There are two typos in andL_rReg_imm instructions in x86_64.ad. The first one generates confusing output with PrintOptoAssembly: 009 movzbq RAX, #255 # long & 0xFF and the second generates a non-matching instruction (see rRegI): instruct andL_rReg_imm65535(rRegI dst, immL_65535 src)
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