1 files changed, 12 insertions, 0 deletions
diff --git a/llvm/lib/MC/MCObjectStreamer.cpp b/llvm/lib/MC/MCObjectStreamer.cpp
index e9295f0..7036c40 100644
--- a/llvm/lib/MC/MCObjectStreamer.cpp
+++ b/llvm/lib/MC/MCObjectStreamer.cpp
@@ -464,6 +464,18 @@ void MCObjectStreamer::emitDwarfAdvanceLineAddr(int64_t LineDelta,
                          Label, PointerSize);
     return;
   }
+
+  // If the two labels are within the same fragment, then the address-offset is
+  // already a fixed constant and is not relaxable. Emit the advance-line-addr
+  // data immediately to save time and memory.
+  if (auto OptAddrDelta = absoluteSymbolDiff(Label, LastLabel)) {
+    SmallString<16> Tmp;
+    MCDwarfLineAddr::encode(getContext(), Assembler->getDWARFLinetableParams(),
+                            LineDelta, *OptAddrDelta, Tmp);
+    emitBytes(Tmp);
+    return;
+  }
+
   const MCExpr *AddrDelta = buildSymbolDiff(*this, Label, LastLabel, SMLoc());
   insert(getContext().allocFragment<MCDwarfLineAddrFragment>(LineDelta,
                                                              *AddrDelta));