Generate DEBUG_VALUE comments on x86. The (limited)

dbg.declare's we currently generate go through both
register allocators without perturbing the results.

llvm-svn: 94480

2 files changed, 13 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
index 09fd657fffd..b7dbd03fc3a 100644
--- a/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -343,6 +343,9 @@ bool FastISel::SelectCall(User *I) {
       if (MDNode *Dbg = DI->getMetadata("dbg"))
         MMI->setVariableDbgInfo(DI->getVariable(), FI, Dbg);
     }
+    // Building the map above is target independent.  Generating DEBUG_VALUE
+    // inline is target dependent; do this now.
+    (void)TargetSelectInstruction(cast<Instruction>(I));
     return true;
   }
   case Intrinsic::eh_exception: {
diff --git a/llvm/lib/Target/X86/X86FastISel.cpp b/llvm/lib/Target/X86/X86FastISel.cpp
index d5ad61b2666..94dec7ce355 100644
--- a/llvm/lib/Target/X86/X86FastISel.cpp
+++ b/llvm/lib/Target/X86/X86FastISel.cpp
@@ -1153,6 +1153,16 @@ bool X86FastISel::X86VisitIntrinsicCall(IntrinsicInst &I) {
   // FIXME: Handle more intrinsics.
   switch (I.getIntrinsicID()) {
   default: return false;
+  case Intrinsic::dbg_declare: {
+    DbgDeclareInst *DI = cast<DbgDeclareInst>(&I);
+    X86AddressMode AM;
+    if (!X86SelectAddress(DI->getAddress(), AM))
+      return false;
+    const TargetInstrDesc &II = TII.get(TargetInstrInfo::DEBUG_VALUE);
+    addFullAddress(BuildMI(MBB, DL, II), AM).addImm(0).
+                                        addMetadata(DI->getVariable());
+    return true;
+  }
   case Intrinsic::trap: {
     BuildMI(MBB, DL, TII.get(X86::TRAP));
     return true;