Not bit-exact: the radial offset d.rad is ddx*ux + ddy*uy inlined at two sites, which the compiler may contract to an FMA differently, so the clip's bin (lround(r0 + rad)) moved on a few pixels of one sweep's CPU run. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01D1G8gJVAy6gp1K5Dz3NE5C