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Annotation of researchv10dc/cmd/icon/setup/att3b20/rover.s, revision 1.1.1.1

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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