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the usage of "call" instruction

Jane
Intellectual 2260 points

Hi Champs,

              We find there're 'call" instruction in the assembly files which is generated by the compiler tools.  We did not find the detail usage in the spru732 document for example the delay cycles.

             Below are one extract from assembly file generated by compiler tools. Looks the delay slot is 3 ?

Case1:           

           CALL    .S1     _BsamGetHData1Zone_Opt ; |264|
           MV      .L2X    A11,B4            ; |264|
           ADDKPC  .S2     $C$RL4,B3,2       ; |264|

           MV      .L1     A8,A4             ; |264|
||         ADD     .S1X    8,SP,A6           ; |264|
||         MV      .L2X    A12,B6            ; |264|

$C$RL4:    ; CALL OCCURS {_BsamGetHData1Zone_Opt}  ; |264|
;** --------------------------------------------------------------------------*

           B       .S1     $C$L26            ; |264|
||         ADDAD   .D1     A12,8,A4          ; |268|

           LDW     .D1T1   *A4++,A3          ; |275|
           LDW     .D1T1   *A4++,A5          ; |275|
           LDW     .D1T1   *A4++,A8          ; |275|
           LDW     .D1T1   *A4++,A7          ; |275|
           LDW     .D1T1   *A4++,A6          ; |275|
           ; BRANCH OCCURS {$C$L26}          ; |264|

 

Thanks in advance!

Jane

  • 0
    TI__Expert 4930 points

    Jane said:

               CALL    .S1     _BsamGetHData1Zone_Opt ; |264|
               MV      .L2X    A11,B4            ; |264|
               ADDKPC  .S2     $C$RL4,B3,2       ; |264|

               MV      .L1     A8,A4             ; |264|
    ||         ADD     .S1X    8,SP,A6           ; |264|
    ||         MV      .L2X    A12,B6            ; |264|

    The ADDKPC instruction encodes two additional NOP cycles with its third operand, 2.  Thus the MV takes one, the ADDKPC takes one, two NOPs are inserted, and the three parallel instructions take another one, for the five delay cycles of a CALL instruction.

    ADDKPC is described on page 3-62 in spru732c.