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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug testsuite/107338] new test case gcc.dg/vect/vect-bitfield-read-7.c in r13-3413-ge10ca9544632db fails Date: Tue, 25 Oct 2022 05:20:10 +0000 [thread overview] Message-ID: <bug-107338-4-ZSH0G4gMBs@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-107338-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107338 --- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Kewen Lin <linkw@gcc.gnu.org>: https://gcc.gnu.org/g:958014f369c8817184af110f8eb2c433a712fd0a commit r13-3474-g958014f369c8817184af110f8eb2c433a712fd0a Author: Kewen Lin <linkw@linux.ibm.com> Date: Tue Oct 25 00:18:08 2022 -0500 vect: Fix wrong shift_n after widening on BE [PR107338] As PR107338 shows, with the use of widening loads, the container_type can become a wider type, it causes us to get wrong shift_n since the BIT_FIELD_REF offset actually becomes bigger on BE. Taking the case in PR107338 as example, at the beginning the container type is short and BIT_FIELD_REF offset is 8 and size is 4, with unpacking to wider type int, the high 16 bits are zero, by viewing it as type int, its offset actually becomes to 24. So the shift_n should be 4 (32 - 24 - 4) instead of 20 (32 - 8 - 4). I noticed that if we move shift_n calculation early before the adjustments for widening loads (container type change), it's based on all the stuffs of the original container, the shfit_n calculated there is exactly what we want, it can be independent of widening. Besides, I add prec adjustment together with the current adjustments for widening loads, although prec's subsequent uses don't require this change for now, since the container type gets changed, we should keep the corresponding prec consistent. PR tree-optimization/107338 gcc/ChangeLog: * tree-vect-patterns.cc (vect_recog_bitfield_ref_pattern): Move shfit_n calculation before the adjustments for widening loads.
next prev parent reply other threads:[~2022-10-25 5:20 UTC|newest] Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-10-20 21:58 [Bug other/107338] New: " seurer at gcc dot gnu.org 2022-10-20 22:05 ` [Bug other/107338] " pinskia at gcc dot gnu.org 2022-10-21 9:42 ` [Bug testsuite/107338] " linkw at gcc dot gnu.org 2022-10-21 10:59 ` avieira at gcc dot gnu.org 2022-10-21 13:04 ` linkw at gcc dot gnu.org 2022-10-25 5:20 ` cvs-commit at gcc dot gnu.org [this message] 2022-10-25 5:29 ` [Bug tree-optimization/107338] " linkw at gcc dot gnu.org
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