RESULT-CHANGING for the GPU adaptive spot finder, only where a clip bound sat within its last bit of
an integer.
clip_keep formed mean -/+ clip_k * sigma as one fused multiply-add each; AdaptiveSpotFinderCPU::ClipRings
computes the product and then the sum (contraction is off project-wide). The two bounds differ in the
last bit, and where that crosses an integer pixel value every pixel of that value in the ring moves in
or out of the clip, so the ring mean/sigma - and the ring's threshold - differ. clip_keep now rounds
product then sum (__fmul_rn, __fsub_rn / __fadd_rn), still in one place for every kernel.
Measured: a diagnostic build evaluating both forms in every clip_keep found 2 differing tests each on
lyso_x06da_ref (of 4.7e7), yag_x10sa_20keV (of 2.2e8) and 4nwv (of 7.0e7), none on cytc_x10sa,
myob_x10sa and thau_bl1a_3p8keV. The battery GPU runs before and after give bit-identical p.hkl on
all six sets.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PXc1zD1yxHqaR1DGdCTHL4
leonarski_fandClaude Opus 5.5
7539f216dd