add cmd line option to leave dbgvalues in during post-RA sceduling. Useful
while debugging what's mishandled about them in the post-RA pass.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103805 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/PostRASchedulerList.cpp b/lib/CodeGen/PostRASchedulerList.cpp
index d3e1295..4f1e04b 100644
--- a/lib/CodeGen/PostRASchedulerList.cpp
+++ b/lib/CodeGen/PostRASchedulerList.cpp
@@ -80,6 +80,12 @@
cl::desc("Debug control MBBs that are scheduled"),
cl::init(0), cl::Hidden);
+static cl::opt<bool>
+EnablePostRADbgValue("post-RA-dbg-value",
+ cl::desc("Enable processing of dbg_value in post-RA"),
+ cl::init(false), cl::Hidden);
+
+
AntiDepBreaker::~AntiDepBreaker() { }
namespace {
@@ -269,11 +275,14 @@
// scheduler has some sort of problem with DebugValue instructions that
// causes an assertion in LeaksContext.h to fail occasionally. Just
// remove all those instructions for now.
- for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end();
- I != E; ) {
- MachineInstr *MI = &*I++;
- if (MI->isDebugValue())
- MI->eraseFromParent();
+ if (!EnablePostRADbgValue) {
+ DEBUG(dbgs() << "*** Maintaining DbgValues in PostRAScheduler\n");
+ for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end();
+ I != E; ) {
+ MachineInstr *MI = &*I++;
+ if (MI->isDebugValue())
+ MI->eraseFromParent();
+ }
}
// Schedule each sequence of instructions not interrupted by a label