More malloc elimination: it's a bad idea to use raw_svector_ostream on a

small heap-allocated SmallString because it unconditionally forces a malloc.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129688 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/MC/MCObjectStreamer.cpp b/lib/MC/MCObjectStreamer.cpp
index ef22eaaaa49836016cbaf1758d5def219c3a8cac..9fe6823cb7ad4e1d9cf1bc6418263275dc9e9585 100644 (file)
--- a/lib/MC/MCObjectStreamer.cpp
+++ b/lib/MC/MCObjectStreamer.cpp
@@ -191,8 +191,10 @@ void MCObjectStreamer::EmitInstruction(const MCInst &Inst) {
 void MCObjectStreamer::EmitInstToFragment(const MCInst &Inst) {
   MCInstFragment *IF = new MCInstFragment(Inst, getCurrentSectionData());
 
-  raw_svector_ostream VecOS(IF->getCode());
+  SmallString<128> Code;
+  raw_svector_ostream VecOS(Code);
   getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, IF->getFixups());
+  IF->getCode().append(Code.begin(), Code.end());
 }
 
 static const MCExpr *BuildSymbolDiff(MCContext &Context,