In 64-bit mode REX.W takes precedence over the 0x66 operand-size prefix, so the immediate of 81, C7, 69, 68, A9, the 05..3D accumulator forms and the F7 TEST form stays imm32. The decoder only applied this to B8+r and returned a length two bytes short for the others. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> |
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