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6.44.2. Extended Asm - Assembler Instructions with C Expression Operands

6.44.2 Extended Asm - Assembler Instructions with C Expression Operands

With extended asm you can read and write C variables from assembler and perform jumps from assembler code to C labels. Extended asm syntax uses colons (‘:’) to delimit the operand parameters after the assembler template: 

asm [volatile] ( AssemblerTemplate
                 : OutputOperands
                 [ : InputOperands
                 [ : Clobbers ] ])

asm [volatile] goto ( AssemblerTemplate
                      :
                      : InputOperands