Compile C, C , Rust, Haskell, Ispc, Java and other languages, and see assembly output. Also @compiler-explorer.com on bluesky
Joined October 2018
- Tweets 659
- Following 92
- Followers 7,315
- Likes 1,427
22 Photos and videos
Pinned Tweet
23 Jul 2025
CE relies on your support! How you can help:
* Submit PRs & report issues: github.com/compiler-explorer…
* Become a Patron: patreon.com/mattgodbolt
* Sponsor us: github.com/sponsors/compiler…
* Buy CE swag: shop.compiler-explorer.com/
* Join our Discord: discord.gg/B5WacA7
Thanks all!
1
4
18
2,801
@compiler_explorer@hachyderm.io retweeted
Feb 27
There is one problem though.
You can’t see it.
Well, not directly at least. You’ll never find uOPs in the binary.
But! You can see the “shape” of it with performance tools…and there are subtle tells in the binary as well (hint, some nops).
3
10
329
17,549
@CompileExplore but for natural language :)
Feb 12
Happy to announce that Etymology Explorer got a UX revamp and is also now completely free to use. No API Keys. No paywall. No signup. Just words and their roots.
1
4
636
Compiler Explorer: The Features You Never Knew Existed - by @mattgodbolt- CppCon 2025
youtu.be/3W0vE_VKokY
#Coding #Cplusplus #Cpp #Programming #cppcon
5
22
1,906
We have just released a new CppCon 2025 Video!
Compiler Explorer: The Features You Never Knew Existed - by @mattgodbolt- CppCon 2025
youtu.be/3W0vE_VKokY
#Coding #Cplusplus #Cpp #Programming #cppcon
1
8
30
2,582
@compiler_explorer@hachyderm.io retweeted
This December, I'll be posting a blog & video each day until Christmas in the Advent of Compiler Optimisations! #AoCO2025
Each day we'll explore a fun optimisation in C or C ; some low-level, x86 or ARM, some high-level.
YT: youtube.com/mattgodbolt
Blog: xania.org
3
47
300
80,973
@compiler_explorer@hachyderm.io retweeted
4 Nov 2025
New Podcast Episode: @mattgodbolt is back after 5 years!
And he's sharing stories about breaking through abstractions.
Sometimes your “disk write” is a network hop in a trench coat, and your “fast path” hides a page fault.
Godbolt's rule will help.
1
4
25
2,788
@compiler_explorer@hachyderm.io retweeted
1 Oct 2025
New C Weekly pirate themed constexparrr! (constexpr) swag landing just in time for Halloween!
jason-turner-shop.fourthwall…
jason-turner-shop.fourthwall…
jason-turner-shop.fourthwall…
#constexprallthethings
2
23
2,557
@compiler_explorer@hachyderm.io retweeted
2 Sep 2025
@CompileExplore mug arrived in perfect conditions here in Italy!
5
16
2,371
@compiler_explorer@hachyderm.io retweeted
Hi @pjkrill - just a heads up, @CompileExplore is a grass roots user-created site, independent of anyone. That's why the site is "godbolt.org" - it's my domain, not MS! (ref: infoworld.com/article/404634… "... Microsoft introduced the Compiler Explorer,
5
2
28
3,654
@compiler_explorer@hachyderm.io retweeted
Hey folks! @CompileExplore is free & open for everyone, but if you're planning to use our API for bulk executions though, please ping us! CE is a shared resource and heavy use can slow things down for the whole community. DM me to chat - happy to help work something out! :)
8
82
5,839
18 Aug 2025
If you're like @mattgodbolt and can't remember if it's RCX or R8 for the fourth parameter... Get the Compiler Explorer ABI Mug: actual calling conventions for x86-64 System V, Windows, and ARM64. Support CE : grab yours here -> shop.compiler-explorer.com/c…
1
4
15
2,402
30 Jun 2025
Huge news! AWS has approved Compiler Explorer for their Open Source Credits program, covering our infrastructure costs for the next year!
Thank you @AWSOpen for supporting open source! This means faster compiles, better queuing & more improvements coming. Exciting times ahead!
2
5
149
7,652
@compiler_explorer@hachyderm.io retweeted
24 Jun 2025
Check out this actual real usable test case ("test" but it does actually work and could be put in production code AFAICT) of using C 26's reflection with cross-language bindings!
Working example you can play with: godbolt.org/z/6Y17EG984
ALT int main() { cons_expr evaluator; // auto bind all members of the namespace with the scripting engine bind<^^lefticus>(evaluator); // test calling of "q" and "u" functions evaluator.evaluate(R"( (q) (u 2 3) (print (myfloor ( 3.2 13.9))) )"); }
4
2
61
4,742
@compiler_explorer@hachyderm.io retweeted
1 Jun 2025
We got @CompileExplore running in @ladybirdbrowser!
More work is required to actually edit the code live on the site, but we can now load/compile programs and view their disassembly. So cool! 🤓
4
21
661
23,986
@compiler_explorer@hachyderm.io retweeted
On @CompileExplore URLs and Google product lifetimes: xania.org/202505/compiler-ex…
6
18
1,779
23 Apr 2025
And of course I meant to to @CompileExplore here....
Thrilled to share that @CompilerExplore has received a $10K grant from NVIDIA's FOSS Fund! This support will help keep our GPU instances running and allow developers worldwide to experiment with CUDA code. Thank you @NVIDIAAIDev for supporting open source tools! #NVIDIAGrant
5
1,076
@compiler_explorer@hachyderm.io retweeted
19 Apr 2025
When @mattgodbolt, who helped the compiler community and low-level programming enthusiasts to a great extent with @CompileExplore (godbolt), talks about "What Every Programmer Should Know about How CPUs Work", it's a must-watch talk.
gotopia.tech/sessions/3281/w…
6
40
2,326
Always delighted when folks find out some of our cooler features! Shame our UX makes it harder to find but still yay! -mg
1 Mar 2025
til godbolt (compiler explorer) will give you generated SASS instructions from NVIDIA PTX and CUDA code if you give it the right flag
(-arch=sm_90 for hopper)
1
1
40
2,692
31 Dec 2024
Compiler Explorer in 2024!
0.017 cents per compilation for 190M compilations. Tons of new features, Matt takes stock:
patreon.com/posts/compiler-i…
5
10
1,983