2012-06-18 Richard Guenther <rguenther@suse.de>

	PR tree-optimization/53693
	* tree-vect-patterns.c (vect_operation_fits_smaller_type):
	Reject operands with more than one use.

	* g++.dg/torture/pr53693.C: New testcase.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@188733 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 21 insertions, 0 deletions

diff --git a/gcc/testsuite/g++.dg/torture/pr53693.C b/gcc/testsuite/g++.dg/torture/pr53693.C
new file mode 100644
index 00000000000..b67a484b969
--- /dev/null
+++ b/gcc/testsuite/g++.dg/torture/pr53693.C
@@ -0,0 +1,21 @@
+// { dg-do compile }
+
+void
+filter_scanlines (void *src_buffer, void *dst_buffer, int dst_pitch, int width)
+{
+  int x;
+  unsigned short *src, *dst_a, *dst_b;
+
+  src = (unsigned short *) src_buffer;
+  dst_a = (unsigned short *) dst_buffer;
+  dst_b = ((unsigned short *) dst_buffer) + (dst_pitch >> 1);
+
+  for (x = 0; x < width; x++)
+    {
+      unsigned char gs, gh;
+      gs = src[x];
+      gh = gs + (gs >> 1);
+      dst_a[x] = (gh << 5) | (gh);
+      dst_b[x] = ((gs  - gh) << 5)  | (gs  - gh);
+    }
+}