[GSoC 2026] DCompute Vulkan Backend

[Quang Ha]

### My GSoC Progress: Back from Exams & A Surprise Bug!

Hi everyone, this is my new update. I took a short break from the 
project because I had to study for my university final exams. 
Now, I am back to work!

#### 🛠️ What I Did This Week
* **Fixed the Linker Error:** First, I updated my LDC and LLVM to 
the newest versions. But then, I got a very bad linker error and 
could not build the compiler. Finally, I found a trick! I added a 
new entry in CMake: `CMAKE_MSVC_RUNTIME_LIBRARY` with the value 
`MultiThreaded`. This fixed the build.
* **Continued ABI Testing (from Week 3):** I went back to my 
unfinished work from Week 3. I used the `vulkan_minimal_compute` 
project to do ABI testing and check if my `.spv` file works with 
the Vulkan API.
* **Found an LLVM Bug!:** This is the most interesting part of 
the week. While I was doing the ABI testing, I found a bug. But 
it was not my bug, it was a bug inside LLVM! So now, I am also 
trying to fix this LLVM bug.

#### 🛑 Challenges
* **Getting back on track:** Taking a break for exams made me 
forget some small details. It took me a little time to remember 
how the ABI testing works from Week 3.
* **Fixing LLVM:** Finding a bug in my own code is normal, but 
finding a bug inside LLVM is a big surprise. The LLVM codebase is 
very huge, so fixing it is a big challenge for me.

#### 🎯 Plans for Next Week
* I will focus on fixing the LLVM bug I found.
* I will finish the ABI testing with the `vulkan_minimal_compute` 
project.
* I will clean up my code and wait for my mentor to review my 
pull request.

#### 🔗 Resources & Code
* Commits/PRs: https://github.com/ldc-developers/ldc/pull/5132
* My Personal Blog: https://gnavdev28.github.io