entered into RCS

From-SVN: r1481

gcc/config/i386/i386.h

@@ -37,6 +37,20 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 #define I386 1
 
+/* Stubs for half-pic support if not OSF/1 reference platform.  */
+
+#ifndef HALF_PIC_P
+#define HALF_PIC_P() 0
+#define HALF_PIC_NUMBER_PTRS 0
+#define HALF_PIC_NUMBER_REFS 0
+#define HALF_PIC_ENCODE(DECL)
+#define HALF_PIC_DECLARE(NAME)
+#define HALF_PIC_INIT()	error ("half-pic init called on systems that don't support it.")
+#define HALF_PIC_ADDRESS_P(X) 0
+#define HALF_PIC_PTR(X) X
+#define HALF_PIC_FINISH(STREAM)
+#endif
+
 /* Run-time compilation parameters selecting different hardware subsets.  */
 
 extern int target_flags;
@@ -86,8 +100,13 @@ extern int target_flags;
     { "nosvr3-shlib", -040},			\
     { "ieee-fp", 0100},				\
     { "noieee-fp", -0100},			\
+    SUBTARGET_SWITCHES                          \
     { "", TARGET_DEFAULT}}
 
+/* This is meant to be redefined in the host dependent files */
+#define SUBTARGET_SWITCHES
+
+
 /* target machine storage layout */
 
 /* Define this if most significant byte of a word is the lowest numbered.  */

gcc/config/i386/i386.md

@@ -572,6 +572,18 @@
 
   if (flag_pic && SYMBOLIC_CONST (operands[1]))
     emit_pic_move (operands, SImode);
+  else if (HALF_PIC_P()
+	   && GET_CODE (operands[0]) == REG
+           && GET_CODE (operands[1]) == SYMBOL_REF
+           && HALF_PIC_ADDRESS_P (operands[1]))
+    {
+      rtx ptr = HALF_PIC_PTR (operands[1]);
+      if (XSTR (ptr, 0) != XSTR (operands[1], 0))
+	{
+	  emit_move_insn (operands[0], gen_rtx (MEM, Pmode, ptr));
+	  DONE;
+	}
+    }
 }")
 
 ;; On i486, incl reg is faster than movl $1,reg.