Reduction Kind

• Reduction in HPF

  • Reduction variables may appear only in "reduction statements.” (i.e. S=S+X)

• Reduction in HPF/JA

  • Reduction variables may appear in any statements as long as the user knows " It's reduction."
  • Users specify reduction kind in the REDUCTION clause.
  • FISTLOC/LASTLOC for MAX/MIN is supported.

!HPF$ INDEPENDENT, REDUCTION:SUM(S), &
!HPF$ REDUCTION:MAXVAL(QMAX:FIRSTLOC(ILOC))
DO I=…
CALL SUB(SUM)
IF(QMAX.LT.Q(I)) THEN
QMAX = Q(I)
ILOC = I
ENDIF
ENDDO

SUBROUTINE SUB(SUM)
．．．
SUB = SUB + X
．．．
END

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