265d817b1e
v5 update as comments: 1. Move const_rhs out of loop; 2. Iterate from int size for read_mode. This patch could optimize(works for char/short/int/void*): 6: r119:TI=[r118:DI+0x10] 7: [r118:DI]=r119:TI 8: r121:DI=[r118:DI+0x8] => 6: r119:TI=[r118:DI+0x10] 16: r122:DI=r119:TI#8 Final ASM will be as below without partial load after full store(stxv+ld): ld 10,16(3) mr 9,3 ld 3,24(3) std 10,0(9) std 3,8(9) blr It could achieve ~25% performance improvement for typical cases on Power9. Bootstrap and regression tested on Power9-LE. For AArch64, one ldr is replaced by mov with this patch: ldp x2, x3, [x0, 16] stp x2, x3, [x0] ldr x0, [x0, 8] => mov x1, x0 ldp x2, x0, [x0, 16] stp x2, x0, [x1] gcc/ChangeLog: 2020-08-04 Xionghu Luo <luoxhu@linux.ibm.com> PR rtl-optimization/71309 * dse.c (find_shift_sequence): Use subreg of shifted from high part register to avoid loading from address. gcc/testsuite/ChangeLog: 2020-08-04 Xionghu Luo <luoxhu@linux.ibm.com> PR rtl-optimization/71309 * gcc.target/powerpc/pr71309.c: New test. |
||
|---|---|---|
| config | ||
| contrib | ||
| fixincludes | ||
| gcc | ||
| gnattools | ||
| gotools | ||
| include | ||
| INSTALL | ||
| intl | ||
| libada | ||
| libatomic | ||
| libbacktrace | ||
| libcc1 | ||
| libcpp | ||
| libdecnumber | ||
| libffi | ||
| libgcc | ||
| libgfortran | ||
| libgo | ||
| libgomp | ||
| libhsail-rt | ||
| libiberty | ||
| libitm | ||
| libobjc | ||
| liboffloadmic | ||
| libphobos | ||
| libquadmath | ||
| libsanitizer | ||
| libssp | ||
| libstdc++-v3 | ||
| libvtv | ||
| lto-plugin | ||
| maintainer-scripts | ||
| zlib | ||
| .dir-locals.el | ||
| .gitattributes | ||
| .gitignore | ||
| ABOUT-NLS | ||
| ar-lib | ||
| ChangeLog | ||
| ChangeLog.jit | ||
| ChangeLog.tree-ssa | ||
| compile | ||
| config-ml.in | ||
| config.guess | ||
| config.rpath | ||
| config.sub | ||
| configure | ||
| configure.ac | ||
| COPYING | ||
| COPYING.LIB | ||
| COPYING.RUNTIME | ||
| COPYING3 | ||
| COPYING3.LIB | ||
| depcomp | ||
| install-sh | ||
| libtool-ldflags | ||
| libtool.m4 | ||
| ltgcc.m4 | ||
| ltmain.sh | ||
| ltoptions.m4 | ||
| ltsugar.m4 | ||
| ltversion.m4 | ||
| lt~obsolete.m4 | ||
| MAINTAINERS | ||
| Makefile.def | ||
| Makefile.in | ||
| Makefile.tpl | ||
| missing | ||
| mkdep | ||
| mkinstalldirs | ||
| move-if-change | ||
| multilib.am | ||
| README | ||
| symlink-tree | ||
| test-driver | ||
| ylwrap | ||
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.