Systems Software Engineer
Compilers, GPU drivers, Linux kernel, firmware, and virtualization.
pyudistira519@gmail.com · GitHub · LinkedIn
| Project | Area | Status | Contribution |
|---|---|---|---|
| Khronos Vulkan Validation Layers | Validation Layers | Merged | Fixed static descriptor set array index out-of-bounds crash (VVL-12294 / PR #12743) and added C++ regression tests. |
| LLVM | AMDGPU Backend | Approved (Pending Merge) | Prevented invalid SILoadStoreOptimizer memory instruction merging on TFE/LWE image loads (collectMergeableInsts()). |
| Linux Kernel | Kernel Subsystems | Accepted | Upstream patch accepted into maintainer tree. |
| OpenSBI | RISC-V Firmware | Pending Review | Clamped string buffer boundaries in sbi_ecall_get_extensions_str (0001-lib-sbi-clamp). |
| QEMU | x86_64 Emulation | Tested-by | Functional testing and bug isolation for x86 long mode segment prefix decoding (#3391). |
Bitcoin Core libsecp256k1 |
Crypto Primitives | Contributor | Authored dynamic differential testing harness (ecc-audit-engine) for EC math primitives. |
- Compilers: LLVM backend code generation,
SelectionDAG, machine instruction pass optimizations (SILoadStoreOptimizer), and ABI enforcement. - Graphics & GPU Drivers: Vulkan API validation rules, descriptor set memory boundaries, and AMDGPU vector memory instruction constraints.
- Kernel & Firmware: Linux kernel maintainer tree patches, dynamic tracing (
ftrace), and RISC-V OpenSBIecallhandlers. - Virtualization: QEMU instruction decoding and x86 long mode segment override prefix handling.
- Understand root causes before proposing fixes.
- Target-specific regression tests (
.llassembly, GoogleTest, C reproducers) are part of the fix. - Small, reviewable patches are preferred over large architectural rewrites.
Bitcoin Core (libsecp256k1)
↓
Linux Kernel & QEMU
↓
LLVM (AMDGPU)
↓
Khronos Vulkan Validation Layers
↓
OpenSBI (RISC-V)
Yudis-bit/ecc-audit-engine— Dynamic differential testing, failure minimization, and trace runner forsecp256k1C primitives.Yudis-bit/arkheionx— Local-first review infrastructure and bytecode execution analyzer.Yudis-bit/Vulkan-ValidationLayers— Fork containing descriptor set validation fixes and validation test suite additions.Yudis-bit/llvm-project— Fork containing LLVM AMDGPUSILoadStoreOptimizerrefactoring and RISC-V ABI fixes.Yudis-bit/opensbi— Fork containing RISC-V Supervisor Binary Interface extension buffer clamping.