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Replace push_back(Constructor(foo)) with emplace_back(foo) for non-trivial types

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If the type isn't trivially moveable emplace can skip a potentially
expensive move. It also saves a couple of characters.


Call sites were found with the ASTMatcher + some semi-automated cleanup.

memberCallExpr(
    argumentCountIs(1), callee(methodDecl(hasName("push_back"))),
    on(hasType(recordDecl(has(namedDecl(hasName("emplace_back")))))),
    hasArgument(0, bindTemporaryExpr(
                       hasType(recordDecl(hasNonTrivialDestructor())),
                       has(constructExpr()))),
    unless(isInTemplateInstantiation()))

No functional change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238602 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2015-05-29 19:43:39 +00:00
parent 071c3df378
commit 9589ff8949
42 changed files with 109 additions and 140 deletions
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2
lib/Analysis/AliasSetTracker.cpp
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@ -130,7 +130,7 @@ void AliasSet::addPointer(AliasSetTracker &AST, PointerRec &Entry,
void AliasSet::addUnknownInst(Instruction *I, AliasAnalysis &AA) {
if (UnknownInsts.empty())
addRef();
UnknownInsts.push_back(I);
UnknownInsts.emplace_back(I);
if (!I->mayWriteToMemory()) {
AliasTy = MayAlias;