re PR fortran/56318 (Wrong result with MATMUL of PARAMETER)

2013-02-14  Tobias Burnus  <burnus@net-b.de>
            Mikael Morin  <mikael@gcc.gnu.org>

        PR fortran/56318
        * simplify.c (gfc_simplify_matmul): Fix result shape
        and matmul result.

2013-02-14  Tobias Burnus  <burnus@net-b.de>

        PR fortran/56318
        * gcc/testsuite/gfortran.dg/matmul_9.f90: New.


Co-Authored-By: Mikael Morin <mikael@gcc.gnu.org>

From-SVN: r196075

gcc/fortran/ChangeLog

 2013-02-15  Tobias Burnus  <burnus@net-b.de>
+	    Mikael Morin  <mikael@gcc.gnu.org>
+
+	PR fortran/56318
+	* simplify.c (gfc_simplify_matmul): Fix result shape
+	and matmul result.
+
+2013-02-15  Tobias Burnus  <burnus@net-b.de>
 
 	PR fortran/53818
 	* resolve.c (apply_default_init_local): Don't create an

gcc/fortran/simplify.c

@@ -3850,7 +3850,7 @@ gfc_simplify_matmul (gfc_expr *matrix_a, gfc_expr *matrix_b)
   if (matrix_a->rank == 1 && matrix_b->rank == 2)
     {
       result_rows = 1;
-      result_columns = mpz_get_si (matrix_b->shape[0]);
+      result_columns = mpz_get_si (matrix_b->shape[1]);
       stride_a = 1;
       stride_b = mpz_get_si (matrix_b->shape[0]);
 
@@ -3860,7 +3860,7 @@ gfc_simplify_matmul (gfc_expr *matrix_a, gfc_expr *matrix_b)
     }
   else if (matrix_a->rank == 2 && matrix_b->rank == 1)
     {
-      result_rows = mpz_get_si (matrix_b->shape[0]);
+      result_rows = mpz_get_si (matrix_a->shape[0]);
       result_columns = 1;
       stride_a = mpz_get_si (matrix_a->shape[0]);
       stride_b = 1;
@@ -3873,7 +3873,7 @@ gfc_simplify_matmul (gfc_expr *matrix_a, gfc_expr *matrix_b)
     {
       result_rows = mpz_get_si (matrix_a->shape[0]);
       result_columns = mpz_get_si (matrix_b->shape[1]);
-      stride_a = mpz_get_si (matrix_a->shape[1]);
+      stride_a = mpz_get_si (matrix_a->shape[0]);
       stride_b = mpz_get_si (matrix_b->shape[0]);
 
       result->rank = 2;

gcc/testsuite/ChangeLog

 2013-02-15  Tobias Burnus  <burnus@net-b.de>
 
+	PR fortran/56318
+	* gcc/testsuite/gfortran.dg/matmul_9.f90: New.
+
+2013-02-15  Tobias Burnus  <burnus@net-b.de>
+
 	PR fortran/53818
 	* gfortran.dg/init_flag_11.f90: New.
 

gcc/testsuite/gfortran.dg/matmul_9.f90

+! { dg-do run }
+! { dg-options "-fdump-tree-original" }
+!
+! PR fortran/56318
+!
+! Contributed by Alberto Luaces
+!
+SUBROUTINE mass_matrix        
+  DOUBLE PRECISION,PARAMETER::m1=1.d0
+  DOUBLE PRECISION,DIMENSION(3,2),PARAMETER::A1=reshape([1.d0,0.d0, 0.d0, &
+       0.d0,1.d0, 0.d0],[3,2])
+  DOUBLE PRECISION,DIMENSION(2,2),PARAMETER::Mel=reshape([1.d0/3.d0, 0.d0, &
+       0.d0, 1.d0/3.d0],[2,2])
+
+  DOUBLE PRECISION,DIMENSION(3,3)::MM1
+
+  MM1=m1*matmul(A1,matmul(Mel,transpose(A1)))
+  !print '(3f8.3)', MM1
+  if (any (abs (MM1 &
+                - reshape ([1.d0/3.d0, 0.d0,      0.d0,  &
+                            0.d0,      1.d0/3.d0, 0.d0,  &
+                            0.d0,      0.d0,      0.d0], &
+                           [3,3])) > epsilon(1.0d0))) &
+    call abort ()
+END SUBROUTINE mass_matrix
+
+program name
+  implicit none
+  integer, parameter :: A(3,2) = reshape([1,2,3,4,5,6],[3,2])
+  integer, parameter :: B(2,3) = reshape([3,17,23,31,43,71],[2,3])
+  integer, parameter :: C(3)   = [-5,-7,-21]
+  integer, parameter :: m1 = 1
+
+!  print *, matmul(B,C)
+   if (any (matmul(B,C) /= [-1079, -1793])) call abort()
+!  print *, matmul(C,A)
+   if (any (matmul(C,A) /= [-82, -181])) call abort()
+!  print '(3i5)', m1*matmul(A,B)
+  if (any (m1*matmul(A,B) /= reshape([71,91,111, 147,201,255, 327,441,555],&
+                                     [3,3]))) &
+     call abort()
+  call mass_matrix
+end program name
+
+! { dg-final { scan-tree-dump-times "matmul" 0 "original" } }
+! { dg-final { cleanup-tree-dump "original" } }
+