mirror of
git://gcc.gnu.org/git/gcc.git
synced 2025-04-06 08:00:27 +08:00
695be09234
Jeff Law tells me h8300-elf fails gcc.c-torture/compile/pr49029.c with -O2 -g -mint32 -mh. This patch fixes it. The problem is that strict low part handling in cselib_record_sets assumes src_elt is not NULL. That src_elt is taken from a strict low part set, but it won't always have a src_elt to begin with. In this case, it's because src is a volatile MEM; we don't record values for those. Although we could fix the problem by testing for a NULL src_elt before creating the zero extends corresponding to strict low part sets of formerly const0_rtx REGs, there's no point in recording the additional set that we won't be able to use anyway. We could still record that the whole register has a zero-extend of the value stored in the narrower-mode strict low part of the register, but is that of any use? I guess not, but if we find otherwise, we can change that later. for gcc/ChangeLog * cselib.c (cselib_record_sets): Skip strict low part sets with NULL src_elt. From-SVN: r266873
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.