How to specify an individual register as constraint in ARM GCC inline assembly?

Question

in x86 inline assembly i can write something like this:

asm (\"cpuid\"
            : \"=a\" (_eax),
              \"=b\" (_ebx),
              \"=c\" (_ecx),         


        

Answer 1

I don't think gcc for ARM allows you to use constraints to specify exactly which register to use. However, you can use explicit register variables to specify a register to store a variable in:

register int my_variable asm("r0");