AsmPrinter: Stop creating DebugLocs

While looking at a heap profile of a clang LTO bootstrap with -g, I
noticed that 2.2% of memory in an `llvm-lto` of clang is from calling
`DebugLoc::get()` in `collectVariableInfo()` (accounting for ~40% of
memory used for `MDLocation`s).

I suspect this was introduced by r226736, whose goal was to prevent
uniquing of `DebugLoc`s (goal achieved, if so).

There's no reason we need a `DebugLoc` here at all -- it was just being
used for (in)convenient API -- so the fix is to pass the scope and
inlined-at directly to `LexicalScopes::findInlinedScope()`.

llvm-svn: 229459

1 files changed, 0 insertions, 8 deletions

diff --git a/llvm/lib/CodeGen/LexicalScopes.cpp b/llvm/lib/CodeGen/LexicalScopes.cpp
index d71b0afdaec..9eaf7dafbe9 100644
--- a/llvm/lib/CodeGen/LexicalScopes.cpp
+++ b/llvm/lib/CodeGen/LexicalScopes.cpp
@@ -104,14 +104,6 @@ void LexicalScopes::extractLexicalScopes(
   }
 }
 
-LexicalScope *LexicalScopes::findInlinedScope(DebugLoc DL) {
-  MDNode *Scope = nullptr;
-  MDNode *IA = nullptr;
-  DL.getScopeAndInlinedAt(Scope, IA, MF->getFunction()->getContext());
-  auto I = InlinedLexicalScopeMap.find(std::make_pair(Scope, IA));
-  return I != InlinedLexicalScopeMap.end() ? &I->second : nullptr;
-}
-
 /// findLexicalScope - Find lexical scope, either regular or inlined, for the
 /// given DebugLoc. Return NULL if not found.
 LexicalScope *LexicalScopes::findLexicalScope(DebugLoc DL) {