re PR fortran/37131 (inline matmul for small matrix sizes)

2017-05-01  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/37131
	* frontend-passes.c (inline_matmul_assign): Also check bounds
	for allocatable lhs and matrix-vector-multiplication.

2017-05-01  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/37131
	* gfortran.dg/matmul_bounds_11.f90:  New test.

From-SVN: r247441

gcc/fortran/ChangeLog

+2017-05-01  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR fortran/37131
+	* frontend-passes.c (inline_matmul_assign): Also check bounds
+	for allocatable lhs and matrix-vector-multiplication.
+
 2017-04-23  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 
 	PR fortran/80484

gcc/fortran/frontend-passes.c

@@ -3066,9 +3066,10 @@ inline_matmul_assign (gfc_code **c, int *walk_subtrees,
       gfc_code *lhs_alloc;
 
       /* Only need to check a single dimension for the A2B2 case for
-	 bounds checking, the rest will be allocated.  */
+	 bounds checking, the rest will be allocated.  Also check this
+	 for A2B1.   */
 
-      if (gfc_option.rtcheck & GFC_RTCHECK_BOUNDS && m_case == A2B2)
+      if ((gfc_option.rtcheck & GFC_RTCHECK_BOUNDS) && (m_case == A2B2 || m_case == A2B1))
 	{
 	  gfc_code *test;
 	  gfc_expr *a2, *b1;

gcc/testsuite/ChangeLog

+2017-05-01  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR fortran/37131
+	* gfortran.dg/matmul_bounds_11.f90:  New test.
+
 2017-05-01  Martin Sebor  <msebor@redhat.com>
 
 	PR tree-optimization/79715

gcc/testsuite/gfortran.dg/matmul_bounds_11.f90

+! { dg-do run }
+! { dg-options "-O -finline-matmul-limit=30 -fcheck=all" }
+! { dg-shouldfail "Dimension of array B incorrect in MATMUL intrinsic" }
+program main
+  real, dimension(:,:), allocatable :: a
+  real, dimension(:), allocatable :: b
+  real, dimension(:), allocatable :: res
+  allocate (a(2,2), b(3))
+  call random_number(a)
+  call random_number(b)
+  res = matmul(a,b)
+  print *,res
+end program main
+! { dg-output "Fortran runtime error: Dimension of array B incorrect in MATMUL intrinsic.*" }
+