Fix PR42326: Handle more carefully convert expressions in chrec_fold_plus and chrec_fold_mult.

2010-03-05  Sebastian Pop  <sebastian.pop@amd.com>

	PR middle-end/42326
	* tree-chrec.c (chrec_fold_plus_1): Do not handle convert expressions
	that contain scevs.
	(chrec_fold_multiply): Same.

	* gfortran.dg/graphite/pr42326.f90: New.
	* gfortran.dg/graphite/pr42326-1.f90: New.

From-SVN: r157244

gcc/ChangeLog

@@ -1,3 +1,10 @@
+2010-03-05  Sebastian Pop  <sebastian.pop@amd.com>
+
+	PR middle-end/42326
+	* tree-chrec.c (chrec_fold_plus_1): Do not handle convert expressions
+	that contain scevs.
+	(chrec_fold_multiply): Same.
+
 2010-03-04  Andrew Pinski  <andrew_pinski@caviumnetworks.com>
 
 	PR c/43248

gcc/testsuite/ChangeLog

@@ -1,3 +1,9 @@
+2010-03-05  Sebastian Pop  <sebastian.pop@amd.com>
+
+	PR middle-end/42326
+	* gfortran.dg/graphite/pr42326.f90: New.
+	* gfortran.dg/graphite/pr42326-1.f90: New.
+
 2010-03-05  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* lib/gnat.exp (gnat_init): Remove GNAT_UNDER_TEST_ORIG.

gcc/testsuite/gfortran.dg/graphite/pr42326-1.f90

@@ -0,0 +1,18 @@
+! { dg-do compile { target i?86-*-* x86_64-*-* } }
+! { dg-require-effective-target ilp32 }
+! { dg-options "-O2 -floop-parallelize-all -fprefetch-loop-arrays -msse2" }
+
+subroutine phasad(t,i,ium)
+  implicit none
+  real t(5,4)
+  integer i,l,ll,ium
+
+  do l=1,2
+     ll=2*l
+     do i=1,ium
+        t(i,ll-1)=t(i,ll-1)+t(i,ll)
+     enddo
+  enddo
+  return
+end subroutine phasad
+

gcc/testsuite/gfortran.dg/graphite/pr42326.f90

@@ -0,0 +1,35 @@
+! { dg-do compile { target i?86-*-* x86_64-*-* } }
+! { dg-require-effective-target ilp32 }
+! { dg-options "-O2 -floop-strip-mine -fprefetch-loop-arrays -msse2" }
+
+subroutine blts ( ldmx, ldmy, v, tmp1, i, j, k)
+  implicit none
+  integer ldmx, ldmy, i, j, k, ip, m, l
+  real*8 tmp, tmp1, v( 5, ldmx, ldmy, *), tmat(5,5)
+
+  do ip = 1, 4
+     do m = ip+1, 5
+        tmp = tmp1 * tmat( m, ip )
+        do l = ip+1, 5
+           tmat( m, l ) =  tmat( m, l ) - tmat( ip, l )
+        end do
+        v( m, i, j, k ) = tmp
+     end do
+  end do
+  return
+end subroutine blts
+
+subroutine phasad(t,i,ium)
+  implicit none
+  real t(5,4)
+  integer i,l,ll,ium
+
+  do l=1,2
+     ll=2*l
+     do i=1,ium
+        t(i,ll-1)=t(i,ll-1)+t(i,ll)
+     enddo
+  enddo
+  return
+end subroutine phasad
+

gcc/tree-chrec.c

@@ -283,6 +283,10 @@ chrec_fold_plus_1 (enum tree_code code, tree type,
 	case POLYNOMIAL_CHREC:
 	  return chrec_fold_plus_poly_poly (code, type, op0, op1);
 
+	CASE_CONVERT:
+	  if (tree_contains_chrecs (op1, NULL))
+	    return chrec_dont_know;
+
 	default:
 	  if (code == PLUS_EXPR || code == POINTER_PLUS_EXPR)
 	    return build_polynomial_chrec
@@ -296,6 +300,10 @@ chrec_fold_plus_1 (enum tree_code code, tree type,
 	       CHREC_RIGHT (op0));
 	}
 
+    CASE_CONVERT:
+      if (tree_contains_chrecs (op0, NULL))
+	return chrec_dont_know;
+
     default:
       switch (TREE_CODE (op1))
 	{
@@ -314,6 +322,10 @@ chrec_fold_plus_1 (enum tree_code code, tree type,
 				    ? build_real (type, dconstm1)
 				    : build_int_cst_type (type, -1)));
 
+	CASE_CONVERT:
+	  if (tree_contains_chrecs (op1, NULL))
+	    return chrec_dont_know;
+
 	default:
 	  {
 	    int size = 0;
@@ -393,6 +405,10 @@ chrec_fold_multiply (tree type,
 	case POLYNOMIAL_CHREC:
 	  return chrec_fold_multiply_poly_poly (type, op0, op1);
 
+	CASE_CONVERT:
+	  if (tree_contains_chrecs (op1, NULL))
+	    return chrec_dont_know;
+
 	default:
 	  if (integer_onep (op1))
 	    return op0;
@@ -405,6 +421,10 @@ chrec_fold_multiply (tree type,
 	     chrec_fold_multiply (type, CHREC_RIGHT (op0), op1));
 	}
 
+    CASE_CONVERT:
+      if (tree_contains_chrecs (op0, NULL))
+	return chrec_dont_know;
+
     default:
       if (integer_onep (op0))
 	return op1;
@@ -420,6 +440,10 @@ chrec_fold_multiply (tree type,
 	     chrec_fold_multiply (type, CHREC_LEFT (op1), op0),
 	     chrec_fold_multiply (type, CHREC_RIGHT (op1), op0));
 
+	CASE_CONVERT:
+	  if (tree_contains_chrecs (op1, NULL))
+	    return chrec_dont_know;
+
 	default:
 	  if (integer_onep (op1))
 	    return op0;