https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94103
--- Comment #17 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-9 branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:4b0b6303dde0c32d936926de45b54cfe508fa677 commit r9-8444-g4b0b6303dde0c32d936926de45b54cfe508fa677 Author: Richard Biener <rguent...@suse.de> Date: Thu Mar 12 14:18:35 2020 +0100 tree-optimization/94103 avoid CSE of loads with padding VN currently replaces a load of a 16 byte entity 128 bits of precision (TImode) with the result of a load of a 16 byte entity with 80 bits of mode precision (XFmode). That will go downhill since if the padding bits are not actually filled with memory contents those bits are missing. 2020-03-12 Richard Biener <rguent...@suse.de> PR tree-optimization/94103 * tree-ssa-sccvn.c (visit_reference_op_load): Avoid type punning when the mode precision is not sufficient. * gcc.target/i386/pr94103.c: New testcase.
