Don't add DBG_VALUE instructions for static allocas in dbg.declare

Summary:
An llvm.dbg.declare of a static alloca is always added to the
MachineFunction dbg variable map, so these values are entirely
redundant. They survive all the way through codegen to be ignored by
DWARF emission.

Effectively revert r113967

Two bugpoint-reduced test cases from 2012 broke as a result of this
change. Despite my best efforts, I haven't been able to rewrite the test
case using dbg.value. I'm not too concerned about the lost coverage
because these were reduced from the test-suite, which we still run.

Reviewers: aprantl, dblaikie

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D32920

llvm-svn: 302461

1 files changed, 0 insertions, 14 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 50313e2da88..6aa755df147 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -4957,20 +4957,6 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
       // virtual register info from the FuncInfo.ValueMap.
       if (!EmitFuncArgumentDbgValue(Address, Variable, Expression, dl, 0, true,
                                     N)) {
-        // If variable is pinned by a alloca in dominating bb then
-        // use StaticAllocaMap.
-        if (const AllocaInst *AI = dyn_cast<AllocaInst>(Address)) {
-          if (AI->getParent() != DI.getParent()) {
-            DenseMap<const AllocaInst*, int>::iterator SI =
-              FuncInfo.StaticAllocaMap.find(AI);
-            if (SI != FuncInfo.StaticAllocaMap.end()) {
-              SDV = DAG.getFrameIndexDbgValue(Variable, Expression, SI->second,
-                                              0, dl, SDNodeOrder);
-              DAG.AddDbgValue(SDV, nullptr, false);
-              return nullptr;
-            }
-          }
-        }
         DEBUG(dbgs() << "Dropping debug info for " << DI << "\n");
       }
     }