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(cherry picked from ran-j/PS2Recomp#243 1f8a5876e672) Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015J5urgXz3gieuQtrtDC1ZS
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Handle SQ stores to GS privileged registers by forwarding the low 64-bit lane to the existing register handler and discarding the upper lane. Non-FIFO 128-bit hardware writes use this behavior in PCSX2 as well. Without it, games that update DISPFB through SQ silently lose framebuffer flips.\n\nAdds a PS2Memory regression covering the target register and adjacent-slot preservation.\n\nTested: MINITEST_FILTER='quadword stores update one GS privileged register slot' ps2x_tests.exe