Developers behind the open-source PlayStation 3 emulator RPCS3 claim that they’ve achieved a breakthrough in emulating the PS3's Cell Broadband Engine processor, with lead developer Elad discovering previously unrecognized SPU usage patterns and writing new code paths to generate more efficient native PC output from them. The improvement benefits every game in the emulator's library, with Twisted Metal, one of the most SPU-intensive titles, showing a 5% to 7% average FPS improvement between builds v0.0.40-19096 and v0.0.40-19151.
The PS3's Cell processor paired a PowerPC-based PPU with up to seven Synergistic Processing Units, each a 128-bit SIMD co-processor with its own 256KB of local store memory. RPCS3 emulates SPU workloads by recompiling the original Cell instructions into native x86 code using LLVM and ASMJIT backends. The quality of that translation determines how much host CPU time each emulated SPU cycle consumes.
