5.6.2 - 2026-11-03

Fixes

• Simulation: fix SIGILL on arm64 when programs read previously unsupported CPU ID registers or TPIDRRO_EL0 (#59).
• Go: benchmarks that draw from the global math/rand now start from the same seed on every run, so their results no longer vary between runs (#596).

Release Notes

🚀 Features

• Seed Go's global math/rand deterministically (#596) by @not-matthias in #596

⚙️ Internals

• Bump pinned valgrind-codspeed to 3.26.0-0codspeed12 (#604) by @adriencaccia in #604
  • feat: add --deterministic-rng to make client randomness reproducible by @not-matthias in CodSpeedHQ/valgrind-codspeed#54
  • feat(vex): serve arm64 RNDR and RNDRRS with --deterministic-rng by @not-matthias in CodSpeedHQ/valgrind-codspeed#56
  • fix(vex): decode arm64 MRS of all EL0-visible ID registers by @not-matthias in CodSpeedHQ/valgrind-codspeed#59

Install codspeed-runner 5.6.2

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/CodSpeedHQ/codspeed/releases/download/v5.6.2/codspeed-runner-installer.sh | sh

Download codspeed-runner 5.6.2

File	Platform	Checksum
codspeed-runner-aarch64-apple-darwin.tar.gz	Apple Silicon macOS	checksum
codspeed-runner-aarch64-unknown-linux-musl.tar.gz	ARM64 MUSL Linux	checksum
codspeed-runner-x86_64-unknown-linux-musl.tar.gz	x64 MUSL Linux	checksum