From a6f7ba1798530b13d702814433761bf392e84796 Mon Sep 17 00:00:00 2001
From: Jeffrey A Law <law@cygnus.com>
Date: Sat, 25 Oct 1997 18:16:50 +0000
Subject: [PATCH] mn10300.h (TARGET_SWITCHES): Add -mmult-bug and
 -mno-mult-bug.

        * mn10300.h (TARGET_SWITCHES): Add -mmult-bug and -mno-mult-bug.
        (TARGET_MULT_BUG): Define.
        (TARGET_DEFAULT): Default to TARGET_MULT_BUG.
        * mn10300.md (mulsi3): Handle TARGET_MULT_BUG.

From-SVN: r16173
---
 gcc/ChangeLog                 | 7 +++++++
 gcc/config/mn10300/mn10300.h  | 8 ++++++--
 gcc/config/mn10300/mn10300.md | 8 +++++++-
 3 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index d26d46476a8..2abf40892de 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+Sat Oct 25 12:20:58 1997  Jeffrey A Law  (law@cygnus.com)
+
+	* mn10300.h (TARGET_SWITCHES): Add -mmult-bug and -mno-mult-bug.
+	(TARGET_MULT_BUG): Define.
+	(TARGET_DEFAULT): Default to TARGET_MULT_BUG.
+	* mn10300.md (mulsi3): Handle TARGET_MULT_BUG.
+
 Fri Oct 24 17:40:34 1997  Jeffrey A Law  (law@cygnus.com)
 
 	* mn10200.c (indirect_memory_operand): Delete unused function.
diff --git a/gcc/config/mn10300/mn10300.h b/gcc/config/mn10300/mn10300.h
index 32016067b2e..4c32b8dfd6a 100644
--- a/gcc/config/mn10300/mn10300.h
+++ b/gcc/config/mn10300/mn10300.h
@@ -49,11 +49,15 @@ extern struct rtx_def *zero_areg;
    where VALUE is the bits to set or minus the bits to clear.
    An empty string NAME is used to identify the default VALUE.  */
 
+/* Generate code to work around mul/mulq bugs on the mn10300.  */
+#define TARGET_MULT_BUG			(target_flags & 0x1)
 #define TARGET_SWITCHES  \
-  {{ "", TARGET_DEFAULT}}
+  {{ "mult-bug",	0x1},	\
+   { "no-mult-bug", 	-0x1},	\
+   { "", TARGET_DEFAULT}}
 
 #ifndef TARGET_DEFAULT
-#define TARGET_DEFAULT 0
+#define TARGET_DEFAULT 0x1
 #endif
 
 /* Print subsidiary information on the compiler version in use.  */
diff --git a/gcc/config/mn10300/mn10300.md b/gcc/config/mn10300/mn10300.md
index c9e7d336d2f..f023478fe14 100644
--- a/gcc/config/mn10300/mn10300.md
+++ b/gcc/config/mn10300/mn10300.md
@@ -730,7 +730,13 @@
 	(mult:SI (match_operand:SI 1 "register_operand" "%0")
 		 (match_operand:SI 2 "register_operand" "d")))]
   ""
-  "mul %2,%0"
+  "*
+{
+  if (TARGET_MULT_BUG)
+    return \"nop\;nop\;mul %2,%0\";
+  else
+    return \"mul %2,%0\";
+}"
   [(set_attr "cc" "set_zn")])
 
 (define_insn "udivmodsi4"
-- 
2.30.2