5b8b1522e0
This avoids the last_vuse optimization hindering redundant store elimination by always also recording the original VUSE that was in effect on the load. In stage3 gcc/*.o we have 3182752 times recorded a single entry and 903409 times two entries (that's ~20% overhead). With just recording a single entry the number of hashtable lookups done when walking the vuse->vdef links to find an earlier access is 28961618. When recording the second entry this makes us find that earlier for donwnstream redundant accesses, reducing the number of hashtable lookups to 25401052 (that's a ~10% reduction). 2021-09-27 Richard Biener <rguenther@suse.de> PR tree-optimization/100112 * tree-ssa-sccvn.c (visit_reference_op_load): Record the referece into the hashtable twice in case last_vuse is different from the original vuse on the stmt. * gcc.dg/tree-ssa/ssa-fre-95.c: New testcase. |
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| c++tools | ||
| config | ||
| contrib | ||
| fixincludes | ||
| gcc | ||
| gnattools | ||
| gotools | ||
| include | ||
| INSTALL | ||
| intl | ||
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| libffi | ||
| libgcc | ||
| libgfortran | ||
| libgo | ||
| libgomp | ||
| libiberty | ||
| libitm | ||
| libobjc | ||
| liboffloadmic | ||
| libphobos | ||
| libquadmath | ||
| libsanitizer | ||
| libssp | ||
| libstdc++-v3 | ||
| libvtv | ||
| lto-plugin | ||
| maintainer-scripts | ||
| zlib | ||
| .dir-locals.el | ||
| .gitattributes | ||
| .gitignore | ||
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| COPYING3.LIB | ||
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| depcomp | ||
| install-sh | ||
| libtool-ldflags | ||
| libtool.m4 | ||
| lt~obsolete.m4 | ||
| ltgcc.m4 | ||
| ltmain.sh | ||
| ltoptions.m4 | ||
| ltsugar.m4 | ||
| ltversion.m4 | ||
| MAINTAINERS | ||
| Makefile.def | ||
| Makefile.in | ||
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| missing | ||
| mkdep | ||
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| test-driver | ||
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