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Degenerate virtual PHIs can break DSEs fragile heuristic as to what defs it can handle for further processing. The following enhances it to look through degenerate PHIs by means of a worklist, processing the degenerate PHI defs uses to the defs array. The rewrite of virtuals into loop-closed SSA caused this to issue appear more often. The patch itself is mostly re-indenting the new loop body. PR tree-optimization/106293 * tree-ssa-dse.cc (dse_classify_store): Use a worklist to process degenerate PHI defs. * gcc.dg/tree-ssa/ssa-dse-46.c: New testcase. |
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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.