From: Jim Wilson <wilson@gcc.gnu.org>
Date: Thu, 12 Aug 1993 17:45:15 +0000 (-0700)
Subject: (sched_analyze_insn): Handle USE before a JUMP_INSN just
X-Git-Tag: misc/cutover-egcs-0~8802
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=46aea93218b08e77f247b597c3dc779e294b77cb;p=thirdparty%2Fgcc.git

(sched_analyze_insn): Handle USE before a JUMP_INSN just
like a USE before a CALL_INSN.

From-SVN: r5141
---

diff --git a/gcc/sched.c b/gcc/sched.c
index 48b13ff3c1c1..c02d349192c5 100644
--- a/gcc/sched.c
+++ b/gcc/sched.c
@@ -1963,14 +1963,21 @@ sched_analyze_insn (x, insn)
   else
     sched_analyze_2 (x, insn);
 
-  /* Handle function calls.  */
-  if (GET_CODE (insn) == CALL_INSN)
+  /* Handle function calls and function returns created by the epilogue
+     threading code.  */
+  if (GET_CODE (insn) == CALL_INSN || GET_CODE (insn) == JUMP_INSN)
     {
       rtx dep_insn;
       rtx prev_dep_insn;
 
       /* When scheduling instructions, we make sure calls don't lose their
-	 accompanying USE insns by depending them one on another in order.   */
+	 accompanying USE insns by depending them one on another in order.
+
+	 Also, we must do the same thing for returns created by the epilogue
+	 threading code.  Note this code works only in this special case,
+	 because other passes make no guarantee that they will never emit
+	 an instruction between a USE and a RETURN.  There is such a guarantee
+	 for USE instructions immediately before a call.  */
 
       prev_dep_insn = insn;
       dep_insn = PREV_INSN (insn);