re PR middle-end/11984 (ICE with -ffast_math: expected integer_cst, have real_cst)

	PR middle-end/11984
	* fold-const.c (fold <PLUS_EXPR>): Check for integer constant
	operands before calling tree_int_cst_lt when performing associative
	transformations.

	* gcc.dg/20030820-1.c: New test case.

From-SVN: r70618

gcc/ChangeLog

+2003-08-20  Roger Sayle  <roger@eyesopen.com>
+
+	PR middle-end/11984
+	* fold-const.c (fold <PLUS_EXPR>): Check for integer constant
+	operands before calling tree_int_cst_lt when performing associative
+	transformations.
+
 2003-08-20  Jason Merrill  <jason@redhat.com>
 
 	* tree.h (IS_EXPR_CODE_CLASS): Also include 'r' and 's'.

gcc/fold-const.c

@@ -5884,7 +5884,9 @@ fold (tree expr)
 		 example: ((X*2 + 4) - 8U)/2.  */
 	      if (minus_lit0 && lit0)
 		{
-		  if (tree_int_cst_lt (lit0, minus_lit0))
+		  if (TREE_CODE (lit0) == INTEGER_CST
+		      && TREE_CODE (minus_lit0) == INTEGER_CST
+		      && tree_int_cst_lt (lit0, minus_lit0))
 		    {
 		      minus_lit0 = associate_trees (minus_lit0, lit0,
 						    MINUS_EXPR, type);

gcc/testsuite/ChangeLog

+2003-08-20  Roger Sayle  <roger@eyesopen.com>
+
+	PR middle-end/11984
+	* gcc.dg/20030820-1.c: New test case.
+
 2003-08-20  Nathan Sidwell  <nathan@codesourcery.com>
 
 	PR c++/11945

gcc/testsuite/gcc.dg/20030820-1.c

+/* PR middle-end/11984 */
+/* The following program used to ICE in fold because we didn't check
+   whether the constants we were reassociating were integer constants
+   before calling tree_int_cst_lt.  */
+
+/* { dg-do compile } */
+/* { dg-options "-O2 -ffast-math" } */
+
+double f(double x)
+{
+  return 1.0 - x - 0.1;
+}
+