Bug 1925632

Summary:	aarch64: -ftree-vectorize generates wrong code with gcc 8 & 9
Product:	Red Hat Enterprise Linux 8	Reporter:	Jeremy Linton (ARM) <jlinton>
Component:	gcc	Assignee:	Marek Polacek <mpolacek>
gcc sub component:	system-version	QA Contact:	Alexandra Petlanová Hájková <ahajkova>
Status:	CLOSED ERRATA	Docs Contact:
Severity:	medium
Priority:	unspecified	CC:	ahajkova, fweimer, jakub, ohudlick
Version:	8.4	Keywords:	Bugfix, Triaged
Target Milestone:	rc	Flags:	pm-rhel: mirror+
Target Release:	8.0
Hardware:	aarch64
OS:	Linux
URL:	https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98949
Whiteboard:
Fixed In Version:	gcc-8.4.1-2.el8	Doc Type:	No Doc Update
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-09 19:35:43 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Jeremy Linton (ARM) 2021-02-05 18:25:06 UTC

Description of problem: There is a vectorization codegen problem in gcc8/9 on aarch64. This is a RHEL8 clone of the defect at https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98949


Version-Release number of selected component (if applicable): RHEL 8.x/gcc 8


How reproducible: 100% given the testcase at the above url


Steps to Reproduce:
1. build & run testcase for assertion

Not sure if I should open a DTS9 specific bug too...

Comment 4 Marek Polacek 2021-04-08 20:31:42 UTC

Unfortunately the patch (Comment 3) broke everything on aarch64, so I've reverted it.  But it should be brought as part of a wider rebase, tracked in bug 1946758.  Resetting DTM/ITM.

Comment 9 errata-xmlrpc 2021-11-09 19:35:43 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Low: gcc security and bug fix update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:4386

Comment 10 Red Hat Bugzilla 2023-11-16 04:25:12 UTC

The needinfo request[s] on this closed bug have been removed as they have been unresolved for 120 days