[Bug tree-optimization/23942] [4.1 Regression] loop problem / testcase takes very long time to compile

["cvs-commit at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2005-09-26 18:43 -------
Subject: Bug 23942

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	spop@gcc.gnu.org	2005-09-26 18:43:09

Modified files:
	gcc            : ChangeLog tree-scalar-evolution.c 

Log message:
	PR tree-optimization/23942
	* Makefile.in (SCEV_H): Depends on PARAMS_H.
	* tree-scalar-evolution.c: Include params.h.
	(t_bool): New enum.
	(follow_ssa_edge, follow_ssa_edge_in_rhs,
	follow_ssa_edge_in_condition_phi_branch,
	follow_ssa_edge_in_condition_phi, follow_ssa_edge_inner_loop_phi):
	Change return type to t_bool.  Use a parameter to limit the size of
	trees that are walked before stopping
	(analyze_evolution_in_loop): Initialize the limit to 0.
	(follow_ssa_edge): Give up by returning t_dont_know if the limit
	exceeds PARAM_SCEV_MAX_EXPR_SIZE.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.10025&r2=2.10026
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree-scalar-evolution.c.diff?cvsroot=gcc&r1=2.38&r2=2.39



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23942