This function:

int f(int x)
{
  return x ^ 0x1234;
}

currently compiles (with -mtune=xscale) to:

        mov     r3, #4608
        add     r3, r3, #52
        eor     r0, r0, r3
        @ lr needed for prologue
        mov     pc, lr

or (with -mtune=arm9) to:

        ldr     r3, .L3
        @ lr needed for prologue
        eor     r0, r0, r3
        mov     pc, lr
.L4:
        .align  2
.L3:
        .word   4660

But, in both cases, it could be better done as:

        eor     r0, r0, #4608
        eor     r0, r0, #52
        mov     pc, lr