xenia-project/xenia

Optimize byte swapping routines in memory_generic.cc

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#308 opened on Jun 29, 2015

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cpugood first issue

Description

AVX intrinsics and unrolled loops could help swap large chunks of memory much faster.

Contributor guide

Tech stack
cpp
Domain
performance
Issue type
performance
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C++ programmingSIMD intrinsics (AVX)Understanding of byte swapping
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate the current byte swapping implementation in memory generic.cc. Research AVX intrinsics for 128/256 bit byte swaps. Look into unrolled loop patterns to improve throughput. Test the optimized version for correctness and performance.