+2009-03-19 Li Feng <nemokingdom@gmail.com>
+
+ PR middle-end/39500
+ * tree-data-ref.c (analyze_subscript_affine_affine): There is no
+ dependence if the first conflict is after niter iterations.
+
2009-03-19 Hans-Peter Nilsson <hp@axis.com>
PR middle-end/38609
+2009-03-19 Li Feng <nemokingdom@gmail.com>
+
+ PR middle-end/39500
+ * gcc.dg/autopar/pr39500-1.c: New.
+ * gcc.dg/autopar/pr39500-2.c: New.
+
2009-03-18 H.J. Lu <hongjiu.lu@intel.com>
* g++.dg/dg.exp: Prune graphite.
--- /dev/null
+/* pr39500: autopar fails to parallel */
+/* origin: nemokingdom@gmail.com(LiFeng) */
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-parallelize-loops=4 -fdump-tree-parloops-details" } */
+
+void abort (void);
+
+int main (void)
+{
+ int i;
+ int x[1000];
+
+ for (i = 0; i < 100; i++)
+ x[i] = x[i+100];
+
+ for (i = 0; i < 100; i++)
+ {
+ if (x[i] != x[i+100])
+ abort ();
+ }
+
+ return 0;
+}
+
+/* Check that the first loop in parloop got parallelized. */
+
+/* { dg-final { scan-tree-dump-times "SUCCESS: may be parallelized" 1 "parloops" } } */
+/* { dg-final { cleanup-tree-dump "parloops" } } */
--- /dev/null
+/* pr39500: autopar fails to parallel */
+/* origin: nemokingdom@gmail.com(LiFeng) */
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-parallelize-loops=4 -fdump-tree-parloops-details" } */
+
+int main (void)
+{
+ int i;
+ int x[1000];
+
+ for (i = 0; i < 101; i++)
+ x[i] = x[i+100];
+
+ return x[12];
+}
+
+/* This loop cannot be parallelized due to a dependence. */
+
+/* { dg-final { scan-tree-dump-times "SUCCESS: may be parallelized" 0 "parloops" } } */
+/* { dg-final { cleanup-tree-dump "parloops" } } */
/* If the overlap occurs outside of the bounds of the
loop, there is no dependence. */
- if (x1 > niter || y1 > niter)
+ if (x1 >= niter || y1 >= niter)
{
*overlaps_a = conflict_fn_no_dependence ();
*overlaps_b = conflict_fn_no_dependence ();