+1999-12-15 Mark Mitchell <mark@codesourcery.com>
+
+ * builtins.c (expand_builtin_mathfn): Make sure not to expand the
+ argument more than once.
+
1999-12-15 Jason Merrill <jason@casey.cygnus.com>
* stmt.c (expand_decl): Expand upper bound of a dynamic array.
&& TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
{
exp = copy_node (exp);
- arglist = copy_node (arglist);
TREE_OPERAND (exp, 1) = arglist;
+ /* Wrap the computation of the argument in a SAVE_EXPR. That
+ way, if we need to expand the argument again (as in the
+ flag_errno_math case below where we cannot directly set
+ errno), we will not perform side-effects more than once.
+ Note that here we're mutating the original EXP as well as the
+ copy; that's the right thing to do in case the original EXP
+ is expanded later. */
TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
+ arglist = copy_node (arglist);
}
op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);