re PR tree-optimization/80705 (Incorrect code generated for profile counter updates due to SLP+LIM)

2017-05-11  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/80705
	* tree-vect-data-refs.c (vect_analyze_data_refs): DECL_NONALIASED
	bases are not vectorizable.

	* gcc.dg/vect/bb-slp-pr80705.c: New testcase.

From-SVN: r247906

gcc/ChangeLog

+2017-05-11  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/80705
+	* tree-vect-data-refs.c (vect_analyze_data_refs): DECL_NONALIASED
+	bases are not vectorizable.
+
 2017-05-11  Bin Cheng  <bin.cheng@arm.com>
 
 	* tree-ssa-loop-ivopts.c (determine_set_costs): Skip non-interger

gcc/testsuite/ChangeLog

+2017-05-11  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/80705
+	* gcc.dg/vect/bb-slp-pr80705.c: New testcase.
+
 2017-05-11  Nathan Sidwell  <nathan@acm.org>
 
 	* lib/scanlang.exp: New.

gcc/testsuite/gcc.dg/vect/bb-slp-pr80705.c

+/* { dg-do compile } */
+/* { dg-require-profiling "-fprofile-generate" } */
+/* { dg-additional-options "-fprofile-generate" } */
+
+extern int isspace (int);
+
+int foo(const char *txt, char *buf)
+{
+  const char *s;
+  char *d;
+  int ws = 1;
+  for (s=txt, d=buf; *s; )
+    {
+      if (*s=='/' && *(s+1)=='/') {
+
+	  s += 2;
+	  while (*s && *s!='\r' && *s!='\n')
+	    s++;
+      }
+      else if (*s=='"') {
+
+	  s++;
+	  while (*s && *s!='\r' && *s!='\n' && *s!='"')
+	    if (*s++=='\\')
+	      s++;
+	  if (*s=='"')
+	    s++;
+      }
+      else {
+	  if (*s && !isspace(*s))
+	    ws = 0;
+
+
+	  *d++ = *s++;
+
+      }
+    }
+  *d = '\0';
+
+  return ws;
+}
+
+/* { dg-final { scan-tree-dump "base object not addressable" "slp1" } } */
+/* { dg-final { scan-tree-dump-not "MEM\[^\r\n\]*__gcov\[^\r\n\]* = vect_cst" "slp1" } } */

gcc/tree-vect-data-refs.c

@@ -3957,6 +3957,27 @@ again:
 	  datarefs[i] = dr;
 	}
 
+      if (TREE_CODE (DR_BASE_ADDRESS (dr)) == ADDR_EXPR
+	  && VAR_P (TREE_OPERAND (DR_BASE_ADDRESS (dr), 0))
+	  && DECL_NONALIASED (TREE_OPERAND (DR_BASE_ADDRESS (dr), 0)))
+	{
+          if (dump_enabled_p ())
+            {
+              dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
+                               "not vectorized: base object not addressable "
+			       "for stmt: ");
+              dump_gimple_stmt (MSG_MISSED_OPTIMIZATION, TDF_SLIM, stmt, 0);
+            }
+          if (is_a <bb_vec_info> (vinfo))
+	    {
+	      /* In BB vectorization the ref can still participate
+	         in dependence analysis, we just can't vectorize it.  */
+	      STMT_VINFO_VECTORIZABLE (stmt_info) = false;
+	      continue;
+	    }
+	  return false;
+	}
+
       /* Set vectype for STMT.  */
       scalar_type = TREE_TYPE (DR_REF (dr));
       STMT_VINFO_VECTYPE (stmt_info)