.xdef push_shortint .text push_shortint: | Saving %d2 as well is a really dirty trick to reserve four extra bytes on the stack. | Only two are needed, but this is smaller than subtracting and adding. movem.l %d2-%d6/%a5,-(%sp) | Put address of push_quantum into %a5. move.l 0xC8,%a5 move.l (%a5,3000),%a5 /* push_quantum */ | %d4: Number of bytes. clr.w %d4 | Put POSINT_TAG in %d6. moveq.l #31,%d6 | Move parameter to %d3. move.w 28(%sp),%d3 | If it is zero, the value should be zero bytes long. jbeq .L__finished | If negative, put NEGINT_TAG in %d6 and negate it. jbge .L__mainloop moveq.l #32,%d6 neg.w %d3 .L__mainloop: | Push rightmost quantum of the value. move.w %d3,(%sp) jsr (%a5) | Add 1 to the number of bytes. addq.w #1,%d4 | Shift the value to the right by one quantum. lsr.w #8,%d3 | Finished if remaining value is zero. jbne .L__mainloop .L__finished: | Push number of bytes. move.w %d4,(%sp) jsr (%a5) | Push tag. move.w %d6,(%sp) jsr (%a5) | See above. | There is no problem in "restoring" %d2, since it may be trashed. movem.l (%sp)+,%d2-%d6/%a5 rts