Initial revision

util/ego/sr/sr_expr.h

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+/* S T R E N G T H   R E D U C T I O N 
+ *
+ * S R _ E X P R . H
+ *
+ */
+
+extern bool is_ivexpr();/* (line_p l; lset ivs,vars; line_p *lbegin; iv_p *iv;
+			 *	int *out_sign)
+			 * Try to recognize an expression that is a linear
+			 * function of presicely one induction variable.
+			 * It may only use loop constants (besides the
+			 * induc. var.).
+			 */