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Annotation of researchv10dc/cmd/icon/setup/att3b20/rover.s, revision 1.1

1.1     ! root        1:        .file "rover.s"
        !             2: 
        !             3:        .globl  ckadd
        !             4:        .globl  cksub
        !             5:        .globl  ckmul
        !             6: 
        !             7:        .text
        !             8:        .align  1
        !             9: ckadd: save    &0
        !            10:        addw3   4(%ap),0(%ap),%r0       # Perform addition
        !            11:        jvs     oflow           # Branch if overflow
        !            12:        ret     &0              # Return result in r0
        !            13: 
        !            14:        .align  4
        !            15: cksub: save    &0
        !            16:        subw3   4(%ap),0(%ap),%r0       # Perform subtraction
        !            17:        jvs     oflow           # Branch if overflow
        !            18:        ret     &0              # Return result in r0
        !            19: 
        !            20:        .align  4
        !            21: ckmul: save    &0
        !            22:        mulw3   4(%ap),0(%ap),%r0       # Perform multiplication
        !            23:        jvs     oflow           # Branch if overflow
        !            24:        ret     &0              # Return result in r0
        !            25: 
        !            26: oflow:                         # Got overflow on an operation
        !            27:        pushw   &203
        !            28:        pushw   &0
        !            29:        call    &2,runerr               # runerr(203,0)

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