2009-03-04 Richard Guenther <rguenther@suse.de>

[pf3gnuchains/gcc-fork.git] / gcc / tree.def

diff --git a/gcc/tree.def b/gcc/tree.def
index 3e077cc..c675812 100644 (file)
--- a/gcc/tree.def
+++ b/gcc/tree.def
@@ -1,7 +1,7 @@
 /* This file contains the definitions and documentation for the
    tree codes used in GCC.
    Copyright (C) 1987, 1988, 1993, 1995, 1997, 1998, 2000, 2001, 2004, 2005, 
-   2006, 2007, 2008 Free Software Foundation, Inc.
+   2006, 2007, 2008, 2009 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -691,7 +691,13 @@ DEFTREECODE (ABS_EXPR, "abs_expr", tcc_unary, 1)
    The second operand is the number of bits to
    shift by; it need not be the same type as the first operand and result.
    Note that the result is undefined if the second operand is larger
-   than or equal to the first operand's type size.  */
+   than or equal to the first operand's type size.
+
+   The first operand of a shift can have either an integer or a
+   (non-integer) fixed-point type.  We follow the ISO/IEC TR 18037:2004
+   semantics for the latter.
+
+   Rotates are defined for integer types only.  */
 DEFTREECODE (LSHIFT_EXPR, "lshift_expr", tcc_binary, 2)
 DEFTREECODE (RSHIFT_EXPR, "rshift_expr", tcc_binary, 2)
 DEFTREECODE (LROTATE_EXPR, "lrotate_expr", tcc_binary, 2)