ref: a1e3abc209473dd524ec163eca35edfa7ac65b3a dir: /as/target/x86/rules.dat/
reg8 AREG_R8CLASS reg16 AREG_R16CLASS imm8 AIMM8 imm16 AIMM16 imm32 AIMM32 imm64 AIMM64 \(n\) ADIRECT sym ASYM string ASTR