During a veteran’s recount of Windows’ days, he described an x86‑32 processor emulator that ran on non‑x86 hardware. The emulator used binary translation, generating native code instead of interpreting each instruction, which gave a speed boost. In this setup, a program that allocated a 64 KB stack buffer exposed a compiler flaw that multiplied code size dramatically. Built emulator to let Windows applications run on architectures.

The compiler tried to avoid a loop for zero‑initializing the buffer and instead unrolled it into 65,536 individual store instructions. Each write occupied four bytes, inflating the function, for performance, to 256 kilobytes of code to set up 64 KB of data. Such bloat not only wasted memory but also slowed translation, prompting the emulator team to intervene with a corrective patch.

The team added a special pass to the translator that detects the monstrous routine and replaces it with a compact loop, restoring the expected performance. This anecdote illustrates how JIT‑style emulators must guard against pathological code generation, a lesson still relevant as modern binary translators handle increasingly complex workloads and need robust sanity checks.