re PR fortran/69154 (ICE in gfc_trans_where_2, at fortran/trans-stmt.c:5005 on *-linux)

2016-01-10  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/69154
	* frontend-passes.c (in_where):  New variable.
	(inline_matmul_assign):  Don't try this if we are within
	a WHERE statement.
	(gfc_code_walker):  Keep track of in_where.

2016-01-10  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/69154
	* gfortran.dg/inline_matmul_12.f90:  New test.

From-SVN: r232201

gcc/fortran/ChangeLog

+2016-01-10  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR fortran/69154
+	* frontend-passes.c (in_where):  New variable.
+	(inline_matmul_assign):  Don't try this if we are within
+	a WHERE statement.
+	(gfc_code_walker):  Keep track of in_where.
+
 2016-01-10  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/67779

gcc/fortran/frontend-passes.c

@@ -78,6 +78,10 @@ static int forall_level;
 
 static bool in_omp_workshare;
 
+/* Keep track of whether we are within a WHERE statement.  */
+
+static bool in_where;
+
 /* Keep track of iterators for array constructors.  */
 
 static int iterator_level;
@@ -2790,6 +2794,9 @@ inline_matmul_assign (gfc_code **c, int *walk_subtrees,
   if (co->op != EXEC_ASSIGN)
     return 0;
 
+  if (in_where)
+    return 0;
+
   expr1 = co->expr1;
   expr2 = co->expr2;
   if (expr2->expr_type != EXPR_FUNCTION
@@ -3268,12 +3275,14 @@ gfc_code_walker (gfc_code **c, walk_code_fn_t codefn, walk_expr_fn_t exprfn,
 	  gfc_code *co;
 	  gfc_association_list *alist;
 	  bool saved_in_omp_workshare;
+	  bool saved_in_where;
 
 	  /* There might be statement insertions before the current code,
 	     which must not affect the expression walker.  */
 
 	  co = *c;
 	  saved_in_omp_workshare = in_omp_workshare;
+	  saved_in_where = in_where;
 
 	  switch (co->op)
 	    {
@@ -3301,6 +3310,10 @@ gfc_code_walker (gfc_code **c, walk_code_fn_t codefn, walk_expr_fn_t exprfn,
 	      WALK_SUBEXPR (co->ext.iterator->step);
 	      break;
 
+	    case EXEC_WHERE:
+	      in_where = true;
+	      break;
+
 	    case EXEC_CALL:
 	    case EXEC_ASSIGN_CALL:
 	      for (a = co->ext.actual; a; a = a->next)
@@ -3554,6 +3567,7 @@ gfc_code_walker (gfc_code **c, walk_code_fn_t codefn, walk_expr_fn_t exprfn,
 	    doloop_level --;
 
 	  in_omp_workshare = saved_in_omp_workshare;
+	  in_where = saved_in_where;
 	}
     }
   return 0;

gcc/testsuite/ChangeLog

+2016-01-10  Thomas Koenig  <tkoenig@gcc.gnu.org>
+
+	PR fortran/69154
+	* gfortran.dg/inline_matmul_12.f90:  New test.
+
 2016-01-10  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/67779

gcc/testsuite/gfortran.dg/inline_matmul_12.f90

+! { dg-do compile }
+! { dg-options "-ffrontend-optimize -fdump-tree-original" }
+! PR 69154 - inlined matmul used to cause an ICE inside a WHERE.
+MODULE m_numeric_tools
+ INTEGER, PARAMETER :: dp=8
+CONTAINS
+subroutine llsfit_svd(xx,yy,sigma,nfuncs,funcs,chisq,par,var,cov,info)
+ real(dp),intent(in) :: xx(:),yy(:),sigma(:)
+ real(dp),dimension(SIZE(xx)) :: bb,sigm1
+ real(dp) :: tmp(nfuncs)
+ real(dp),allocatable :: work(:),Vt(:,:),U(:,:),S(:)
+ real(dp),dimension(3,3) :: a, b, c
+ WHERE (S>TOL_*MAXVAL(S))
+  tmp=MATMUL(bb,U)/S
+ END WHERE
+ call random_number(a)
+ call random_number(b)
+ c = matmul(a,b)
+end subroutine llsfit_svd
+
+END MODULE m_numeric_tools
+! { dg-final { scan-tree-dump-times "matmul_r8" 1 "original" } }