[Info-vax] Itanium support is back in GCC 15

[Arne Vajhøj]

On 2/24/2025 4:22 PM, Michael S wrote:
> On Mon, 24 Feb 2025 15:08:57 -0500
> Arne Vajhøj <arne at 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