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When predicating a load we implicitly assume that the else value is zero. This matters in case the loaded value is padded (like e.g. a Bool) and we must ensure that the padding bytes are zero on targets that don't implicitly zero inactive elements. A former version of this patch still had this handling in ifcvt but the latest version defers it to the vectorizer. gcc/ChangeLog: * tree-if-conv.cc (predicate_load_or_store): Add zero else operand and comment. |
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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.