[PATCH] Fix PR82795

[Richard Biener]

Bootstrapped and tested on x86_64-unknown-linux-gnu, applied.

Richard.

2017-11-02  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/82795
	* tree-if-conv.c (predicate_mem_writes): Remove bogus assert.

	* gcc.target/i386/pr82795.c: New testcase.

Index: gcc/tree-if-conv.c
===================================================================
--- gcc/tree-if-conv.c	(revision 254211)
+++ gcc/tree-if-conv.c	(working copy)
@@ -2247,10 +2247,7 @@ predicate_mem_writes (loop_p loop)
 					 TREE_OPERAND (cond, 0),
 					 TREE_OPERAND (cond, 1));
 		  else
-		    {
-		      gcc_assert (TREE_CODE (cond) == SSA_NAME);
-		      mask = cond;
-		    }
+		    mask = cond;
 
 		  if (swap)
 		    {
Index: gcc/testsuite/gcc.target/i386/pr82795.c
===================================================================
--- gcc/testsuite/gcc.target/i386/pr82795.c	(nonexistent)
+++ gcc/testsuite/gcc.target/i386/pr82795.c	(working copy)
@@ -0,0 +1,23 @@
+/* { dg-do compile } */
+/* { dg-options "-O3 -mavx2" } */
+
+void
+sj (int qh, int rn, int *by)
+{
+  for (;;)
+    if (qh != 0)
+      {
+	int dc;
+
+	for (dc = 0; dc < 17; ++dc)
+	  {
+	    int nn;
+
+	    nn = (rn != 0) ? qh : dc;
+	    if (nn != 0)
+	      qh = nn;
+	    else
+	      qh = (qh != 0) ? *by : dc;
+	  }
+      }
+}