re PR rtl-optimization/33148 (ICE in trunc_int_for_mode, at explow.c:56 during combine)

	PR rtl-optimization/33148
	* simplify-rtx.c (simplify_unary_operation_1): Only optimize
	(neg (lt X 0)) if X has scalar int mode.

	* gcc.c-torture/compile/20070827-1.c: New test.

From-SVN: r127855

gcc/ChangeLog

 2007-08-28  Jakub Jelinek  <jakub@redhat.com>
 
+	PR rtl-optimization/33148
+	* simplify-rtx.c (simplify_unary_operation_1): Only optimize
+	(neg (lt X 0)) if X has scalar int mode.
+
 	PR debug/32914
 	* dwarf2out.c (rtl_for_decl_init): If vector decl has CONSTRUCTOR
 	initializer, use build_vector_from_ctor if possible to create

gcc/simplify-rtx.c

@@ -583,7 +583,8 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op)
       /* (neg (lt x 0)) is (ashiftrt X C) if STORE_FLAG_VALUE is 1.  */
       /* (neg (lt x 0)) is (lshiftrt X C) if STORE_FLAG_VALUE is -1.  */
       if (GET_CODE (op) == LT
-	  && XEXP (op, 1) == const0_rtx)
+	  && XEXP (op, 1) == const0_rtx
+	  && SCALAR_INT_MODE_P (GET_MODE (XEXP (op, 0))))
 	{
 	  enum machine_mode inner = GET_MODE (XEXP (op, 0));
 	  int isize = GET_MODE_BITSIZE (inner);

gcc/testsuite/ChangeLog

 2007-08-28  Jakub Jelinek  <jakub@redhat.com>
 
+	PR rtl-optimization/33148
+	* gcc.c-torture/compile/20070827-1.c: New test.
+
 	PR debug/32914
 	* d++.dg/debug/const3.C: New test.
 	* d++.dg/debug/const4.C: New test.

gcc/testsuite/gcc.c-torture/compile/20070827-1.c

+/* PR rtl-optimization/33148 */
+
+int
+foo (unsigned int *p, int *q, unsigned int w, unsigned int b)
+{
+  unsigned int i;
+  int mask;
+
+  if (q[0] < q[1])
+    mask = 0xff;
+  else
+    mask = 0;
+
+  for (i = 0; 8 * i < w; i++)
+    {
+      b ^= mask;
+      *p++ = b;
+    }
+  return 0;
+}