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Annotation of researchv10no/cmd/PDP11/crt/almul.s, revision 1.1.1.1

1.1       root        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 almul
                      6: .globl csv, cret
                      7: 
                      8: almul:
                      9:        jsr     r5,csv
                     10:        mov     4(r5),r4
                     11:        mov     2(r4),r2
                     12:        sxt     r1
                     13:        sub     (r4),r1
                     14:        mov     8.(r5),r0
                     15:        sxt     r3
                     16:        sub     6.(r5),r3
                     17:        mul     r0,r1
                     18:        mul     r2,r3
                     19:        add     r1,r3
                     20:        mul     r2,r0
                     21:        sub     r3,r0
                     22:        mov     r0,(r4)+
                     23:        mov     r1,(r4)
                     24:        jmp     cret

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