Added -pbqp-pre-coalescing flag to PBQP. If enabled this will cause PBQP to require
LoopSplitter be run prior to register allocation.
Entirely for testing purposes at the moment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108634 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocPBQP.cpp b/lib/CodeGen/RegAllocPBQP.cpp
index a7ea8e7..ea2a02d 100644
--- a/lib/CodeGen/RegAllocPBQP.cpp
+++ b/lib/CodeGen/RegAllocPBQP.cpp
@@ -34,6 +34,7 @@
#include "PBQP/HeuristicSolver.h"
#include "PBQP/Graph.h"
#include "PBQP/Heuristics/Briggs.h"
+#include "Splitter.h"
#include "VirtRegMap.h"
#include "VirtRegRewriter.h"
#include "llvm/CodeGen/CalcSpillWeights.h"
@@ -65,6 +66,11 @@
cl::desc("Attempt coalescing during PBQP register allocation."),
cl::init(false), cl::Hidden);
+static cl::opt<bool>
+pbqpPreSplitting("pbqp-pre-splitting",
+ cl::desc("Pre-splite before PBQP register allocation."),
+ cl::init(false), cl::Hidden);
+
namespace {
///
@@ -96,6 +102,8 @@
au.addPreserved<LiveStacks>();
au.addRequired<MachineLoopInfo>();
au.addPreserved<MachineLoopInfo>();
+ if (pbqpPreSplitting)
+ au.addRequired<LoopSplitter>();
au.addRequired<VirtRegMap>();
MachineFunctionPass::getAnalysisUsage(au);
}