emit-rtl.c (gen_rtx_REG): Check that the PIC_OFFSET_TABLE_REGNUM is a fixed…

emit-rtl.c (gen_rtx_REG): Check that the PIC_OFFSET_TABLE_REGNUM is a fixed register before returning...

	* emit-rtl.c (gen_rtx_REG): Check that the PIC_OFFSET_TABLE_REGNUM
	is a fixed register before returning pic_offset_table_rtx.
	* loop.c (scan_loop): Don't hoist insns that set pic_offset_table_rtx
	when PIC_OFFSET_TABLE_REG_CALL_CLOBBERED is defined.

From-SVN: r49304

gcc/ChangeLog

+2002-01-28  John David Anglin  <dave@hiauly1.hia.nrc.ca>
+
+	* emit-rtl.c (gen_rtx_REG): Check that the PIC_OFFSET_TABLE_REGNUM
+	is a fixed register before returning pic_offset_table_rtx.
+	* loop.c (scan_loop): Don't hoist insns that set pic_offset_table_rtx
+	when PIC_OFFSET_TABLE_REG_CALL_CLOBBERED is defined.
+
 2002-01-28  Jason Merrill  <jason@redhat.com>
 
 	* dwarf2.h (enum dwarf_call_frame_info): Add other DWARF 3 codes.

gcc/emit-rtl.c

@@ -411,7 +411,8 @@ gen_rtx_REG (mode, regno)
       if (regno == RETURN_ADDRESS_POINTER_REGNUM)
 	return return_address_pointer_rtx;
 #endif
-      if (regno == PIC_OFFSET_TABLE_REGNUM)
+      if (regno == PIC_OFFSET_TABLE_REGNUM
+	  && fixed_regs[PIC_OFFSET_TABLE_REGNUM])
         return pic_offset_table_rtx;
       if (regno == STACK_POINTER_REGNUM)
 	return stack_pointer_rtx;

gcc/loop.c

@@ -762,6 +762,9 @@ scan_loop (loop, flags)
       if (GET_CODE (p) == INSN
 	  && (set = single_set (p))
 	  && GET_CODE (SET_DEST (set)) == REG
+#ifdef PIC_OFFSET_TABLE_REG_CALL_CLOBBERED
+	  && SET_DEST (set) != pic_offset_table_rtx
+#endif
 	  && ! regs->array[REGNO (SET_DEST (set))].may_not_optimize)
 	{
 	  int tem1 = 0;