re PR debug/42629 ("-fcompare-debug failure (length)" with "-O1 -fsched-pressure -fschedule-insns")

gcc/ChangeLog:
PR debug/42629
* haifa-sched.c (dying_use_p): Debug insns don't count.
gcc/testsuite/ChangeLog:
PR debug/42629
* gcc.dg/pr42629.c: New.

From-SVN: r155763

gcc/ChangeLog

 2010-01-09  Alexandre Oliva  <aoliva@redhat.com>
 
+	PR debug/42629
+	* haifa-sched.c (dying_use_p): Debug insns don't count.
+
+2010-01-09  Alexandre Oliva  <aoliva@redhat.com>
+
 	PR middle-end/42363
 	* gimplify.c (gimplify_modify_expr): Drop lhs on noreturn calls.
 	* tree-cfg.c (is_ctrl_altering_stmt): Don't compute flags twice.

gcc/haifa-sched.c

@@ -766,7 +766,8 @@ dying_use_p (struct reg_use_data *use)
   struct reg_use_data *next;
 
   for (next = use->next_regno_use; next != use; next = next->next_regno_use)
-    if (QUEUE_INDEX (next->insn) != QUEUE_SCHEDULED)
+    if (NONDEBUG_INSN_P (next->insn)
+	&& QUEUE_INDEX (next->insn) != QUEUE_SCHEDULED)
       return false;
   return true;
 }

gcc/testsuite/ChangeLog

 2010-01-09  Alexandre Oliva  <aoliva@redhat.com>
 
+	PR debug/42629
+	* gcc.dg/pr42629.c: New.
+
+2010-01-09  Alexandre Oliva  <aoliva@redhat.com>
+
 	PR middle-end/42363
 	* gcc.dg/torture/pr42363.c: New.
 

gcc/testsuite/gcc.dg/pr42629.c

+/* This failed -fcompare-debug because register pressure computation
+   took debug insns into account.  */
+/* { dg-do compile } */
+/* { dg-options "-O1 -fsched-pressure -fschedule-insns -fcompare-debug" } */
+
+int lzo_adler32(int adler, char *buf)
+{
+  int s1 = adler;
+  int s2 = adler;
+  s1 += buf[0];
+  s2 += s1;
+  s1 += buf[1];
+  s2 += s1;
+  s1 += buf[2];
+  s2 += s1;
+  s1 += buf[3];
+  s2 += s1;
+  s1 += buf[4];
+  s2 += s1;
+  s1 += buf[5];
+  s2 += s1;
+  s1 += buf[6];
+  s2 += s1;
+  s1 += buf[7];
+  s2 += s1;
+  return (s2 << 16) + s1;
+}