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c2d58f88c1
It became apparent that conditions could be combined that had deep SSA dependency trees, that might thus require moving lots of statements. Set a hard upper bound for now, hopefully to be replaced by a dynamically computed bound, based on probabilities and costs. Also reset flow sensitive info and avoid introducing undefined behavior when moving stmts from under guarding conditions. Finally, rework the preexisting reset of flow sensitive info and avoidance of undefined behavior to be done when needed on all affected inner blocks: reset flow info whenever enclosing conditions change, and avoid undefined behavior whenever enclosing conditions become laxer. for gcc/ChangeLog * tree-ssa-ifcombine.cc (ifcombine_rewrite_to_defined_overflow): New. (ifcombine_replace_cond): Reject conds that would require moving too many stmts. Reset flow sensitive info and avoid undefined behavior in moved stmts. Reset flow sensitive info in all inner blocks when the outer condition changes, and avoid undefined behavior whenever the outer condition becomes laxer, adapted and moved from... (pass_tree_ifcombine::execute): ... here. |
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| gcc | ||
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| include | ||
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| libphobos | ||
| libquadmath | ||
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| libssp | ||
| libstdc++-v3 | ||
| libvtv | ||
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| zlib | ||
| .b4-config | ||
| .dir-locals.el | ||
| .gitattributes | ||
| .gitignore | ||
| ABOUT-NLS | ||
| ar-lib | ||
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| ChangeLog.tree-ssa | ||
| compile | ||
| config-ml.in | ||
| config.guess | ||
| config.rpath | ||
| config.sub | ||
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| configure.ac | ||
| COPYING | ||
| COPYING3 | ||
| COPYING3.LIB | ||
| COPYING.LIB | ||
| COPYING.RUNTIME | ||
| depcomp | ||
| install-sh | ||
| libtool-ldflags | ||
| libtool.m4 | ||
| lt~obsolete.m4 | ||
| ltgcc.m4 | ||
| ltmain.sh | ||
| ltoptions.m4 | ||
| ltsugar.m4 | ||
| ltversion.m4 | ||
| MAINTAINERS | ||
| Makefile.def | ||
| Makefile.in | ||
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| multilib.am | ||
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| symlink-tree | ||
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This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with 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/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.