Library /sys$common/syshlp/dbg$help.hlb DEBUG, SET, VECTOR_MODE, Examples  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    1.DBG> SET VECTOR_MODE SYNCHRONIZED

      This command causes the debugger to force synchronization
      between the scalar and vector processors after each vector
      instruction is executed.

    2.DBG> SHOW VECTOR_MODE

      Vector mode is nonsynchronized
      DBG> SET VECTOR_MODE SYNCHRONIZED   1
      DBG> SHOW VECTOR_MODE
      Vector mode is synchronized
      DBG> STEP   2
      stepped to .MAIN.\SUB\%LINE 99
          99:         VVDIVD  V1,V0,V2
      DBG> STEP   3
      %SYSTEM-F-VARITH, vector arithmetic fault, summary=00000002,
                        mask=00000004, PC=000002E1, PSL=03C00010
      break on unhandled exception preceding .MAIN.\SUB\%LINE 100
         100:         CLRL    R0
      DBG>

      The comments that follow refer to the callouts in the previous
      example:

      1  The SET VECTOR_MODE SYNCHRONIZED command causes the debugger
         to force automatic synchronization between the scalar and
         vector processors whenever a vector instruction is executed.

      2  This STEP command suspends program execution on line 99,
         just before a VVDIVD instruction is executed. Assume that,
         in this example, the instruction will trigger a floating-
         point divide-by-zero exception.

      3  This STEP command executes the VVDIVD instruction, which
         triggers the exception. The vector exception is delivered
         immediately because the debugger is being operated in
         synchronized vector mode.