Using gcc inline assembly to Shift Right fails with "Error: operand type mismatch for `shr'"

Issue

• Using gcc inline assembly to Shift Right fails with

asmshift.c: Assembler messages:
asmshift.c:8: Error: operand type mismatch for `shr'

• Example code uses SHR Shift Right instruction, eg:

     1  #include <stdio.h>
     2  #include <stdint.h>
     3
     4  static inline int atna_shrc64pu(uint64_t *d, uint64_t b, int crin, int *cr)
     5  {
     6    // assumed *d = a;
     7    asm("neg %1\n\t"
     8        "shrq %3,%0\n\t"
     9        :"+r"(d), "+&r"(crin), "=@ccc"(*cr)
    10        :"r"(b));
    11    return 1;
    12  }