From 8d857660ce194f05eca3e21d149e8cf3101da9e4 Mon Sep 17 00:00:00 2001
From: Lang Hames <lhames@gmail.com>
Date: Fri, 17 Jun 2011 07:09:01 +0000
Subject: [PATCH] Add a hook for PBQP clients to run a custom pre-alloc pass to
 run prior to PBQP allocation. Patch by Arnaud Allard de Grandmaison.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133249 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/CodeGen/RegAllocPBQP.h |  3 ++-
 lib/CodeGen/RegAllocPBQP.cpp        | 13 +++++++++----
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/include/llvm/CodeGen/RegAllocPBQP.h b/include/llvm/CodeGen/RegAllocPBQP.h
index 8139c65c4b..bce3ec739b 100644
--- a/include/llvm/CodeGen/RegAllocPBQP.h
+++ b/include/llvm/CodeGen/RegAllocPBQP.h
@@ -161,7 +161,8 @@ namespace llvm {
                             PBQP::PBQPNum benefit);
   };
 
-  FunctionPass* createPBQPRegisterAllocator(std::auto_ptr<PBQPBuilder> builder);
+  FunctionPass* createPBQPRegisterAllocator(std::auto_ptr<PBQPBuilder> builder,
+                                            char *customPassID=0);
 }
 
 #endif /* LLVM_CODEGEN_REGALLOCPBQP_H */
diff --git a/lib/CodeGen/RegAllocPBQP.cpp b/lib/CodeGen/RegAllocPBQP.cpp
index 605507f014..49f8fb4c16 100644
--- a/lib/CodeGen/RegAllocPBQP.cpp
+++ b/lib/CodeGen/RegAllocPBQP.cpp
@@ -84,8 +84,8 @@ class RegAllocPBQP : public MachineFunctionPass {
   static char ID;
 
   /// Construct a PBQP register allocator.
-  RegAllocPBQP(std::auto_ptr<PBQPBuilder> b)
-      : MachineFunctionPass(ID), builder(b) {
+  RegAllocPBQP(std::auto_ptr<PBQPBuilder> b, char *cPassID=0)
+      : MachineFunctionPass(ID), builder(b), customPassID(cPassID) {
     initializeSlotIndexesPass(*PassRegistry::getPassRegistry());
     initializeLiveIntervalsPass(*PassRegistry::getPassRegistry());
     initializeRegisterCoalescerAnalysisGroup(*PassRegistry::getPassRegistry());
@@ -122,6 +122,8 @@ class RegAllocPBQP : public MachineFunctionPass {
 
   std::auto_ptr<PBQPBuilder> builder;
 
+  char *customPassID;
+
   MachineFunction *mf;
   const TargetMachine *tm;
   const TargetRegisterInfo *tri;
@@ -449,6 +451,8 @@ void RegAllocPBQP::getAnalysisUsage(AnalysisUsage &au) const {
   au.addRequired<LiveIntervals>();
   //au.addRequiredID(SplitCriticalEdgesID);
   au.addRequired<RegisterCoalescer>();
+  if (customPassID)
+    au.addRequiredID(*customPassID);
   au.addRequired<CalculateSpillWeights>();
   au.addRequired<LiveStacks>();
   au.addPreserved<LiveStacks>();
@@ -702,8 +706,9 @@ bool RegAllocPBQP::runOnMachineFunction(MachineFunction &MF) {
 }
 
 FunctionPass* llvm::createPBQPRegisterAllocator(
-                                           std::auto_ptr<PBQPBuilder> builder) {
-  return new RegAllocPBQP(builder);
+                                           std::auto_ptr<PBQPBuilder> builder,
+                                           char *customPassID) {
+  return new RegAllocPBQP(builder, customPassID);
 }
 
 FunctionPass* llvm::createDefaultPBQPRegisterAllocator() {