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With IEEE_MODE=1 the hardware quiets a signaling NaN that v_cubesc, v_cubetc or v_cubema_f32 returns, keeping the sign the instruction gives it; with IEEE=0 the bits pass through. Same rule as #1867, measured on gfx1036 in both modes. Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>