[patch, fortran] Fix PR 66385, array constructors in FORALL

[patch, fortran] Fix PR 66385, array constructors in FORALL

[Thomas Koenig]

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Hello world,

front-end optimization and FORALL do not appear to mix well.

This patch fixes an ICE resulting from an attempt by front-end
optimization to use a BLOCK inside a FORALL statement.

I will commit this as obvious in a day or so unless somebody objects.
I will also backport (time to install the gcc 5 branch...)

There would be an alternative, in principle, to put the BLOCK around
the FORALL, but frankly, I don't think it is worth spending the
effort and complicating the code.

Regards

	Thomas

2015-06-11  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/66385
	* frontend-passes.c (combine_array_constructor): Return early if
	inside a FORALL loop.

2015-06-11  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/66385
	* gfortran.dg/forall_17.f90:  New test.


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! { dg-do compile }
! { dg-options "-ffrontend-optimize" }
! PR fortran/66385 - this used to ICE
! Original test case by Mianzhi Wang
program test
  double precision::aa(30)
  double precision::a(3,3),b
  b=1d0
  forall(i=1:3)
    a(:,i)=b*[1d0,2d0,3d0]
  end forall

  forall(i=1:10)
    aa(10*[0,1,2]+i)=1d0
  end forall

end program

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Index: frontend-passes.c
===================================================================
--- frontend-passes.c	(Revision 223876)
+++ frontend-passes.c	(Arbeitskopie)
@@ -1243,6 +1243,10 @@ combine_array_constructor (gfc_expr *e)
   if (in_assoc_list)
     return false;
 
+  /* With FORALL, the BLOCKS created by create_var will cause an ICE.  */
+  if (forall_level > 0)
+    return false;
+
   op1 = e->value.op.op1;
   op2 = e->value.op.op2;