Method: RubyVM::RJIT::Assembler#sub

Defined in:
lib/ruby_vm/rjit/assembler.rb

#sub(dst, src) ⇒ Object 



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# File 'lib/ruby_vm/rjit/assembler.rb', line 802

def sub(dst, src)
  case [dst, src]
  # SUB r/m64, imm8 (Mod 11: reg)
  in [R64 => dst_reg, IMM8 => src_imm]
    # REX.W + 83 /5 ib
    # MI: Operand 1: ModRM:r/m (r, w), Operand 2: imm8/16/32
    insn(
      prefix: REX_W,
      opcode: 0x83,
      mod_rm: ModRM[mod: Mod11, reg: 5, rm: dst_reg],
      imm: imm8(src_imm),
    )
  # SUB r/m64, r64 (Mod 11: reg)
  in [R64 => dst_reg, R64 => src_reg]
    # REX.W + 29 /r
    # MR: Operand 1: ModRM:r/m (r, w), Operand 2: ModRM:reg (r)
    insn(
      prefix: REX_W,
      opcode: 0x29,
      mod_rm: ModRM[mod: Mod11, reg: src_reg, rm: dst_reg],
    )
  end
end