From: Richard Henderson <rth@cygnus.com>
Date: Wed, 17 Dec 1997 15:07:39 +0000 (-0800)
Subject: sparc.md (jump): Don't use the annul bit around an empty loop.
X-Git-Tag: releases/libf2c-0.5.21~333
X-Git-Url: https://gcc.gnu.org/git/?a=commitdiff_plain;h=8dcb529511c71f818cf107964ce568b521dcb025;p=gcc.git

sparc.md (jump): Don't use the annul bit around an empty loop.

* sparc.md (jump): Don't use the annul bit around an empty loop.
Patch from Kevin.Kelly@East.Sun.COM.

From-SVN: r17124
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 1ffe005be4df..a7279290faf3 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+Wed Dec 17 15:06:04 1997  Richard Henderson  <rth@cygnus.com>
+
+	* sparc.md (jump): Don't use the annul bit around an empty loop.
+	Patch from Kevin.Kelly@East.Sun.COM.
+
 Wed Dec 17 00:51:36 1997  Stan Cox (scox@cygnus.com)
 
 	* jump.c: (optimize_jump): Don't use the return register as a 
diff --git a/gcc/config/sparc/sparc.md b/gcc/config/sparc/sparc.md
index 8ec12f5197a3..8b235fb2e493 100644
--- a/gcc/config/sparc/sparc.md
+++ b/gcc/config/sparc/sparc.md
@@ -5014,7 +5014,21 @@
 (define_insn "jump"
   [(set (pc) (label_ref (match_operand 0 "" "")))]
   ""
-  "b%* %l0%("
+  "*
+{
+  /* Some implementations are reported to have problems with
+	foo: b,a foo
+     i.e. an empty loop with the annul bit set.  The workaround is to use 
+        foo: b foo; nop
+     instead.  */
+
+  if (flag_delayed_branch
+      && (insn_addresses[INSN_UID (operands[0])]
+	  == insn_addresses[INSN_UID (insn)]))
+    return \"b %l0%#\";
+  else
+    return \"b%* %l0%(\";
+}"
   [(set_attr "type" "uncond_branch")])
 
 (define_expand "tablejump"