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Update ShiftAnalysis
authored
Jul 13, 2018
by
Chris Cox
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ShiftAnalysis.md
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A common operation, that should be well recognized and optimized... or so you would imagine.
*
[
MacOS/LLVM results
](
https://gitlab.com/chriscox/CppPerformanceBenchmarks/wikis/ShiftAnalysis#macosllvm
)
*
[
Windows/MSVC results
](
https://gitlab.com/chriscox/CppPerformanceBenchmarks/wikis/ShiftAnalysis#windowsmsvc
)
*
[
Ubuntu/gccc results
](
https://gitlab.com/chriscox/CppPerformanceBenchmarks/wikis/ShiftAnalysis#linuxgcc
)
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## MacOS/LLVM
```
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@@ -611,4 +616,4 @@ number time per second test0
6 "uint64_t variable mask high" 49.25 sec 974.53 M 2.42
7 "uint64_t variable mask high by shift" 49.34 sec 972.80 M 2.42
```
*
Again incredibly slow and difficult to tell if anything is being optimized.
*
Again incredibly slow and difficult to tell if anything is being optimized.
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