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BitcodeReader: Use std:::piecewise_construct when upgrading type refs

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r267296 used std::piecewise_construct without using
std::forward_as_tuple, and r267298 hacked it out (using an emplace_back
followed by a couple of reset() calls) because of a problem on a bot.
I'm finally circling back to call forward_as_tuple as I should have to
begin with (thanks to David Blaikie for pointing out the missing piece).

Note that this code uses emplace_back() instead of
push_back(make_pair()) because the move constructor for TrackingMDRef is
expensive (cheaper than a copy, but still expensive).

llvm-svn: 272306
This commit is contained in:
Duncan P. N. Exon Smith 2016-06-09 20:46:33 +00:00
parent 01d87ac7ba
commit 969e6070d4
1 changed files with 3 additions and 3 deletions
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6
lib/Bitcode/Reader/BitcodeReader.cpp
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@ -1238,9 +1238,9 @@ Metadata *BitcodeReaderMetadataList::upgradeTypeRefArray(Metadata *MaybeTuple) {
// Create and return a placeholder to use for now. Eventually
// resolveTypeRefArrays() will be resolve this forward reference.
OldTypeRefs.Arrays.emplace_back();
OldTypeRefs.Arrays.back().first.reset(Tuple);
OldTypeRefs.Arrays.back().second = MDTuple::getTemporary(Context, None);
OldTypeRefs.Arrays.emplace_back(
std::piecewise_construct, std::forward_as_tuple(Tuple),
std::forward_as_tuple(MDTuple::getTemporary(Context, None)));
return OldTypeRefs.Arrays.back().second.get();
}