GCC modified for the FreeChainXenon project
39cac7c314
The first in-tree use of RTL-SSA was fwprop, and one of the goals was to make the fwprop rewrite preserve the old behaviour as far as possible. The switch to RTL-SSA was supposed to be a pure infrastructure change. So RTL-SSA has various FIXMEs for things that were artifically limited to faciliate the old-fwprop vs. new-fwprop comparison. One of the things that fwprop wants to do is extend live ranges, and function_info::make_use_available tried to keep within the cases that old fwprop could handle. Since the information is built in extended basic blocks, it's easy to handle intra-EBB queries directly. This patch does that, and removes the associated FIXME. To get a flavour for how much difference this makes, I tried compiling the testsuite at -Os for at least one target per supported CPU and OS. For most targets, only a handful of tests changed, but the vast majority of changes were positive. The only target that seemed to benefit significantly was i686-apple-darwin. The main point of the patch is to remove the FIXME and to enable the upcoming post-RA late-combine pass to handle more cases. gcc/ * rtl-ssa/functions.h (function_info::remains_available_at_insn): New member function. * rtl-ssa/accesses.cc (function_info::remains_available_at_insn): Likewise. (function_info::make_use_available): Avoid false negatives for queries within an EBB. |
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| c++tools | ||
| config | ||
| contrib | ||
| fixincludes | ||
| gcc | ||
| gnattools | ||
| gotools | ||
| include | ||
| INSTALL | ||
| intl | ||
| libada | ||
| libatomic | ||
| libbacktrace | ||
| libcc1 | ||
| libcody | ||
| libcpp | ||
| libdecnumber | ||
| libffi | ||
| libgcc | ||
| libgfortran | ||
| libgm2 | ||
| libgo | ||
| libgomp | ||
| libiberty | ||
| libitm | ||
| libobjc | ||
| libphobos | ||
| libquadmath | ||
| libsanitizer | ||
| libssp | ||
| libstdc++-v3 | ||
| libvtv | ||
| lto-plugin | ||
| maintainer-scripts | ||
| zlib | ||
| .dir-locals.el | ||
| .gitattributes | ||
| .gitignore | ||
| ABOUT-NLS | ||
| ar-lib | ||
| ChangeLog | ||
| ChangeLog.jit | ||
| ChangeLog.tree-ssa | ||
| compile | ||
| config-ml.in | ||
| config.guess | ||
| config.rpath | ||
| config.sub | ||
| configure | ||
| configure.ac | ||
| COPYING | ||
| COPYING.LIB | ||
| COPYING.RUNTIME | ||
| COPYING3 | ||
| COPYING3.LIB | ||
| depcomp | ||
| install-sh | ||
| libtool-ldflags | ||
| libtool.m4 | ||
| ltgcc.m4 | ||
| ltmain.sh | ||
| ltoptions.m4 | ||
| ltsugar.m4 | ||
| ltversion.m4 | ||
| lt~obsolete.m4 | ||
| MAINTAINERS | ||
| Makefile.def | ||
| Makefile.in | ||
| Makefile.tpl | ||
| missing | ||
| mkdep | ||
| mkinstalldirs | ||
| move-if-change | ||
| multilib.am | ||
| README | ||
| SECURITY.txt | ||
| symlink-tree | ||
| test-driver | ||
| ylwrap | ||
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.