add a beta option for turning on dag->dag isel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22837 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCTargetMachine.cpp b/lib/Target/PowerPC/PPCTargetMachine.cpp
index e1f29ba..18c7fdc 100644
--- a/lib/Target/PowerPC/PPCTargetMachine.cpp
+++ b/lib/Target/PowerPC/PPCTargetMachine.cpp
@@ -30,8 +30,11 @@
using namespace llvm;
namespace {
- const std::string PPC32ID = "PowerPC/32bit";
+ const char *PPC32ID = "PowerPC/32bit";
+ static cl::opt<bool> EnablePPCDAGDAG("enable-ppc-dag-isel", cl::Hidden,
+ cl::desc("Enable DAG-to-DAG isel for PPC (beta)"));
+
// Register the targets
RegisterTarget<PPC32TargetMachine>
X("ppc32", " PowerPC 32-bit");
@@ -81,8 +84,11 @@
// Make sure that no unreachable blocks are instruction selected.
PM.add(createUnreachableBlockEliminationPass());
- // Default to pattern ISel
- if (PatternISelTriState == 0) {
+ // Install an instruction selector.
+ if (EnablePPCDAGDAG) {
+ PM.add(createPPC32ISelDag(*this));
+
+ } else if (PatternISelTriState == 0) {
PM.add(createLowerConstantExpressionsPass());
PM.add(createPPC32ISelSimple(*this));
} else