http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52580
--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-03-14
14:32:49 UTC ---
Confirmed, 4.7 does
418: LOOP VECTORIZED.
398: LOOP VECTORIZED.
335: LOOP VECTORIZED.
316: LOOP VECTORIZED.
280: LOOP VECTORIZED.
262: LOOP VECTORIZED.
213: LOOP VECTORIZED.
vs.
398: LOOP VECTORIZED.
335: LOOP VECTORIZED.
213: LOOP VECTORIZED.
and different amount of alias checks as well.
For the loop at line 316 trunk cannot determine the dependence of some
refs:
316: versioning for alias required: can't determine dependence between
__BLNK__.uold[D.2769_24] and __BLNK__.vnew[D.2782_49]
Reduced testcase:
SUBROUTINE CALC2
IMPLICIT REAL*8 (A-H, O-Z)
PARAMETER (N1=1335, N2=1335)
COMMON U(N1,N2), V(N1,N2), P(N1,N2),
* UNEW(N1,N2), VNEW(N1,N2),
1 PNEW(N1,N2), UOLD(N1,N2),
* VOLD(N1,N2), POLD(N1,N2),
2 CU(N1,N2), CV(N1,N2),
* Z(N1,N2), H(N1,N2), PSI(N1,N2)
COMMON /CONS/ DT,TDT,DX,DY,A,ALPHA,ITMAX,MPRINT,M,N,MP1,
1 NP1,EL,PI,TPI,DI,DJ,PCF
TDTS8 = TDT/8.D0
TDTSDX = TDT/DX
TDTSDY = TDT/DY
DO 200 J=1,N
DO 200 I=1,M
UNEW(I+1,J) = UOLD(I+1,J)+
1 TDTS8*(Z(I+1,J+1)+Z(I+1,J))*(CV(I+1,J+1)+CV(I,J+1)+CV(I,J)
2 +CV(I+1,J))-TDTSDX*(H(I+1,J)-H(I,J))
VNEW(I,J+1) = VOLD(I,J+1)-TDTS8*(Z(I+1,J+1)+Z(I,J+1))
1 *(CU(I+1,J+1)+CU(I,J+1)+CU(I,J)+CU(I+1,J))
2 -TDTSDY*(H(I,J+1)-H(I,J))
PNEW(I,J) = POLD(I,J)-TDTSDX*(CU(I+1,J)-CU(I,J))
1 -TDTSDY*(CV(I,J+1)-CV(I,J))
200 CONTINUE
RETURN
END
