MC: Skip names of temporary symbols in object streamer
Don't create names for temporary symbols when using an object streamer.
The names never make it to the output anyway. From the starting point
of r236629, my heap profile says this drops peak memory usage from 1100
MB to 1058 MB for CodeGen of `verify-uselistorder`, a savings of almost
4% on peak memory, and removes `StringMap<bool, BumpPtrAllocator...>`
from the profile entirely.
(I'm looking at `llc` memory usage on `verify-uselistorder.lto.opt.bc`;
see r236629 for details.)
llvm-svn: 236642
diff --git a/llvm/lib/CodeGen/LLVMTargetMachine.cpp b/llvm/lib/CodeGen/LLVMTargetMachine.cpp
index 61d68f6..610c9f4 100644
--- a/llvm/lib/CodeGen/LLVMTargetMachine.cpp
+++ b/llvm/lib/CodeGen/LLVMTargetMachine.cpp
@@ -198,6 +198,9 @@
if (!MCE || !MAB)
return true;
+ // Don't waste memory on names of temp labels.
+ Context->setUseNamesOnTempLabels(false);
+
Triple T(getTargetTriple());
AsmStreamer.reset(getTarget().createMCObjectStreamer(
T, *Context, *MAB, Out, MCE, STI, Options.MCOptions.MCRelaxAll,