(expand_block_move): Don't do any block moves where we clobber fixed numbers of registers...

(expand_block_move): Don't do any block moves where we clobber fixed
numbers of registers, instead move just 1-8 bytes at a time.

From-SVN: r9884

gcc/config/rs6000/rs6000.c

@@ -687,7 +687,7 @@ expand_block_move (operands)
      then don't generate more than 8 loads.  */
   if (TARGET_STRING)
     {
-      if (bytes > 64)
+      if (bytes > 4*8)
 	return 0;
     }
   else if (!STRICT_ALIGNMENT)
@@ -706,6 +706,8 @@ expand_block_move (operands)
     {
       for ( ; bytes > 0; bytes -= move_bytes)
 	{
+#if 0
+	  /* XXX Don't move so many bytes right now, it causes the compiler to not bootstrap */
 	  if (bytes > 24		/* move up to 32 bytes at a time */
 	      && !fixed_regs[5]
 	      && !fixed_regs[6]
@@ -748,7 +750,9 @@ expand_block_move (operands)
 					    GEN_INT (move_bytes),
 					    align_rtx));
 	    }
-	  else if (bytes > 4 && !TARGET_64BIT)
+	  else
+#endif
+	    if (bytes > 4 && !TARGET_64BIT)
 	    {			/* move up to 8 bytes at a time */
 	      move_bytes = (bytes > 8) ? 8 : bytes;
 	      emit_insn (gen_movstrsi_2reg (dest_reg,