i386.c (ix86_decompose_address): Verify the base is a REG before trying to…

i386.c (ix86_decompose_address): Verify the base is a REG before trying to examine its register number.

        * i386.c (ix86_decompose_address): Verify the base is a REG
        before trying to examine its register number.

From-SVN: r30536

gcc/ChangeLog

 Sun Nov 14 23:11:05 1999  Jeffrey A Law  (law@cygnus.com)
 
+	* i386.c (ix86_decompose_address): Verify the base is a REG
+	before trying to examine its register number.
+
 	* basic-block.h: Remove all #defines and prototypes related to
 	integer lists.
 	(free_bb_mem, compute_preds_succs): Remove prototype.

gcc/config/i386/i386.c

@@ -1828,6 +1828,7 @@ ix86_decompose_address (addr, out)
      Avoid this by transforming to [%esi+0].  */
   if (ix86_cpu == PROCESSOR_K6 && !optimize_size
       && base && !index && !disp
+      && REG_P (base)
       && REGNO_REG_CLASS (REGNO (base)) == SIREG)
     disp = const0_rtx;