tree.def, [...]: Correctly document restrictions on the shift width.

2004-12-14  Tobias Schlueter  <tobias.schlueter@physik.uni-muenchen.de>

* tree.def, doc/c-tree.texi: Correctly document restrictions on the
shift width.

From-SVN: r92145

gcc/doc/c-tree.texi

@@ -2011,7 +2011,7 @@ shift.  Right shift should be treated as arithmetic, i.e., the
 high-order bits should be zero-filled when the expression has unsigned
 type and filled with the sign bit when the expression has signed type.
 Note that the result is undefined if the second operand is larger
-than the first operand's type size.
+than or equal to the first operand's type size.
 
 
 @item BIT_IOR_EXPR

gcc/tree.def

@@ -630,7 +630,7 @@ 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 the first operand's type size.  */
+   than or equal to the first operand's type size.  */
 DEFTREECODE (LSHIFT_EXPR, "lshift_expr", tcc_binary, 2)
 DEFTREECODE (RSHIFT_EXPR, "rshift_expr", tcc_binary, 2)
 DEFTREECODE (LROTATE_EXPR, "lrotate_expr", tcc_binary, 2)