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#include <cstring>
#include <iostream>
 
using namespace std;
 
char *trimRight(char *s)
{
  register char *p asm("rax") = s;
  register char *spc asm("rbx") = 0;
 
  __asm__ (
    "LOOP:                         \n"
    "  test BYTE PTR [rax] 255     \n"
    "  jz DONE                     \n"
    "                              \n"
    "  cmp BYTE PTR [rax] 32       \n"
    "  jz SPC                      \n"
    "  inc rax                     \n"
    "  jmp LOOP                    \n"
    "                              \n"
    "  SPC:                        \n"
    "    mov rbx rax               \n"
    "    SPC_LOOP:                 \n"
    "      inc rax                 \n"
    "      cmp BYTE PTR [rax] 32   \n"
    "      jz SPC_LOOP             \n"
    "      jmp LOOP                \n"
    "                              \n"
    "DONE:                         \n"
  );
 
  if (spc && p!=s && p[-1]==' ') *spc = 0;
 
  return s;
}
 
int main()
{
  char s[256];
 
  cout << '"' << trimRight(strcpy(s, ""))                  << '"' << endl;
  cout << '"' << trimRight(strcpy(s, "abc qwe zzz   "))    << '"' << endl;
  cout << '"' << trimRight(strcpy(s, "abc  qwe  zzz   "))  << '"' << endl;
  cout << '"' << trimRight(strcpy(s, "abc  qwe  zzz   u")) << '"' << endl;
 
  return 0;
}

prog.cpp: Assembler messages:
prog.cpp:31: Error: junk `PTR [rax]255' after expression
prog.cpp:31: Error: number of operands mismatch for `test'
prog.cpp:34: Error: junk `PTR [rax]32' after expression
prog.cpp:34: Error: number of operands mismatch for `cmp'
prog.cpp:36: Error: no instruction mnemonic suffix given and no register operands; can't size instruction
prog.cpp:40: Error: junk `rax' after expression
prog.cpp:40: Error: number of operands mismatch for `mov'
prog.cpp:42: Error: no instruction mnemonic suffix given and no register operands; can't size instruction
prog.cpp:43: Error: junk `PTR [rax]32' after expression
prog.cpp:43: Error: number of operands mismatch for `cmp'

Standard output is empty