re PR tree-optimization/50222 (ICE with -O{1,2} -funswitch-loops -ftree-loop-distribution)

2012-12-05  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/50222
	* gcc.dg/torture/pr50222.c: New testcase.

From-SVN: r194188

gcc/testsuite/ChangeLog

 2012-12-05  Richard Biener  <rguenther@suse.de>
 
+	PR tree-optimization/50222
+	* gcc.dg/torture/pr50222.c: New testcase.
+
+2012-12-05  Richard Biener  <rguenther@suse.de>
+
 	PR lto/55525
 	* gcc.dg/lto/pr55525_0.c: New testcase.
 	* gcc.dg/lto/pr55525_1.c: Likewise.

gcc/testsuite/gcc.dg/torture/pr50222.c

+/* { dg-do compile } */
+/* { dg-options "-funswitch-loops -ftree-loop-distribution" } */
+
+typedef struct AVProgram {
+    void *priv_data;
+    unsigned int nb_streams;
+} AVFormatContext;
+typedef struct {
+    unsigned short flags;
+    unsigned char stream_id;
+} FrameCode;
+typedef struct {
+    FrameCode frame_code[256];
+} NUTContext;
+void build_frame_code(AVFormatContext *s, int stream_id,
+		      int is_audio, int pred_count)
+{
+  NUTContext *nut = s->priv_data;
+  int keyframe_0_esc = s->nb_streams > 2;
+  int start2 = 1 + 253*stream_id / s->nb_streams;
+  int key_frame;
+  for(key_frame=0; key_frame<2; key_frame++)
+    {
+      FrameCode *ft;
+      if (is_audio && keyframe_0_esc && key_frame==0)
+	continue;
+      ft= &nut->frame_code[start2];
+      ft->flags|= 3;
+      ft->stream_id= stream_id;
+    }
+}