https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94103
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot
gnu.org
Status|NEW |ASSIGNED
Known to work| |10.0
--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
commit 1dc00a8ec9aeba86b74b16bff6f171824bb7b4a1 (HEAD -> master, origin/master,
origin/HEAD)
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.
