[Bug middle-end/40029] [4.5 Regression] Big degradation on swim/mgrid on powerpc 32/64 after alias improvement merge (gcc r145494)

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2009-05-21 14:10 -------
Testcase:

      SUBROUTINE CALC1                                                          
      IMPLICIT REAL*8   (A-H, O-Z)                                              
      PARAMETER (N1=1335, N2=1335)                                              
      COMMON  U(N1,N2), V(N1,N2), P(N1,N2),                                     
     2        CU(N1,N2), CV(N1,N2),                                             
     *        Z(N1,N2), H(N1,N2)                                                
      COMMON /CONS/ DX,DY                                                       
      FSDX = 4.D0/DX                                                            
      FSDY = 4.D0/DY                                                            
      DO 100 J=1,N                                                              
      DO 100 I=1,M                                                              
      CU(I+1,J) = .5D0*(P(I+1,J)+P(I,J))*U(I+1,J)                               
      CV(I,J+1) = .5D0*(P(I,J+1)+P(I,J))*V(I,J+1)                               
      Z(I+1,J+1) = (FSDX*(V(I+1,J+1)-V(I,J+1))-FSDY*(U(I+1,J+1)                 
     1          -U(I+1,J)))/(P(I,J)+P(I+1,J)+P(I+1,J+1)+P(I,J+1))               
      H(I,J) = P(I,J)+.25D0*(U(I+1,J)*U(I+1,J)+U(I,J)*U(I,J)                    
     1               +V(I,J+1)*V(I,J+1)+V(I,J)*V(I,J))                          
  100 CONTINUE                                                                  
      RETURN                                                                    
      END


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40029