Revert "[MC] Remove UseAssemblerInfoForParsing"

This reverts commit 03c53c69a367008da689f0d2940e2197eb4a955c.

This causes very large compile-time regressions in some cases,
e.g. sqlite3 at O0 regresses by 5%.

1 files changed, 8 insertions, 1 deletions

diff --git a/llvm/lib/MC/MCObjectStreamer.cpp b/llvm/lib/MC/MCObjectStreamer.cpp
index a9003a1..d2da5d0 100644
--- a/llvm/lib/MC/MCObjectStreamer.cpp
+++ b/llvm/lib/MC/MCObjectStreamer.cpp
@@ -40,7 +40,14 @@ MCObjectStreamer::MCObjectStreamer(MCContext &Context,
 
 MCObjectStreamer::~MCObjectStreamer() = default;
 
-MCAssembler *MCObjectStreamer::getAssemblerPtr() { return Assembler.get(); }
+// AssemblerPtr is used for evaluation of expressions and causes
+// difference between asm and object outputs. Return nullptr to in
+// inline asm mode to limit divergence to assembly inputs.
+MCAssembler *MCObjectStreamer::getAssemblerPtr() {
+  if (getUseAssemblerInfoForParsing())
+    return Assembler.get();
+  return nullptr;
+}
 
 void MCObjectStreamer::addPendingLabel(MCSymbol* S) {
   MCSection *CurSection = getCurrentSectionOnly();