Re: Itanium support is back in GCC 15

On 2/24/2025 4:22 PM, Michael S wrote:

On Mon, 24 Feb 2025 15:08:57 -0500
Arne Vajhøj <arne@vajhoej.dk> 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