frontend-passes.c (matmul_lhs_realloc): Correct allocation size for case A1B2.

2017-05-28  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* frontend-passes.c (matmul_lhs_realloc):  Correct
	allocation size for case A1B2.

2017-05-28  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* gfortran.dg/matmul_bounds_12.f90:  New test.

From-SVN: r248546

gcc/fortran/ChangeLog

+2017-05-28  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	* frontend-passes.c (matmul_lhs_realloc):  Correct
+	allocation size for case A1B2.
+
 2017-05-25  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	* dump-parse-tree.c (show_expr):  Also replace

gcc/fortran/frontend-passes.c

@@ -2447,7 +2447,7 @@ matmul_lhs_realloc (gfc_expr *c, gfc_expr *a, gfc_expr *b,
       break;
 
     case A1B2:
-      ar->start[0] = get_array_inq_function (GFC_ISYM_SIZE, b, 1);
+      ar->start[0] = get_array_inq_function (GFC_ISYM_SIZE, b, 2);
       cond = build_logical_expr (INTRINSIC_NE,
 				 get_array_inq_function (GFC_ISYM_SIZE, c, 1),
 				 get_array_inq_function (GFC_ISYM_SIZE, b, 2));

gcc/testsuite/ChangeLog

+2017-05-28  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	* gfortran.dg/matmul_bounds_12.f90:  New test.
+
 2017-05-27  Jakub Jelinek  <jakub@redhat.com>
 
 	PR bootstrap/80887

gcc/testsuite/gfortran.dg/matmul_bounds_12.f90

+! { dg-do run }
+program main
+  real, dimension(3,2) :: a
+  real, dimension(3) :: bp
+  real, dimension(3) :: res1
+  real, dimension(:), allocatable :: c3
+  real, dimension(2) :: res2
+
+  data a /-2., 3., -5., 7., -11., 13./
+  data bp /-23., -31., -41./
+  data res2 /158., -353./
+
+  c3 = matmul(bp,a)
+  if (size(c3,1) /= 2) call abort
+  if (any(c3 /= res2)) call abort
+
+end program main