re PR tree-optimization/54634 (miscompilation with -O3 -ftree-loop-distribution)

2012-09-20  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/54634
	* tree-data-ref.c (get_references_in_stmt): For now give
	up for pure functions.

From-SVN: r191567

gcc/ChangeLog

+2012-09-20  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/54634
+	* tree-data-ref.c (get_references_in_stmt): For now give
+	up for pure functions.
+
 2012-09-20  Chen Wei-Ren  <chenwj@iis.sinica.edu.tw>
 
 	doc/lto.texi: Correct typo.

gcc/tree-data-ref.c

@@ -4307,10 +4307,10 @@ get_references_in_stmt (gimple stmt, VEC (data_ref_loc, heap) **references)
   *references = NULL;
 
   /* ASM_EXPR and CALL_EXPR may embed arbitrary side effects.
-     Calls have side-effects, except those to const or pure
-     functions.  */
+     As we cannot model data-references to not spelled out
+     accesses give up if they may occur.  */
   if ((stmt_code == GIMPLE_CALL
-       && !(gimple_call_flags (stmt) & (ECF_CONST | ECF_PURE)))
+       && !(gimple_call_flags (stmt) & ECF_CONST))
       || (stmt_code == GIMPLE_ASM
 	  && (gimple_asm_volatile_p (stmt) || gimple_vuse (stmt))))
     clobbers_memory = true;