From: arne@vajhoej.dk   
      
   On 2/24/2025 4:22 PM, Michael S wrote:   
   > On Mon, 24 Feb 2025 15:08:57 -0500   
   > Arne Vajhøj  wrote:   
   >> On 2/24/2025 12:42 PM, Michael S wrote:   
      
   >> C++ VMS x86-64 is clang which in the (older) clang version used   
   >> should mean C++14 while C++ VMS Itanium is very very old (like   
   >> C++ 98 old).   
   >>   
   >>> According to the benchmarks that you posted here several months (a   
   >>> year?) ago, VMS x86-64 compilers are quite awful comparatively to   
   >>> x86-64 compilers available on Windows/Linux/BSD.   
   >>> Do you want to say that VMS Itanium compilers are worse?   
   >>   
   >> I believe the conclusion was that the VMS x86-64 compilers except C++   
   >> was slower than C/C++ on other OS and C++ on VMS.   
   >   
   > Somehow I got an impression that C++ compilers were also significantly   
   > slower than C++ compilers on other platforms.   
   > Do I misremember?   
      
   I don't even remember that I posted non-VMS numbers here. Age! :-)   
      
   But I just checked VMS C++ latest (CXX/OPT=LEVEL:5 and clang -O3) vs a   
   random Windows GCC 14.1 (g++ -O3):   
      
   VMS is a little faster for integer   
   they are about the same for floating point   
   Windows is a lot faster for string   
      
   And given that this is a micro-benchmark with in reality just an inner   
   loop evaluating a single expression, which means huge uncertainty, then   
   I don't see this as proof of a significant difference.   
      
   Arne   
      
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