[Bug tree-optimization/96075] [8/9 Regression] bogus alignment for negative step grouped access
cvs-commit at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Wed Dec 2 13:23:26 GMT 2020
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96075
--- Comment #12 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:
https://gcc.gnu.org/g:53d76fe758a3e8e0c1f049e75030278427a8fe5d
commit r9-9094-g53d76fe758a3e8e0c1f049e75030278427a8fe5d
Author: Richard Biener <rguenther@suse.de>
Date: Mon Jul 6 16:26:50 2020 +0200
tree-optimization/96075 - fix bogus misalignment calculation
This fixes bogus misalignment calculation for negative steps
since an assertion a previous comment indicated no longer holds:
/* DR_STEP(dr) is the same as -TYPE_SIZE of the scalar type,
otherwise we wouldn't be here. */
Thus the following replaces DR_STEP by -TYPE_SIZE.
2020-07-06 Richard Biener <rguenther@suse.de>
PR tree-optimization/96075
* tree-vect-data-refs.c (vect_compute_data_ref_alignment): Use
TYPE_SIZE_UNIT of the vector component type instead of DR_STEP
for the misalignment calculation for negative step.
* gcc.dg/vect/slp-46.c: New testcase.
(cherry picked from commit dccbf1e2a6e544f71b4a5795f0c79015db019fc3)
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