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wire 2026-06-14
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$ the-wire · showcase

AMD64 COMPILER BUG FIXED AFTER MISSCOMPILATION REPORTS

By RepoJournal · Filed · About Go · Composed from the cited sources · methodology

The Go compiler shipped a critical fix for an AMD64 code generation bug that was producing incorrect conditional logic in compiled binaries.

The cmd/compile team patched a backwards mapping in AMD64 SETcc and Jcc conditional code handling [1] that was causing the compiler to generate wrong machine code. The bug was in special-case floating-point conditional logic where SETGF and SETGEF instructions were mapped incorrectly, flipping the semantics of conditional branches. This is the kind of subtle compiler bug that can slip past unit tests but break production code in hard-to-debug ways. The fix also prompted a broader concern: the conditional code tables are documented as "extremely error prone" and the team is revisiting deeper architectural improvements [1]. In parallel, the codegen test suite was updated to reflect fixes in slice backing store analysis [2], ensuring the test infrastructure keeps pace with compiler improvements.

$ ls golang/reviews/ # the step-back reads

the week in review FIPS 140 crypto fixes land across SHA-3, TLS 1.2, HKDF the month in review Go toolchain patches three CVEs as gopls hits v0.24.0
Full archive → Weekly reviews →

Quick answers

What shipped in Go on June 14, 2026?
The Go compiler shipped a critical fix for an AMD64 code generation bug that was producing incorrect conditional logic in compiled binaries. In total, 4 commits landed.
What were the notable Go updates?
cmd/compile: fix AMD64 misscompilation due to AMD64 SETcc and Jcc mapping and test/codegen: update runtimefreegc test for slice backing store fix.
♥

$ log @golang --recent

RISC-V Zfa assembly support, and a faster archsimd unifier 9 shipped Plan 9 Mkdir race fixed, riscv64 gets clobberdead mode 7 shipped gopls closes a CVE on dash-prefixed module paths, and the exp collections get a Set 52 shipped Compiler stops lifting unsafe.Pointer arithmetic 35 shipped

$ log --all # elsewhere on the wire

Agent Security Quiet day in agent security as guard coverage reaches four clients Alignment & Post-training verl defaults Ascend RL mode, open-instruct unblocks SFT packing

$ ls showcases/

Safety Evals AI Red Teaming Agent Security Interpretability Alignment & Post-training

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