commit b61a4aaca5f8a1e71eeaee74d93cdd6fccbef065
author Fangrui Song <maskray@google.com> Mon Feb 24 18:09:27 2020 -0800
committer Fangrui Song <maskray@google.com> Tue Feb 25 18:23:10 2020 -0800
tree 483f865c2f4d1cf9173915c1ffaf6f4aca0768dc
parent d0c4277d388628154b647a45cbc6914a1ea5a822

[MC] Default MCContext::UseNamesOnTempLabels to false and only set it to true for MCAsmStreamer

Only MCAsmStreamer (assembly output) needs to keep names of temporary labels created by
MCContext::createTempSymbol().

This change made the rL236642 optimization available for cc2as and
probably some other users.

This eliminates a behavior difference between llvm-mc -filetype=obj and cc1as, which caused
https://reviews.llvm.org/D74006#1890487

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D75097

llvm/lib/MC/MCAsmStreamer.cpp

diff --git a/llvm/lib/MC/MCAsmStreamer.cpp b/llvm/lib/MC/MCAsmStreamer.cpp
index 9281584..3792655 100644
--- a/llvm/lib/MC/MCAsmStreamer.cpp
+++ b/llvm/lib/MC/MCAsmStreamer.cpp
@@ -79,6 +79,8 @@
         InstPrinter->setCommentStream(CommentStream);
     if (Assembler->getBackendPtr())
       setAllowAutoPadding(Assembler->getBackend().allowAutoPadding());
+
+    Context.setUseNamesOnTempLabels(true);
   }
 
   MCAssembler &getAssembler() { return *Assembler; }