mirror of
git://gcc.gnu.org/git/gcc.git
synced 2025-04-01 18:00:38 +08:00
173b818d9c
* tree-ssa-ccp.c (latticevalue): Add UNKNOWN_VAL. (substitute_and_fold): Propigate into VUSE operands when possible. (visit_phi_node): Handle UNKNOWN_VAL latticevalue. (cp_lattice_meet): Handle merging of latticevalues when UNKNOWN_VAL is present. (visit_stmt): Visit assignments with V_MUST_DEFs. (visit_assignment): Gather ccp information for V_MUST_DEF operands. (ccp_fold): Deal with RHS' that are constant and virtual. (evaluate_stmt): Handle UNKNOWN_VAL likely values. (dump_lattice_value): Dump UNKNOWN_VAL latticevalues. (initialize): Mark statements with V_MUST_DEFs as VARYING only if the V_MUST_DEF operand is VARYING. Fix comment and include VOPS when computing immediate uses. (set_lattice_value): Disallow a UNKNOWN_VAL->UNDEFINED state transition. (replace_vuse_in): New function. (likely_value): Add check of vuse operands. (get_default_value): Set the default value of virtually defined variables to UKNOWN_VAL instead of VARYING. testsuite: * gcc.dg/tree-ssa/20040721-1.c: New test. From-SVN: r85055
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the file COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs.html for how to report bugs usefully.