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IR: Use SmallVector instead of std::vector of TrackingMDRef

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Don't use std::vector<TrackingMDRef>, since (at least in some versions
of libc++) std::vector apparently copies values on grow operations
instead of moving them.  Found this when I was temporarily deleting the
copy constructor for TrackingMDRef to investigate a performance
bottleneck.

llvm-svn: 266909
This commit is contained in:
Duncan P. N. Exon Smith
2016-04-20 20:14:09 +00:00
parent 07320e4030
commit 3c406c2da5
3 changed files with 12 additions and 3 deletions
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2
llvm/lib/IR/DIBuilder.cpp
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@@ -614,7 +614,7 @@ DIGlobalVariable *DIBuilder::createTempGlobalVariableFwdDecl(
static DILocalVariable *createLocalVariable(
LLVMContext &VMContext,
DenseMap<MDNode *, std::vector<TrackingMDNodeRef>> &PreservedVariables,
DenseMap<MDNode *, SmallVector<TrackingMDNodeRef, 1>> &PreservedVariables,
DIScope *Scope, StringRef Name, unsigned ArgNo, DIFile *File,
unsigned LineNo, DIType *Ty, bool AlwaysPreserve, unsigned Flags) {
// FIXME: Why getNonCompileUnitScope()?