2.9BSD - /usr/src/lib/c/nonfpcrt/lmul.s

   1: /
   2: / 32-bit multiplication routine for fixed pt hardware.
   3: /  Implements * operator
   4: / Credit to an unknown author who slipped it under the door.
   5: .globl  lmul
   6: .globl  csv, cret
   7: 
   8: lmul:
   9:         jsr     r5,csv
  10:         mov     6(r5),r2
  11:         sxt     r1
  12:         sub     4(r5),r1
  13:         mov     10.(r5),r0
  14:         sxt     r3
  15:         sub     8.(r5),r3
  16:         mul     r0,r1
  17:         mul     r2,r3
  18:         add     r1,r3
  19:         mul     r2,r0
  20:         sub     r3,r0
  21:         jmp     cret

Defined functions