builtin_31_readcyclecounter.arm32.skip (341B)
1 ARMv7-M (Cortex-M) has no architectural always-on cycle counter reachable as a single instruction. The DWT CYCCNT counter is optional and requires privileged setup (DEMCR.TRCENA + DWT_CTRL.CYCCNTENA) that a bare __builtin_readcyclecounter() cannot express, so arm32 reports the intrinsic unsupported — the same rationale as the wasm skip.