Chris Green
@aachrisg.bsky.social
Back at Valve. gfx,simulation,parallelism,math,AI,HW,VR,game engines. MTG Online,Ultima Underworld,AmigaOS,Flight Sim,Scuba,Paleontology. ~40years experience.
I made both a Mastodon and Bluesky account so I could check them both out.
I made both a Mastodon and Bluesky account so I could check them both out.
Reposted by Chris Green
Wild. Top is the NBC upload, bottom is the one aired as the live feed
January 21, 2025 at 5:45 AM
Wild. Top is the NBC upload, bottom is the one aired as the live feed
D-oh:
std:fma will generate the fused multiply add instruction in MSVC and GCC, regardless of the setting of fp:precise as you would hope..
But MSVC doesn't know how to auto vectorize it, which kind of defeats the purpose :-( :-(. GCC does though:
godbolt.org/z/4f91hWKEE
std:fma will generate the fused multiply add instruction in MSVC and GCC, regardless of the setting of fp:precise as you would hope..
But MSVC doesn't know how to auto vectorize it, which kind of defeats the purpose :-( :-(. GCC does though:
godbolt.org/z/4f91hWKEE
Compiler Explorer - C++
auto TestFMAVectorization( float flScale, float *a, float const *b, int n )
{
for( int i = 0; i < n; i++ )
{
a[i] = std::fma( flScale, b[i], a[i] );
}
}
godbolt.org
November 23, 2024 at 9:41 PM
D-oh:
std:fma will generate the fused multiply add instruction in MSVC and GCC, regardless of the setting of fp:precise as you would hope..
But MSVC doesn't know how to auto vectorize it, which kind of defeats the purpose :-( :-(. GCC does though:
godbolt.org/z/4f91hWKEE
std:fma will generate the fused multiply add instruction in MSVC and GCC, regardless of the setting of fp:precise as you would hope..
But MSVC doesn't know how to auto vectorize it, which kind of defeats the purpose :-( :-(. GCC does though:
godbolt.org/z/4f91hWKEE
A rare programming blog post. My favored approach for unique symbols/magic enums in c++.
chrisgreendevelopmentblog.wordpress.com/2024/10/03/a...
chrisgreendevelopmentblog.wordpress.com/2024/10/03/a...
Approaches for efficient unique symbols in C++
A very useful system to have, especially in large codebases (including in game development) is an automated unique symbol generator. A unique symbol is a mapping from a textual identifier that has …
chrisgreendevelopmentblog.wordpress.com
October 3, 2024 at 12:44 AM
A rare programming blog post. My favored approach for unique symbols/magic enums in c++.
chrisgreendevelopmentblog.wordpress.com/2024/10/03/a...
chrisgreendevelopmentblog.wordpress.com/2024/10/03/a...
Is this thing on?
I've made both mastodon and bluesky accounts to replace twitter so I can check them out and decide which to keep.
c++ should have an abbreivated lambda syntax for simple functions. Like:
[]( int arg ) = arg * 2
I've made both mastodon and bluesky accounts to replace twitter so I can check them out and decide which to keep.
c++ should have an abbreivated lambda syntax for simple functions. Like:
[]( int arg ) = arg * 2
August 26, 2024 at 8:50 PM
Is this thing on?
I've made both mastodon and bluesky accounts to replace twitter so I can check them out and decide which to keep.
c++ should have an abbreivated lambda syntax for simple functions. Like:
[]( int arg ) = arg * 2
I've made both mastodon and bluesky accounts to replace twitter so I can check them out and decide which to keep.
c++ should have an abbreivated lambda syntax for simple functions. Like:
[]( int arg ) = arg * 2