Add hidden -verify-coalescing to run the machine code verifier before and after

register coalescing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123890 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp
index ac11dfd2bb0727320f0ca045ffc30264a7ff0244..e616d3536fe91d57f6b40b32cd0a13e21298c969 100644 (file)
--- a/lib/CodeGen/SimpleRegisterCoalescing.cpp
+++ b/lib/CodeGen/SimpleRegisterCoalescing.cpp
@@ -65,6 +65,11 @@ DisablePhysicalJoin("disable-physical-join",
                cl::desc("Avoid coalescing physical register copies"),
                cl::init(false), cl::Hidden);
 
+static cl::opt<bool>
+VerifyCoalescing("verify-coalescing",
+         cl::desc("Verify machine instrs before and after register coalescing"),
+         cl::Hidden);
+
 INITIALIZE_AG_PASS_BEGIN(SimpleRegisterCoalescing, RegisterCoalescer,
                 "simple-register-coalescing", "Simple Register Coalescing", 
                 false, false, true)
@@ -1635,6 +1640,9 @@ bool SimpleRegisterCoalescing::runOnMachineFunction(MachineFunction &fn) {
                << "********** Function: "
                << ((Value*)mf_->getFunction())->getName() << '\n');
 
+  if (VerifyCoalescing)
+    mf_->verify(this, "Before register coalescing");
+
   for (TargetRegisterInfo::regclass_iterator I = tri_->regclass_begin(),
          E = tri_->regclass_end(); I != E; ++I)
     allocatableRCRegs_.insert(std::make_pair(*I,
@@ -1777,6 +1785,8 @@ bool SimpleRegisterCoalescing::runOnMachineFunction(MachineFunction &fn) {
 
   DEBUG(dump());
   DEBUG(ldv_->dump());
+  if (VerifyCoalescing)
+    mf_->verify(this, "After register coalescing");
   return true;
 }