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[TableGen] Change std::vector to SmallVector

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The size of VTList that is pushed into this container is usually 1, but
often 6 or 7. Change the vector to SmallVector to eliminate frequent
mallocs.  This happens hundreds of thousands of times in each tablegen
execution during the LLVM/clang build.

https://reviews.llvm.org/D83849
This commit is contained in:
Nadav Rotem 2020-07-15 22:36:32 -07:00
parent 51efd8682f
commit 8c87e8c6cf
1 changed files with 1 additions and 1 deletions
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2
utils/TableGen/CodeGenDAGPatterns.h
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@ -190,7 +190,7 @@ private:
struct TypeSetByHwMode : public InfoByHwMode<MachineValueTypeSet> {
using SetType = MachineValueTypeSet;
std::vector<unsigned> AddrSpaces;
SmallVector<unsigned, 16> AddrSpaces;
TypeSetByHwMode() = default;
TypeSetByHwMode(const TypeSetByHwMode &VTS) = default;