From 30b237515d6ef7ec3a2b2c35337e31a88b95b94b Mon Sep 17 00:00:00 2001
From: Jeffrey A Law <law@cygnus.com>
Date: Sat, 29 Aug 1998 13:54:24 +0000
Subject: m68k.md (beq0_di): Generate correct (and more efficient) code when...

        * m68k.md (beq0_di): Generate correct (and more efficient) code when
        the clobbered operand overlaps with an input.
        (bne0_di): Similarly.

From-SVN: r22082
---
 gcc/ChangeLog           |  4 ++++
 gcc/config/m68k/m68k.md | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)

(limited to 'gcc')

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 4530c52..e363da4 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,9 @@
 Sat Aug 29 12:39:56 1998  Jeffrey A Law  (law@cygnus.com)
 
+        * m68k.md (beq0_di): Generate correct (and more efficient) code when
+        the clobbered operand overlaps with an input.
+        (bne0_di): Similarly.
+
 	* Makefile.in (INSTALL): Remove "--no-header" argument.
 
         * NEWS: Various updates.
diff --git a/gcc/config/m68k/m68k.md b/gcc/config/m68k/m68k.md
index de3c846..4abcdeb 100644
--- a/gcc/config/m68k/m68k.md
+++ b/gcc/config/m68k/m68k.md
@@ -5958,6 +5958,25 @@
     operands[3] = adj_offsettable_operand (operands[0], 4);
   if (! ADDRESS_REG_P (operands[0]))
     {
+      if (reg_overlap_mentioned_p (operands[2], operands[0]))
+	{
+	  if (reg_overlap_mentioned_p (operands[2], operands[3]))
+	    {
+#ifdef MOTOROLA
+	      return \"or%.l %0,%2\;jbeq %l1\";
+#else
+	      return \"or%.l %0,%2\;jeq %l1\";
+#endif
+	    }
+	  else
+	    {
+#ifdef MOTOROLA
+	      return \"or%.l %3,%2\;jbeq %l1\";
+#else
+	      return \"or%.l %3,%2\;jeq %l1\";
+#endif
+	    }
+	}
 #ifdef MOTOROLA
       return \"move%.l %0,%2\;or%.l %3,%2\;jbeq %l1\";
 #else
@@ -6019,6 +6038,25 @@
     operands[3] = adj_offsettable_operand (operands[0], 4);
   if (!ADDRESS_REG_P (operands[0]))
     {
+      if (reg_overlap_mentioned_p (operands[2], operands[0]))
+	{
+	  if (reg_overlap_mentioned_p (operands[2], operands[3]))
+	    {
+#ifdef MOTOROLA
+	      return \"or%.l %0,%2\;jbne %l1\";
+#else
+	      return \"or%.l %0,%2\;jne %l1\";
+#endif
+	    }
+	  else
+	    {
+#ifdef MOTOROLA
+	      return \"or%.l %3,%2\;jbne %l1\";
+#else
+	      return \"or%.l %3,%2\;jne %l1\";
+#endif
+	    }
+	}
 #ifdef MOTOROLA
       return \"move%.l %0,%2\;or%.l %3,%2\;jbne %l1\";
 #else
-- 
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