Added an option to have the PBQP allocator attempt coalescing during allocation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79397 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocPBQP.cpp b/lib/CodeGen/RegAllocPBQP.cpp
index 3da2553..227ce39 100644
--- a/lib/CodeGen/RegAllocPBQP.cpp
+++ b/lib/CodeGen/RegAllocPBQP.cpp
@@ -59,6 +59,11 @@
registerPBQPRepAlloc("pbqp", "PBQP register allocator.",
llvm::createPBQPRegisterAllocator);
+static cl::opt<bool>
+pbqpCoalescing("pbqp-coalescing",
+ cl::desc("Attempt coalescing during PBQP register allocation."),
+ cl::init(false), cl::Hidden);
+
namespace {
///
@@ -537,7 +542,11 @@
}
// Get the set of potential coalesces.
- CoalesceMap coalesces;//(findCoalesces());
+ CoalesceMap coalesces;
+
+ if (pbqpCoalescing) {
+ coalesces = findCoalesces();
+ }
// Construct a PBQP solver for this problem
PBQP::SimpleGraph problem;