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When the object size estimate is returned for a PHI node, it is the maximum possible value, which is fine in isolation. When combined with negative offsets however, it may sometimes end up in zero size because the resultant size was larger than the wholesize, leading size_for_offset to conclude that there's a potential underflow. Fix this by allowing a non-strict mode to size_for_offset, which conservatively returns the size (or wholesize) in case of a negative offset. gcc/ChangeLog: PR tree-optimization/117355 * tree-object-size.cc (size_for_offset): New argument STRICT, return SZ if it is set to false. (plus_stmt_object_size): Adjust call to SIZE_FOR_OFFSET. gcc/testsuite/ChangeLog: PR tree-optimization/117355 * g++.dg/ext/builtin-object-size2.C (test9): New test. (main): Call it. * gcc.dg/builtin-object-size-3.c (test10): Adjust expected size. Signed-off-by: Siddhesh Poyarekar <siddhesh@gotplt.org> |
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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.