30 lines
970 B
C
30 lines
970 B
C
/* $Id$ */
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/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* C O N S T A N T P R O P A G A T I O N */
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line_p unique_def(line_p use, bblock_p b, short *defnr_out);
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/* See if there is a unique explicit definition
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* of the variable used by 'use' that
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* reaches 'use'.
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*/
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bool value_known(line_p def, offset *val_out);
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/* See if the value stored by definition 'def'
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* is known statically (i.e. is a constant).
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*/
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void fold_const(line_p l, bblock_p b, offset val);
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/* Perform the substitutions required for
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* constant folding.
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*/
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bool is_use(line_p l);
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/* See if 'l' is a use of a variable.
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*/
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bool affected(line_p use, short v, line_p l);
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/* See if the variable referenced by 'use' may
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* be changed by instruction l, which is
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* either a cal, cai or an indirect assignment.
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*/
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