combine.c (combine_simplify_rtx): Avoid mis-simplifying conditionals for STORE_FLAG_VALUE==-1 case.

	* combine.c (combine_simplify_rtx): Avoid mis-simplifying conditionals
	for STORE_FLAG_VALUE==-1 case.

Co-Authored-By: Eric Botcazou <ebotcazou@adacore.com>

From-SVN: r172930

gcc/ChangeLog

+2011-04-25  Maxim Kuvyrkov  <maxim@codesourcery.com>
+	    Eric Botcazou <ebotcazou@adacore.com>
+
+	* combine.c (combine_simplify_rtx): Avoid mis-simplifying conditionals
+	for STORE_FLAG_VALUE==-1 case.
+
 2011-04-24  Richard Sandiford  <richard.sandiford@linaro.org>
 
 	PR target/43804

gcc/combine.c

@@ -5787,7 +5787,10 @@ combine_simplify_rtx (rtx x, enum machine_mode op0_mode, int in_dest,
 
 	  /* If STORE_FLAG_VALUE is -1, we have cases similar to
 	     those above.  */
-	  if (STORE_FLAG_VALUE == -1
+	  if (in_cond)
+	    ;
+
+	  else if (STORE_FLAG_VALUE == -1
 	      && new_code == NE && GET_MODE_CLASS (mode) == MODE_INT
 	      && op1 == const0_rtx
 	      && (num_sign_bit_copies (op0, mode)