guiyanakuang commented on a change in pull request #958:
URL: https://github.com/apache/orc/pull/958#discussion_r742480546
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File path: c++/src/LzoDecompressor.cc
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@@ -312,13 +312,11 @@ namespace orc {
output += SIZE_OF_INT;
matchAddress += increment32;
- *reinterpret_cast<int32_t*>(output) =
- *reinterpret_cast<int32_t*>(matchAddress);
+ memcpy(output, matchAddress, SIZE_OF_INT);
Review comment:
> The combination of `reinterpret_cast` + `assignment` looks cheaper
than `memcpy` function invocation. I'm wondering if we need to pay some
performance penalty here.
I'll do some performance tests later, `repeat_cast` + `assignment` makes
direct use of registers, `memcpy` is usually used for larger copies of data,
I'm not sure if it's lossy yet
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