re PR tree-optimization/14638 (Variables disappear from debug info at -O1)

re PR tree-optimization/14638 (Variables disappear from debug info at -O1)

2004-12-24  Daniel Berlin  <dberlin@dberlin.org>

	Fix PR debug/14638

	* tree.h (DECL_DEBUG_ALIAS_OF): New macro.
	* var-tracking.c (track_expr_p): Don't disqualify tracking of variables
	that are aliases of variables we want to track, unless the
	original variable is also ignored for debugging purposes.
	(VARIABLE_HASH_VAL): Use DECL_UID, so that this is deterministic.
 	* tree-outof-ssa.c (create_temp): Note who we are a debug alias of.
	* dwarf2out.c (dwarf2out_var_location): Add us to the location of
	the decl we are an alias of.

From-SVN: r92585