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| author | Owen Anderson <resistor@mac.com> | 2008-06-24 21:58:29 +0000 |
|---|---|---|
| committer | Owen Anderson <resistor@mac.com> | 2008-06-24 21:58:29 +0000 |
| commit | 45e39589411c8dfd625b71daba674b11286ea512 (patch) | |
| tree | 554d3e6aac79e72d1ff76791579c90a2fb3b0035 /lib/VMCore/Constants.cpp | |
| parent | 873e1b56427eee7879168b50cca8a85b04f18093 (diff) | |
| download | external_llvm-45e39589411c8dfd625b71daba674b11286ea512.zip external_llvm-45e39589411c8dfd625b71daba674b11286ea512.tar.gz external_llvm-45e39589411c8dfd625b71daba674b11286ea512.tar.bz2 | |
In ConstantArray::getAsString(), we know the size of the resultant string in advance so we can pre-allocate it and just fill in
the entries. This improves the time for the AsmPrinter on InstructionCombining.cpp from 0.4248s to 0.3370s.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52690 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/VMCore/Constants.cpp')
| -rw-r--r-- | lib/VMCore/Constants.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/VMCore/Constants.cpp b/lib/VMCore/Constants.cpp index e6398a3..39c0a8c 100644 --- a/lib/VMCore/Constants.cpp +++ b/lib/VMCore/Constants.cpp @@ -1378,8 +1378,9 @@ bool ConstantArray::isCString() const { std::string ConstantArray::getAsString() const { assert(isString() && "Not a string!"); std::string Result; + Result.reserve(getNumOperands()); for (unsigned i = 0, e = getNumOperands(); i != e; ++i) - Result += (char)cast<ConstantInt>(getOperand(i))->getZExtValue(); + Result[i] = (char)cast<ConstantInt>(getOperand(i))->getZExtValue(); return Result; } |