RISC-V Summit

QEMU is an emulator that developers can developer and debug their software on it before getting the real RISC-V hardware. We observed that vectorized executables run much slower than non-vectorized ones on QEMU. From benchmarks (e.g. SPEC CPU2k6 h264), we can see that most of the execution time is occupied by RVV load/store instructions. The same observation has been reported in the QEMU community. For example, the glibc memcpy benchmark runs 2x to 60x slower than its scalar equivalent on QEMU. We aim to improve the performance of RVV instructions in QEMU, thereby reducing the execution time required for tasks such as Android bootup. In this talk, we will provide an overview of how we enhanced the performance of QEMU RVV load/store instructions and discuss future work.