combine.c (if_then_else_cond): Be careful about what kinds of RTL expressions…

combine.c (if_then_else_cond): Be careful about what kinds of RTL expressions are passed to operand_subword.

	* combine.c (if_then_else_cond): Be careful about what kinds
	of RTL expressions are passed to operand_subword.

From-SVN: r31383

gcc/ChangeLog

 Wed Jan 12 22:34:00 2000  Jeffrey A Law  (law@cygnus.com)
 
+	* combine.c (if_then_else_cond): Be careful about what kinds
+	of RTL expressions are passed to operand_subword.
+
 	* flow.c (split_edge): If we have to insert a new jump, make
 	sure to associate it with a basic block.
 

gcc/combine.c

@@ -7216,7 +7216,10 @@ if_then_else_cond (x, ptrue, pfalse)
 	   && 0 != (cond0 = if_then_else_cond (SUBREG_REG (x),
 					       &true0, &false0)))
     {
-      if (GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) > UNITS_PER_WORD
+      if ((GET_CODE (SUBREG_REG (x)) == REG
+	   || GET_CODE (SUBREG_REG (x)) == MEM
+	   || CONSTANT_P (SUBREG_REG (x)))
+	  && GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) > UNITS_PER_WORD
 	  && (WORDS_BIG_ENDIAN || SUBREG_WORD (x) != 0))
 	{
 	  true0 = operand_subword (true0, SUBREG_WORD (x), 0, mode);