ack/util/ego/ud/ud_const.h

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1984-11-26 14:35:32 +00:00
/* C O N S T A N T P R O P A G A T I O N */
extern line_p unique_def(); /* ( line_p use; bblock_p b; short *defnr_out;)
* See if there is a unique explicit definition
* of the variable used by 'use' that
* reaches 'use'.
*/
extern bool value_known(); /* (line_p def; offset *val_out)
* See if the value stored by definition 'def'
* is known statically (i.e. is a constant).
*/
extern fold_const(); /* (line_p l; bblock_p b; offset val)
* Perform the substitutions required for
* constant folding.
*/
extern bool is_use(); /* (line_p l)
* See if 'l' is a use of a variable.
*/
extern bool affected(); /* (line_p use,l; short v)
* See if the variable referenced by 'use' may
* be changed by instruction l, which is
* either a cal, cai or an indirect assignment.
*/