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By Adrián Pérez
The MIPS processor cores are widely used in embedded platforms, including TVs and set-top-boxes. In most of those platforms dedicated graphics hardware exists but it may be specialized for its use in audio and video signal processing: rendering of web content has to be done in software. We implemented optimizations for the software-based QPainter renderer to improve the performance of Qt including QtWebKit in MIPS processors. The target platform was the modern 74kf cores, which include new SIMD instructions suitable for graphics operations (alpha blending, color space conversion and JPEG image decoding), and also for non-graphics operations: string functions were also improved. Our figures estimate that web pages are rendered up to 30% faster using hand-coded assembler fast-paths for those operations.