From: Jeffrey A Law <law@cygnus.com>
Date: Sat, 29 Aug 1998 13:53:27 +0000 (+0000)
Subject: m68k.md (beq0_di): Generate correct (and more efficient) code when...
X-Git-Tag: prereleases/egcs-1.1-prerelease~9
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3daee5797dda022fe0f22610bd7964355eb23423;p=thirdparty%2Fgcc.git

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.
Fixes bug from m68k-netbsd folks.

From-SVN: r22081
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 1c4e804a6d74..afb7fcdf5db9 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+Sat Aug 29 14:48:12 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.
+
 Sat Aug 29 12:38:54 1998  Jeffrey A Law  (law@cygnus.com)
 
 	* NEWS: Various updates.
diff --git a/gcc/config/m68k/m68k.md b/gcc/config/m68k/m68k.md
index de3c84625faa..4abcdeb80f4d 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