gcc/testsuite/gfortran.fortran-torture/execute/pr40021.f

   1 C Derived from lapack
   2         PROGRAM test
   3         DOUBLE PRECISION DA
   4         INTEGER I, N
   5         DOUBLE PRECISION DX(9),DY(9)
   6
   7         EXTERNAL DAXPY
   8         N=5
   9         DA=1.0
  10         DATA DX/-2, -1, -3, -4, 1, 2, 10, 15, 14/
  11         DATA DY/0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0/
  12         CALL DAXPY (N,DA,DX,DY)
  13         DO 10 I = 1, N
  14           if (DX(I).ne.DY(I)) call abort
  15 10      CONTINUE
  16         STOP
  17         END
  18
  19       SUBROUTINE DAXPY(N,DA,DX,DY)
  20       DOUBLE PRECISION DA
  21       INTEGER N
  22       DOUBLE PRECISION DX(*),DY(*)
  23       INTEGER I,IX,IY,M,MP1
  24       INTRINSIC MOD
  25       IF (N.LE.0) RETURN
  26    20 M = MOD(N,4)
  27       IF (M.EQ.0) GO TO 40
  28       DO 30 I = 1,M
  29           DY(I) = DY(I) + DA*DX(I)
  30    30 CONTINUE
  31       IF (N.LT.4) RETURN
  32    40 MP1 = M + 1
  33       DO 50 I = MP1,N,4
  34           DY(I) = DY(I) + DA*DX(I)
  35           DY(I+1) = DY(I+1) + DA*DX(I+1)
  36           DY(I+2) = DY(I+2) + DA*DX(I+2)
  37           DY(I+3) = DY(I+3) + DA*DX(I+3)
  38    50 CONTINUE
  39       RETURN
  40       END