ARM: track globals promoted to coalesced const pool entries

Globals that are promoted to an ARM constant pool may alias with another
existing constant pool entry. We need to keep a reference to all globals
that were promoted to each constant pool value so that we can emit a
distinct label for each promoted global. These labels are necessary so
that debug info can refer to the promoted global without an undefined
reference during linking.

Patch by Stephen Crane!

llvm-svn: 312692

1 files changed, 6 insertions, 5 deletions

diff --git a/llvm/lib/Target/ARM/ARMAsmPrinter.cpp b/llvm/lib/Target/ARM/ARMAsmPrinter.cpp
index 8e425ddcdad..13335a84f6d 100644
--- a/llvm/lib/Target/ARM/ARMAsmPrinter.cpp
+++ b/llvm/lib/Target/ARM/ARMAsmPrinter.cpp
@@ -865,11 +865,12 @@ EmitMachineConstantPoolValue(MachineConstantPoolValue *MCPV) {
     // However, if this global is promoted into several functions we must ensure
     // we don't try and emit duplicate symbols!
     auto *ACPC = cast<ARMConstantPoolConstant>(ACPV);
-    auto *GV = ACPC->getPromotedGlobal();
-    if (!EmittedPromotedGlobalLabels.count(GV)) {
-      MCSymbol *GVSym = getSymbol(GV);
-      OutStreamer->EmitLabel(GVSym);
-      EmittedPromotedGlobalLabels.insert(GV);
+    for (const auto *GV : ACPC->promotedGlobals()) {
+      if (!EmittedPromotedGlobalLabels.count(GV)) {
+        MCSymbol *GVSym = getSymbol(GV);
+        OutStreamer->EmitLabel(GVSym);
+        EmittedPromotedGlobalLabels.insert(GV);
+      }
     }
     return EmitGlobalConstant(DL, ACPC->getPromotedGlobalInit());
   }