re PR tree-optimization/57275 (Error in data dependence analysis during gather vectorization)

2013-05-15  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/57275
	* tree-vect-data-refs.c (vect_analyze_data_ref_dependence): Fix
	return value for fail to do runtime alias checks for gather loads.

	* gcc.target/i386/pr57275.c: New testcase.

From-SVN: r198918

2 files changed, 44 insertions, 0 deletions

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 383dc9d..984ee6d 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2013-05-15  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/57275
+	* gcc.target/i386/pr57275.c: New testcase.
+
 2013-05-15  Jan Hubicka  <jh@suse.cz>
 
 	* gcc.dg/lto/attr-weakref-1_0.c: New testcase.
diff --git a/gcc/testsuite/gcc.target/i386/pr57275.c b/gcc/testsuite/gcc.target/i386/pr57275.c
new file mode 100644
index 0000000..01b9bb4
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr57275.c
@@ -0,0 +1,39 @@
+/* { dg-do run } */
+/* { dg-options "-O3 -march=native" } */
+
+extern void abort (void);
+
+#define N 1024
+
+float a[N], b[N], c[N];
+int k[N];
+
+__attribute__((noinline, noclone)) void
+f (void)
+{
+  int i;
+  for (i = 0; i < N; i++)
+    {
+      a[i] = b[k[i]];
+      b[i] = c[i];
+    }
+}
+
+int main ()
+{
+  int i;
+
+  for (i = 0; i < N; i++)
+  {
+    k[i] = i%2;
+    b[i] = i;
+    c[i] = 179;
+  }
+
+  f ();
+
+  if (a[2] != 179 || a[3] != 179)
+    abort ();
+
+  return 0;
+}