re PR middle-end/33794 (Wrong code w/ -ffast-math)

	PR middle-end/33794
	* reg-stack.c (move_for_stack_reg): Swap input argument of
	UNSPEC_TAN insn to the top of the stack.

From-SVN: r129406

gcc/ChangeLog

 2007-10-17  Uros Bizjak  <ubizjak@gmail.com>
 
+	PR middle-end/33794
+	* reg-stack.c (move_for_stack_reg): Swap input argument of
+	UNSPEC_TAN insn to the top of the stack.
+
+2007-10-17  Uros Bizjak  <ubizjak@gmail.com>
+
 	PR target/32961
 	* config/i386/i386.c (ix86_expand_builtin) [IX86_BUILTIN_PSLLWI128,
 	IX86_BUILTIN_PSLLDI128, BUILTIN_PSLLQI128, IX86_BUILTIN_PSRAWI128,

gcc/reg-stack.c

@@ -1085,11 +1085,13 @@ move_for_stack_reg (rtx insn, stack regstack, rtx pat)
 	 special case with i387 UNSPEC_TAN, where destination is live
 	 (an argument to fptan) but inherent load of 1.0 is modelled
 	 as a load from a constant.  */
-      if (! (GET_CODE (pat) == PARALLEL
-	     && XVECLEN (pat, 0) == 2
-	     && GET_CODE (XVECEXP (pat, 0, 1)) == SET
-	     && GET_CODE (SET_SRC (XVECEXP (pat, 0, 1))) == UNSPEC
-	     && XINT (SET_SRC (XVECEXP (pat, 0, 1)), 1) == UNSPEC_TAN))
+      if (GET_CODE (pat) == PARALLEL
+	  && XVECLEN (pat, 0) == 2
+	  && GET_CODE (XVECEXP (pat, 0, 1)) == SET
+	  && GET_CODE (SET_SRC (XVECEXP (pat, 0, 1))) == UNSPEC
+	  && XINT (SET_SRC (XVECEXP (pat, 0, 1)), 1) == UNSPEC_TAN)
+	emit_swap_insn (insn, regstack, dest);
+      else
 	gcc_assert (get_hard_regnum (regstack, dest) < FIRST_STACK_REG);
 
       gcc_assert (regstack->top < REG_STACK_SIZE);