[Bug tree-optimization/104162] [12/13 Regression] Missed CSE after lowering of &MEM[ptr_1 + CST]
cvs-commit at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Thu May 5 12:41:42 GMT 2022
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104162
--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:
https://gcc.gnu.org/g:ee1cb43bc76de800efa0ade687b0cd28e62a5f82
commit r13-137-gee1cb43bc76de800efa0ade687b0cd28e62a5f82
Author: Richard Biener <rguenther@suse.de>
Date: Wed Jan 26 15:34:54 2022 +0100
tree-optimization/104162 - CSE of &MEM[ptr].a[i] and ptr + CST
This adds the capability to value-numbering of treating complex
address expressions where the offset becomes invariant as equal
to a POINTER_PLUS_EXPR. This restores CSE that is now prevented
by early lowering of &MEM[ptr + CST] to a POINTER_PLUS_EXPR.
Unfortunately this regresses gcc.dg/asan/pr99673.c again, so
the testcase is adjusted accordingly.
2022-01-26 Richard Biener <rguenther@suse.de>
PR tree-optimization/104162
* tree-ssa-sccvn.cc (vn_reference_lookup): Handle
&MEM[_1 + 5].a[i] like a POINTER_PLUS_EXPR if the offset
becomes invariant.
(vn_reference_insert): Likewise.
* gcc.dg/tree-ssa/ssa-fre-99.c: New testcase.
* gcc.dg/asan/pr99673.c: Adjust.
More information about the Gcc-bugs
mailing list