo()),
@@ -219,7 +222,7 @@ bool InlineSpiller::reMaterializeFor(MachineBasicBlock::iterator MI) {
 /// and trim the live ranges after.
 void InlineSpiller::reMaterializeAll() {
   // Do a quick scan of the interval values to find if any are remattable.
-  if (!edit_->anyRematerializable(lis_, tii_, 0))
+  if (!edit_->anyRematerializable(lis_, tii_, aa_))
     return;
 
   usedValues_.clear();
diff --git a/lib/CodeGen/RegAllocLinearScan.cpp b/lib/CodeGen/RegAllocLinearScan.cpp
index 947a6c74bd1..81b9070af29 100644
--- a/lib/CodeGen/RegAllocLinearScan.cpp
+++ b/lib/CodeGen/RegAllocLinearScan.cpp
@@ -15,6 +15,7 @@
 #include "VirtRegMap.h"
 #include "VirtRegRewriter.h"
 #include "Spiller.h"
+#include "llvm/Analysis/AliasAnalysis.h"
 #include "llvm/Function.h"
 #include "llvm/CodeGen/CalcSpillWeights.h"
 #include "llvm/CodeGen/LiveIntervalAnalysis.h"
@@ -193,6 +194,8 @@ namespace {
 
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.setPreservesCFG();
+      AU.addRequired<AliasAnalysis>();
+      AU.addPreserved<AliasAnalysis>();
       AU.addRequired<LiveIntervals>();
       AU.addPreserved<SlotIndexes>();
       if (StrongPHIElim)
@@ -391,6 +394,7 @@ INITIALIZE_PASS_DEPENDENCY(LiveStacks)
 INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo)
 INITIALIZE_PASS_DEPENDENCY(VirtRegMap)
 INITIALIZE_AG_DEPENDENCY(RegisterCoalescer)
+INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
 INITIALIZE_PASS_END(RALinScan, "linearscan-regalloc",
                 "Linear Scan Register Allocator", false, false)
 
-- 
2.34.1