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Rmuk655/README.md

Hi, I'm Krishnan 👋

Computer Science undergraduate at IIT Hyderabad (B.Tech CSE, 2024-2028). I like systems, compilers, computer architecture and ML inference: building things close to the machine and measuring whether they actually work.

Currently

  • Contributing to LLVM: an X86 backend crash on vector atomicrmw (issue #226002, PR #230788, open) and a LoopBoundSplit post-loop guard fix (PR #233253, open)
  • Compiler construction: DSL front ends and lowering to LLVM/MLIR
  • Research on speculative decoding and draft-model distillation (write-up on Medium)

Selected work

Project What it is Stack
LLVM contributions #230788: root-caused and fixed an X86 ISel crash, so vector atomicrmw is now expanded to a cmpxchg loop, with regression tests with and without +cx16. #233253: LoopBoundSplit now builds its post-loop guard from the original exit condition. Both open C++, LLVM
RISC-V Toolchain & Web Simulator Assembler, disassembler, debugger, cache simulator and pipeline hazard detector; compiles to WebAssembly for a browser front end C++17, WASM
xv6 Kernel Extensions Syscall-aware MLFQ scheduler, clock page replacement with swap, FCFS/SSTF disk scheduling, RAID 0/1/5-backed swap C, RISC-V
DistillSpec research Multi-GPU platform for speculative-decoding research: 500+ tracked experiments, 71 checkpoints, multi-rollout distillation that beat the JSD baseline, and delayed tree branching extended to trained drafts (write-up) Python, PyTorch, vLLM
OCaml compiler extension Exception handling across lexer, parser, AST, typechecker and runtime; submitted upstream to plzoo as PR #41 (open) OCaml
FPU-assisted integer execution Splitting integer multiply chains across integer and FP units by a throughput model; measured on gem5 (X86 O3) across optimisation levels, IU/FPU latencies and IU counts: about 2x on convolution at -O3 (via compiler vectorisation), no gain on factorial or matmul C
Data Structures Balanced trees (AVL, red-black, 2-4, B-tree), hashing, graphs and 2-SAT, fuzz-tested against std::set C++
Business entity resolution Record-linkage pipeline for the Amazon ML Challenge: blocking, pruning and a two-pass LightGBM matcher Python
Compiler Construction Flex/Bison Tcl-to-C++ transpiler, Kaleidoscope front end emitting LLVM IR, Clang AST-matcher tools and LLVM IR studies Flex, Bison, LLVM, Clang
Computer Networks Dual-stack VyOS static-routing lab and a C++ group messaging system with TCP control, UDP multicast and TLS C++, VyOS
Tensora DSL for ML computation graphs with static checking, typed graph IR, optimisation passes and MLIR/LLVM lowering C++, MLIR
Tune DSL Music DSL compiled to audio with three cross-checked backends (Python, C++, MLIR) Python, MLIR

Interests

Operating systems · Compilers · Computer architecture · ML systems · Performance engineering

Profiles

LinkedIn · LeetCode · Codeforces

Pinned Loading

  1. llvm-project llvm-project Public

    Forked from llvm/llvm-project

    The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.

    LLVM 1

  2. Distill-Spec-Research Distill-Spec-Research Public

    Distilling draft models for speculative decoding (Qwen3 0.6B/8B and 1.7B/32B): a controlled study of loss families against a strong JSD baseline.

    Python 1

  3. RISC-V-Toolchain-Web-Simulator RISC-V-Toolchain-Web-Simulator Public

    Browser-based RISC-V simulator and debugger with cache simulation, hazard visualization, and WebAssembly integration.

    C++ 2

  4. xv6-Kernel-Extensions xv6-Kernel-Extensions Public

    Implemented xv6 kernel extensions including MLFQ scheduling, virtual memory optimizations, RAID simulation, and disk scheduling.

    C 2

  5. miniml-compiler-extension miniml-compiler-extension Public

    Forked from andrejbauer/plzoo

    Extended an OCaml compiler with exception handling support across lexer, parser, AST, typechecker, and runtime stages.

    OCaml 3

  6. Compiler-Construction Compiler-Construction Public

    Compiler construction projects: Flex/Bison lexers and parsers, a Tcl-to-C++ transpiler, LLVM IR, a typed Kaleidoscope front end, and Clang LibTooling AST tools.

    LLVM 1