re PR rtl-optimization/8848 (bad code when optimizing (lifetime analysis pass?))

        PR opt/8848
        * ifcvt.c (noce_process_if_block): Correct arguments to
        modified_between_p for no-else-block case.
        * gcc.c-torture/execute/20030120-2.c: New.

From-SVN: r61532

gcc/ChangeLog

+2003-01-20  Richard Henderson  <rth@redhat.com>
+
+	PR opt/8848
+	* ifcvt.c (noce_process_if_block): Correct arguments to
+	modified_between_p for no-else-block case.
+
 2003-01-20  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* config/h8300/h8300.c (const_costs): Remove a warning.

gcc/ifcvt.c

@@ -1809,7 +1809,8 @@ noce_process_if_block (ce_info)
 	  || reg_overlap_mentioned_p (x, cond)
 	  || reg_overlap_mentioned_p (x, a)
 	  || reg_overlap_mentioned_p (x, SET_SRC (set_b))
-	  || modified_between_p (x, if_info.cond_earliest, NEXT_INSN (jump)))
+	  || modified_between_p (SET_SRC (set_b),
+				 PREV_INSN (if_info.cond_earliest), jump))
 	insn_b = set_b = NULL_RTX;
     }
   b = (set_b ? SET_SRC (set_b) : x);

gcc/testsuite/gcc.c-torture/execute/20030120-2.c

+/* PR 8848 */
+
+extern void abort ();
+
+int foo(int status)
+{
+  int s = 0;
+  if (status == 1) s=1;
+  if (status == 3) s=3;
+  if (status == 4) s=4;
+  return s;
+}
+
+int main()
+{
+  if (foo (3) != 3)
+    abort ();
+  return 0;
+}