For a C function with the prototype: long decode(long x, long y, long z); gcc generates the following assembly code: decode: subq %rdx, %rsi imulq %rsi, %rdi movq %rsi, %rax salq $63, %rax sarq $63, %rax xorq %rdi, %rax ret Parameters x, y, and z are passed in registers %rdi, %rsi, and %rdx respectively. The code stores the return value in %rax. Write C code for the function decode that will have an effect equivalent to the assembly code above.