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May 12, 2023 · Relying instead on msvcrt.dll, an old dog that has not been improved over the past 25 years. Yes, it is that much slower for sin(). Microsoft made the "universal run time" (aka UCRT) available to help such projects break their dependency on msvcrt.dll but as yet MinGW has not taken advantage of it. –
Why are C++ trigonometric functions fast, but not that fast ? When people try to optimize numerical algorithms, there is a point when the profiler says a significant part of time is spent computing sin, cos, tan, sqrt, etc. Re-implementing custom versions is often beneficial in term of CPU time (with tremendous gain sometimes !)
The only advantage is that you get a statically-linked CRT — versus linking against an old msvcrt.dll per Mingw-w64 — though historically Microsoft's UCRT has been kind of buggy, and those bugs then get baked into your binaries. MSVC code generation quality is almost on par with GCC and Clang. It doesn't quite support C99 and probably never ...
Jun 10, 2014 · The usual lib files (msvcrt.lib, libcmt.lib, etc.) are built such that the newly refactored CRT is a drop-in replacement for the old CRT at build-time, so long as /nodefaultlib is not used. While we have retained the version number in the DLL for this CTP, we plan to remove it from the AppCRT and DesktopCRT before the final release of Visual Studio “14,” since we will be updating those ...
Mar 12, 2015 · On a i5-2400 running Win7 x64 I get the following results: current: 2219.987 cygwin: 1184.710 msvcrt: 849.565 These imply that cygwin and msvcrt are 1.8 or 2.5 times faster than the provided implementation. For input values close to zero (0.1337) the difference is even bigger: current: 3197.078 cygwin: 640.613 msvcrt: 849.683
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Dec 28, 2020 · Microsoft UCRT versus older MSVCRT Notes: - The VCRUNTIME/UCRT DLL is faster than the old MSVCRT. The good news is: The Win10 MSVCRT basically uses the new vcruntime.dll under the hood. - The older VS 2008 compiler has problems with the builtin functions. With -O2 the builtin functions are enabled, and are used instead of the MSVCRT functions.
