mirror of
git://gcc.gnu.org/git/gcc.git
synced 2025-04-06 03:10:30 +08:00
4c3b16f3c1
one of common remaining reasons for ICF to fail after loading in fuction body is mismatched type of automatic vairable. This is becuase compatible_types_p resorts to checking TYPE_MAIN_VARIANTS for euqivalence that prevents merging many TBAA compaitle cases. (And thus is also not reflected by the hash extended by alias sets of accesses.) Since in gimple automatic variables are just blocks of memory I think we should only check its size only. All accesses are matched when copmparing the actual loads/stores. I am not sure if we need to match types of other DECLs but I decided I can try to be safe here: for PARM_DECl/RESUILT_DECL we match them anyway to be sure that functions are ABI compatible. For CONST_DECL and readonly global VAR_DECLs they are matched when comparing their constructors. * ipa-icf-gimple.c (func_checker::compare_decl): Do not compare types of local variables.
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.