From: Bernd Schmidt <bernds@redhat.co.uk>
Date: Fri, 12 Jan 2001 16:33:07 +0000 (+0000)
Subject: Avoid scheduling set of frame pointer across other insns
X-Git-Tag: prereleases/gcc-2.95.3-test2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9173f5bea61c3fe5fc5bdd68168e459b56142604;p=thirdparty%2Fgcc.git

Avoid scheduling set of frame pointer across other insns

From-SVN: r38945
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a67412aec5a0..9c84b0974f89 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2001-01-12  Bernd Schmidt  <bernds@redhat.co.uk>
+
+	* expr.c (expand_builtin_setjmp_receiver): Emit a scheduling barrier
+	as last insn.
+
 2001-01-11  Bernd Schmidt  <bernds@redhat.co.uk>
 
 	* version.c: Bump.
diff --git a/gcc/expr.c b/gcc/expr.c
index 3624f77b2337..6499e6bc8ff8 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -8664,6 +8664,13 @@ expand_builtin_setjmp_receiver (receiver_label)
       {
 	; /* Nothing */
       }
+
+  /* @@@ This is a kludge.  Not all machine descriptions define a blockage
+     insn, but we must not allow the code we just generated to be reordered
+     by scheduling.  Specifically, the update of the frame pointer must
+     happen immediately, not later.  So emit an ASM_INPUT to act as blockage
+     insn.  */
+  emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
 }