From: Richard Henderson <rth@redhat.com>
Date: Fri, 27 Sep 2002 01:13:28 +0000 (-0700)
Subject: sched-deps.c (sched_analyze_insn): Make clobber insns depend on call insns.
X-Git-Tag: releases/gcc-3.2.1~241
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=555b7a72343c4702515031ebf3b98735729e5a83;p=thirdparty%2Fgcc.git

sched-deps.c (sched_analyze_insn): Make clobber insns depend on call insns.

        * sched-deps.c (sched_analyze_insn): Make clobber insns depend
        on call insns.

From-SVN: r57568
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a644fa8bf3cd..7dd1e5acddc7 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2002-09-26  Richard Henderson  <rth@redhat.com>
+
+	PR c/7160
+	* sched-deps.c (sched_analyze_insn): Make clobber insns depend
+	on call insns.
+
 2002-09-27  Alan Modra  <amodra@bigpond.net.au>
 
 	* doloop.c (doloop_modify_runtime <biv skips initial incr>): Adjust
diff --git a/gcc/sched-deps.c b/gcc/sched-deps.c
index f2f64d39669b..4e14ee26eaaa 100644
--- a/gcc/sched-deps.c
+++ b/gcc/sched-deps.c
@@ -923,7 +923,15 @@ sched_analyze_insn (deps, x, insn, loop_notes)
       code = GET_CODE (x);
     }
   if (code == SET || code == CLOBBER)
-    sched_analyze_1 (deps, x, insn);
+    {
+      sched_analyze_1 (deps, x, insn);
+
+      /* Bare clobber insns are used for letting life analysis, reg-stack
+	 and others know that a value is dead.  Depend on the last call
+	 instruction so that reg-stack won't get confused.  */
+      if (code == CLOBBER)
+	add_dependence_list (insn, deps->last_function_call, REG_DEP_OUTPUT);
+    }
   else if (code == PARALLEL)
     {
       int i;