c9f194dda1
PPCBUG-160 partial: stswi's single invalidate_for_write(ea) only covered the first cache line; with nb up to 32, the write span can cross a 128-byte line boundary. Replace with two-call guard: first_line = ea & !RESERVATION_MASK last_line = ea.wrapping_add(nb - 1) & !RESERVATION_MASK invalidate first; if last != first, invalidate last. PPCBUG-160 partial: stswx had the same single-call gap; nb from XER[0:6] can be up to 127 bytes. Same two-call guard applied; wrapped in `if nb > 0` to guard against nb==0 underflow (XER TBC field is 0 when no bytes to store). dcbz: zeroes 32 bytes at a 32-byte-aligned EA — touches exactly one 128-byte cache line; add canonical single-call invalidate guard (was entirely missing). dcbz128: zeroes 128 bytes at a 128-byte-aligned EA — one full reservation line; add canonical single-call invalidate guard (was entirely missing). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>